Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

Hiring Java Developers on Freelancer.com gives you access to a global pool of talented professionals who can deliver high-quality solutions tailored to your needs. Our platform makes it easy and convenient to find, hire, and collaborate with skilled Java experts from around the world. So why wait? Bring your ideas to life by posting your own project and hiring a Java Developer on Freelancer.com today!

Από 243,909 αξιολογήσεις, οι πελάτες αξιολογούν τους Java Developers με 4.9 από 5 αστέρια
Πρόσλαβε Java Developers

Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

Hiring Java Developers on Freelancer.com gives you access to a global pool of talented professionals who can deliver high-quality solutions tailored to your needs. Our platform makes it easy and convenient to find, hire, and collaborate with skilled Java experts from around the world. So why wait? Bring your ideas to life by posting your own project and hiring a Java Developer on Freelancer.com today!

Από 243,909 αξιολογήσεις, οι πελάτες αξιολογούν τους Java Developers με 4.9 από 5 αστέρια
Πρόσλαβε Java Developers

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    Title Mobile app (iOS, Android) and web app with AI document processing: client documents to CSV Project description Consulting company needs an app where clients submit financial documents. AI reads them, sorts and arranges the data, and produces a CSV file that imports into our software. The app runs on iOS, Android and the web from a single codebase. How it works App (iOS, Android, web) Welcome screen with our logo and a greeting Start button Upload screens for each document type: bank statements, ID, payslips and cash statements. Users can take a photo or choose a file (images and PDFs). Backend The app sends files to our server over HTTPS. The server stores the files in Google Drive, with one folder per client. An AI step reads the pictures and PDFs, extracts the data, and arr...

    €1232 Average bid
    €1232 Μέση Προσφορά
    116 προσφορές

    I’ve been assigned a tricky maintenance ticket in our Spring MVC / Spring Boot code-base and, as someone still ramping up on Java, I’m stuck tracking down logical errors that sit squarely in the service layer—the part where our business logic lives. The symptoms: data flows in correctly from the controllers and persists fine through the repositories, yet the results returned to the UI are wrong. Unit tests covering the affected services either fail or pass with unexpected values, so I need a fresh pair of expert eyes to walk through the code with me, isolate the faulty branches, and refactor or rewrite the logic so every scenario behaves as intended. What I’ll provide • I can share my screen and follow the steps suggested by you. I can’t provide yo...

    €3 / hr Average bid
    €3 / hr Μέση Προσφορά
    7 προσφορές

    I’ve been assigned a tricky maintenance ticket in our Spring MVC / Spring Boot code-base and, as someone still ramping up on Java, I’m stuck tracking down logical errors that sit squarely in the service layer—the part where our business logic lives. The symptoms: data flows in correctly from the controllers and persists fine through the repositories, yet the results returned to the UI are wrong. Unit tests covering the affected services either fail or pass with unexpected values, so I need a fresh pair of expert eyes to walk through the code with me, isolate the faulty branches, and refactor or rewrite the logic so every scenario behaves as intended. What I’ll provide • I can share my screen and follow the steps suggested by you. I can’t provide yo...

    €2 / hr Average bid
    €2 / hr Μέση Προσφορά
    5 προσφορές

    I want to bring a Five-Nights-at-Freddy’s atmosphere to Roblox while keeping the core gameplay firmly incremental. Players will start small and, through steady progression, unlock systems, rooms, and mechanics until they are running a fully functioning facility—all inside a tense, animatronic-haunted setting. The project’s main goal is simple: deliver a full, working game that feels just as satisfying to grow as it is unsettling to survive. Gameplay type: incremental Primary focus: building the entire experience from the ground up rather than just a single mechanic Mode: multiplayer—data must replicate correctly across servers, and progress must save between sessions. You’ll work in Roblox Studio with Lua, creating everything from resource generators and...

    €316 Average bid
    €316 Μέση Προσφορά
    61 προσφορές

    I need an expert who can handle software development, data analysis, and product enhancement. Requirements: - Develop new software solutions - Analyze complex data sets - Enhance existing products for better performance Ideal skills and experience: - Proven track record in software development - Strong data analysis skills - Experience in product enhancement Please include in your application: - Past work Showcase: - Similar projects in your portfolio

    €273 Average bid
    €273 Μέση Προσφορά
    163 προσφορές
    Nimay12345
    6 μέρες left

    I need an NLP workflow that ingests social media posts, customer reviews, and email messages, then detects the dominant emotion—Happy, Sad, or Angry—in each piece of text. The solution should be reliable enough for daily, automated processing and simple to retrain as my data grows. I already have raw text stored in CSV files; you can assume each record contains a unique ID and a text field. Your job is to: • Clean and normalise the text (language is English only). • Build or fine-tune a model that classifies the emotion with high accuracy. • Expose the results through a concise report (precision, recall, F1) and a small demo script or notebook that shows end-to-end usage. Python, spaCy, Hugging Face, or similar libraries are welcome—as long as the fi...

    €8 / hr Average bid
    €8 / hr Μέση Προσφορά
    35 προσφορές
    Aplikasi Desktop Pribadi
    6 μέρες left

    Saya mencari bantuan untuk merancang dan membangun sebuah program desktop yang akan saya gunakan secara pribadi. Jenis proyek ini memang berfokus pada “Program” dengan target platform “Desktop”, jadi aplikasi harus dapat dijalankan mulus di Windows tanpa bergantung pada layanan web eksternal. Ruang lingkup awal: • Kembangkan aplikasi desktop mandiri lengkap dengan installer atau panduan pemasangan. • Gunakan bahasa atau framework yang Anda kuasai—Electron, .NET (C# WPF atau WinForms), Java / JavaFX, atau alternatif setara—selama performanya stabil. • Struktur kode harus bersih, terdokumentasi, dan mudah saya kembangkan lebih lanjut. • Sertakan dokumentasi ringkas tentang cara menggunakan, membangun, dan memperbarui aplikasi. ...

    €12 / hr Average bid
    €12 / hr Μέση Προσφορά
    19 προσφορές

    **Project Title: WhatsApp Cloud API Broadcast to APK Download Conversion Optimization** I am looking for an experienced WhatsApp Cloud API and APK distribution specialist who can help me improve my APK download conversion rate. **My Current Setup:** * WhatsApp Cloud API with approved message templates. * Approximately 2,000 broadcast messages per campaign. * An HTTPS landing page containing an APK download link. * Current results: approximately 10–20 downloads per 2,000 messages. * My target is to improve the number of genuine downloads significantly. **What I Need From You:** 1. Analyze my existing WhatsApp template, landing page, and APK download flow. 2. Identify the reasons for low download conversion. 3. Recommend the best compliant method for distributing APK files or down...

    €75 Average bid
    €75 Μέση Προσφορά
    41 προσφορές
    AWS Banking POC Build
    5 μέρες left
    Βεβαιωμένο

    I need an AWS specialist to spin up a small but realistic proof-of-concept for a banking-style web application. The goal is to show that the core of an online-banking platform can be deployed quickly and cleanly on AWS infrastructure. Scope • Primary focus: application deployment for a Banking POC. • Must include interactive elements that feel native in the browser. • The front-end should talk to back-end APIs exposed through API Gateway and backed by AWS Lambda functions. Deliverables 1. Source code for the UI and Lambdas in a Git repository. 2. Infrastructure-as-code (CloudFormation or Terraform) that builds the full stack in my account. 3. README with step-by-step deployment and test instructions. 4. A short walkthrough video or screenshare session confirm...

    €24 Average bid
    €24 Μέση Προσφορά
    53 προσφορές

    Looking for an experienced Full Stack Developer to build a secure digital passport platform for diamonds. Many diamond owners lose or misplace important documents related to valuable stones, including grading certificates, purchase records, insurance documents, appraisals, and ownership history. The goal is to create a secure platform where each diamond has its own digital profile and all related records can be stored, organized, verified, and shared when needed. Core features include: - Secure user accounts and diamond profiles - Document upload and storage - AI-assisted extraction of information from certificates and records - Structured diamond data and ownership history - Certificate and document verification workflows - Search and dashboard functionality - Secure sharing of diamond...

    €3302 Average bid
    €3302 Μέση Προσφορά
    249 προσφορές

    I am looking for a skilled AI/ML and Data Science developer to help build or improve intelligent, data-driven applications and Python-based solutions. The project may involve: * Machine Learning and Deep Learning model development * Data Science, data cleaning, exploratory data analysis (EDA), and visualization * Predictive analytics, classification, and recommendation systems * NLP, chatbot development, and AI-powered customer support solutions * Generative AI application development and LLM-based solutions * Python development using FastAPI, Streamlit, and Gradio * Interactive dashboards, Plotly visualizations, and model performance evaluation * AI model integration, API development, and web application deployment I am particularly interested in practical projects with clear requireme...

    €212 Average bid
    €212 Μέση Προσφορά
    79 προσφορές

    Option 1: Data Entry & Excel Work Project Title: Experienced Data Entry Specialist Needed for Excel Spreadsheet Clean-up Project Description: I am looking for a detail-oriented freelancer to help with a data entry and organization project. Key Tasks: • Transferring data from PDF files/images into an organized Excel spreadsheet. • Cleaning up existing data, removing duplicates, and fixing formatting errors. • Verifying the accuracy of the entered data. Requirements: • Proven experience with MS Excel or Google Sheets. • High speed and accuracy in typing. • Strong attention to detail and ability to meet deadlines. Please share examples of similar data entry projects you have completed in the past. Option 2: Logo & Graphic Design Project Title: Creative...

    €8 / hr Average bid
    €8 / hr Μέση Προσφορά
    41 προσφορές

    I have weekly supermarket flyers in PDF form—around 40 pages each—containing product images, names, normal price, offer price, pack size/quantity, validity dates of the promotion and any additional information. I need an offline-first API that takes an uploaded PDF, scans every page and returns those fields together with a confidence score for each value. Extracted date - Product names, normal price, offer price, pack size/quantity, validity dates of the promotion, any additional information, and confidence score. Core requirements • Language: feel free to build in Python or Node.js or Java, whichever lets you reach higher accuracy and faster throughput. • Absolutely no external calls: the full pipeline (OCR, layout analysis, model inference) must work without i...

    €11 Average bid
    €11 Μέση Προσφορά
    58 προσφορές
    Android OS Repair Needed
    5 μέρες left

    My Android phone has stopped booting altogether—the operating system will not load past the splash screen—and I need it back in working order without losing my personal data. I am looking for a specialist who regularly handles deep-level Android software recovery, including tasks such as flashing or re-flashing stock or custom ROMs, repairing corrupted partitions, and dealing with boot-loop or soft-brick scenarios. Familiarity with ADB, Fastboot, OEM-specific tools (e.g., Odin or SP Flash Tool), and secure data-backup methods is essential so that any repair steps preserve photos, contacts, and app data wherever possible. Deliverables • A fully functional, booting device on the latest stable build appropriate to my model • Verification that core services (calls, S...

    €17 / hr Average bid
    €17 / hr Μέση Προσφορά
    70 προσφορές

    I’m putting together a data-processing pipeline that blends the strengths of Java and Python. The goal is simple: pull data from several sources, cleanse and transform it, perform lightweight analysis, and push the results downstream in a form that is easy for other services to consume. Whether the flow ends up running in real time, on a schedule, or as classic batch jobs is still open for discussion, so versatility with both approaches will be appreciated. You will design and code the core pipeline components, set up automated tests, and leave behind clear documentation so the in-house team can extend the work without a hitch. Modern tooling is expected—think Maven or Gradle for Java, virtualenv or Poetry for Python, Git for version control, and whatever lightweight orchestra...

    €29 / hr Average bid
    €29 / hr Μέση Προσφορά
    142 προσφορές

    I’m ready to move from concept to launch on a peer-to-peer marketplace devoted exclusively to trading iOS gaming accounts. The core idea is simple: sellers list their game credentials, buyers browse, pay through a protected escrow flow, and the account is transferred only after automated verification confirms the credentials are valid. Here’s the experience I need built: • Customer-facing app (web or native) with clean onboarding, game-specific listing fields, real-time chat, and multi-factor login • Seller dashboard for posting, editing, pausing, and deleting listings, plus a reputation system driven by completed trades • Escrow-based checkout that releases funds only when my back-end bot confirms ownership transfer (Stripe & Apple Pay support required...

    €264 Average bid
    €264 Μέση Προσφορά
    42 προσφορές

    I need a small Android utility that sits on my driver phone and instantly accepts every incoming ride request on the Ola platform without me having to touch the screen. The app’s one and only job is to detect the pop-up that Ola shows for a new ride, trigger “Accept” immediately, and then step out of the way so I can start navigation as usual. Core expectations • Runs on Android 8.0 and above, stays active in the background, and restarts automatically after a phone reboot. • Lets me toggle auto-accept on or off from a simple in-app switch or quick-settings tile. • Works with the current public version of the Ola driver app; if Ola updates its layout, the code should be written clearly enough that I (or a future freelancer) can adjust the detection ru...

    €2 / hr Average bid
    €2 / hr Μέση Προσφορά
    37 προσφορές

    I need a self-hosted identity-verification flow focused exclusively on U.S. driver’s licenses. The user journey is simple: they upload clear front-and-back images, your service analyses the images for authenticity (holograms, microprint, barcode consistency, etc.), extracts the data fields, and returns a verification status plus the parsed data in JSON. The core task is to build this as a RESTful service and wire it into my existing backend. I’m comfortable exposing webhooks or consuming your API from Node.js, Python, or Java, so pick the stack you work fastest in—as long as the integration points stay standard (HTTPS + JSON). Please rely on proven libraries or services for image analysis (e.g., OpenCV, AWS Rekognition, or any SDK you prefer) and keep everything packag...

    €231 Average bid
    €231 Μέση Προσφορά
    55 προσφορές
    Script Developer
    5 μέρες left
    Βεβαιωμένο

    Main Workstation: Wowonder script ( Provided the script files ) Design: Provided Google Gemini ( Send your email for access ) provided by the web and mobile application The selected developer will be responsible for taking the existing frontend code and integrating it with a robust backend. The core focus areas are: Design: Enhancement has been done using the new design, implementing the front-end as its. Sections enhancement: by adding the design enhancement on section would be for thus of empty functionality, the Stream, videos, collection, shorts, arcade, random cam as well the art shop Hashtag Concerts: each hashtag should be tracked by users, statistics as it shows it by the leaderboard Ads System: the ads of the site needs to be shown randomly between the content, users of boost sh...

    €888 Average bid
    €888 Μέση Προσφορά
    275 προσφορές

    For an existing business (production use, not a personal/practice project) I have a working salon appointment booking web application built with Spring MVC (XML config), JSP/JSTL, Bootstrap, MySQL, and deployed on Tomcat 9. It includes: A 277-item service catalog with search and live bill calculation Razorpay payment integration (full payment or advance, test mode currently) An owner dashboard to manage bookings WhatsApp booking confirmation . With an AI integration

    €240 Average bid
    €240 Μέση Προσφορά
    72 προσφορές
    Full-Stack Web Application Development
    4 μέρες left
    Βεβαιωμένο

    Beyond application development, I’ve had the opportunity to design, develop, and take responsibility for web platforms supporting international congresses and technical events. These experiences involved delivering production-ready solutions under real deadlines and collaborating with different stakeholders and technical teams. I’m particularly interested in opportunities involving: Full-Stack Web Application Development .NET / ASP.NET Core Development Spring Boot amp; Java Development API Development amp; System Integration React / Vue / Angular Applications SaaS Platforms amp; Business Applications Remote Engineering Teams Freelance and Long-Term Projects I’m looking to collaborate with international teams, startups, and companies where I can contribute tech...

    €24 Average bid
    €24 Μέση Προσφορά
    101 προσφορές

    This assignment centres on building and refining data-driven services in both Java and Python for the analysis layer of our internal platform at Niti Technologies India Software, Kharadi – Pune. The code you ship will ingest raw records, transform them through clean, well-tested business logic, then surface the results through REST endpoints that other teams consume. I already work with both stacks daily, so you will find an established Git workflow, CI pipeline, and SonarQube gating in place. Expect to pair with our QA group for manual and automated test coverage and to attend brief, on-site stand-ups; Pune-based contributors slip naturally into that rhythm, yet our processes are structured enough for fresh graduates to grow quickly. Deliverables • Modular Java 17 / Spr...

    €515 Average bid
    €515 Μέση Προσφορά
    89 προσφορές

    I’m looking for a seasoned Android developer to turn my app idea into a fully functioning product that can help me generate IDR 1 million in revenue. This is a pure software-development job focused on a mobile application, and for now I only need the Android build—future expansion to iOS can stay on the horizon once this first release proves itself. What I already have • A rough concept that centres on simple, repeat-use user flows aimed at driving micro-transactions and ad impressions. • Basic wireframes sketched in Figma. • A shortlist of reference apps that show the look-and-feel I want. What I need from you 1. Technical guidance to refine the feature set so it fits neatly within an MVP scope. 2. End-to-end Android development (Kotlin or Java, Andr...

    €17 / hr Average bid
    €17 / hr Μέση Προσφορά
    123 προσφορές

    I need an Android-only social networking application called “Shaamcadenuur.” The core idea is to let users connect, share updates, and interact in real time on a clean, modern interface that feels lightweight even on lower-end devices. Scope of work • Build the full Android application, starting from UX wireframes through to a signed APK and publish-ready bundle. • Implement the essential social features: user registration/login (email or phone), personal profile pages, a main feed for posts (text, photo, short video), likes/comments, and basic one-to-one messaging. • Structure the code so that future modules—such as group chats or advanced media stories—can plug in without a major rewrite. • Set up a simple, secure backend (Firebase, Su...

    €16 / hr Average bid
    €16 / hr Μέση Προσφορά
    217 προσφορές
    AI-Powered SaaS Audit Platform
    4 μέρες left
    Βεβαιωμένο

    Necesito levantar desde cero una plataforma SaaS B2B que automatice auditorías digitales complejas. La idea es que el sistema recopile datos a través de integraciones directas con herramientas de marketing digital, plataformas de análisis de datos y nuestros CRM, procese esos insumos con modelos de inteligencia artificial y expida, sin intervención humana, informes, hojas de cálculo y recomendaciones accionables. Planeo un desarrollo por fases que cubra backend, frontend, base de datos y todas las integraciones externas. Mi stack preferido para la lógica de servidor es Java, por lo que agradeceré experiencia sólida en ese ecosistema (por ejemplo Spring Boot, Quarkus o similares) y familiaridad con arquitecturas escalables orientadas ...

    €185 Average bid
    €185 Μέση Προσφορά
    147 προσφορές

    Mobile App Developer Required – Restaurant/Bar Software Integration I am looking for an experienced Android / Mobile App Developer for a Restaurant & Bar Management Software project. The main Windows-based software is currently under development. I am now looking for a mobile app specialist to discuss and estimate the development of two future applications: 1. Captain Pad App - Waiter login - Table selection - Order taking - KOT generation - Send orders to the main software - Table/running order status - Multiple waiter/user support 2. Owner Mobile Sync / View App - Running tables - Total sales - Item-wise sales - Basic business reports - Data synchronization with the main software The main software will have a database and will ne...

    €287 Average bid
    €287 Μέση Προσφορά
    121 προσφορές

    I’m actively acquiring enterprise-grade Python codebases that live on GitHub so my team can run deep engineering evaluations, AI performance benchmarking, and architecture analyses. If you have a mature repository you’re ready to transfer, tell me about it. How I value a project The final offer hinges on measurable attributes: overall architecture, code quality, test coverage, repository activity, documentation depth, and sheer size (modules, lines of code, dependency graph). More modular, well-documented, and recently maintained projects command higher pricing. What to send in your proposal • Public or private GitHub URL • Brief functional overview and primary domain (e.g., fintech API, data-science toolkit, dev-ops utility) • Approximate size: LOC or ...

    €977 Average bid
    €977 Μέση Προσφορά
    54 προσφορές

    I need a basic food delivery app called "Namma Ooru Food" for my local town. Budget: ₹10,000 maximum. Required: - Customer Android App - Restaurant/Hotel Panel - Delivery Boy Panel - Basic Admin Panel - Order Management - Cash on Delivery + UPI - Customer Address/Location - Order Notifications - App Name and Logo customization - APK + Source Code A ready-made or white-label solution is also acceptable. Please show a demo first and clearly tell me what features are included within ₹10,000. Please mention separately if there are any server, hosting or Play Store charges. Budget is strictly ₹10,000.

    €119 Average bid
    €119 Μέση Προσφορά
    81 προσφορές
    AI Products Tester Needed
    4 μέρες left
    Βεβαιωμένο

    We are building interconnected AI products spanning collaboration and project workspaces, AI assistants with persistent memory, document retrieval and search, and multilingual speech features. Products communicate through APIs, with authentication, permissions, and cross-product workflows being actively developed. We need testers who can understand an end-to-end workflow, investigate failures, and clearly explain what went wrong. This is an ongoing engagement for QA engineers. Requirements: Hands-on experience testing web applications and APIs Confidence using Postman, browser DevTools, JSON, and HTTP status codes Ability to distinguish a frontend issue from an API, authentication, or integration issue Clear written communication and independent investigation Comfort working with evolvi...

    €5 / hr Average bid
    €5 / hr Μέση Προσφορά
    180 προσφορές

    I'm looking for a skilled Roblox developer to create a Fantasy Survival game featuring mythical creatures. The game should include: - Resource Gathering: Players collect resources to survive. - Base Building: Players can build and customize their own bases. - Character Progression: Players level up and enhance their skills. The game world should be immersive and rich with mythical creatures. Ideal candidates should have: - Proven experience in Roblox game development. - Strong understanding of resource management and building mechanics. - Creativity in designing engaging mythical creature landscapes and narratives.

    €639 Average bid
    €639 Μέση Προσφορά
    90 προσφορές

    Project: Android APK Trojan Detection – Security Analysis and Resolution My released APK triggers “Trojan” alerts on some Xiaomi, OPPO, and vivo devices. I need an experienced Android security engineer to identify the root cause and help resolve the issue. The initial investigation should focus on potential security detection triggers, including suspicious code signatures, permissions, third-party libraries, and APK components. To the best of my knowledge, no third-party SDKs are included. However, the app requests both standard and sensitive permissions, which should also be examined. Scope of Work Phase 1 – Initial Security Analysis ($100–200) - Decompile and analyze the APK to identify potential detection triggers. - Investigate suspicious code, permissions...

    €883 Average bid
    €883 Μέση Προσφορά
    165 προσφορές
    Online teaching via anydesk with voice talk.
    4 μέρες left
    Βεβαιωμένο

    I need an experienced DevOps-minded tutor to sit with me over AnyDesk and guide me, step by step, through installing and configuring a self-hosted GitLab instance, placing it behind a secure Tailscale mesh, and preparing the same server for a small AI-coding proof of concept. The emphasis is on learning: you carry out each step while explaining what you are doing and why, so that I can repeat the process later on my own. We will start from a fresh VPS (or a local box if you think that is wiser). By the end of the session I expect: • The server hardened, updated, and reachable only online with anydesk • GitLab fully operational with one demo repository and a runner configured. • A minimal CI pipeline that executes a “hello-world” AI script using either PyTor...

    €19 / hr Average bid
    €19 / hr Μέση Προσφορά
    88 προσφορές

    BajriX is an active construction-materials marketplace running on React, React Native, Spring Boot, PostgreSQL and AWS. I need an experienced developer who can drop straight into the existing repository, understand the current architecture and take the lead on building out new features while keeping the codebase clean, modular and well-documented. Your day-to-day work will involve: Experience with e-commerce or marketplace logic, AWS authentication flows and third-party API integrations will make you especially effective here. When you reply, please link to past work that shows similar responsibilities—code samples, GitHub repos or live projects are all welcome. Also include your typical availability and expected charges so we can map out milestones right away. I’m ready...

    €78 Average bid
    €78 Μέση Προσφορά
    54 προσφορές
    JS Expert Needed for Chrome Extension
    3 μέρες left
    Βεβαιωμένο

    I’m looking for an experienced JavaScript developer who can create a script to detect which Chrome extensions are installed/enabled in a browser. The main task is to research and implement a reliable method for identifying installed Chrome extensions using JavaScript/browser-side techniques. Requirements: Strong JavaScript knowledge Good understanding of Chrome/browser security and APIs Experience with browser detection techniques Ability to research what is technically possible and find a reliable approach Please share any relevant experience or similar work you have done, along with your estimated cost and timeline.

    €358 Average bid
    €358 Μέση Προσφορά
    195 προσφορές

    The server needs a lightweight gameplay-enhancement plugin that introduces configurable custom abilities for players. Each ability should be triggerable by an item right-click, a command, or a passive effect, with individual cooldowns, particle/sound feedback, and permission control. All parameters—damage, range, mana cost, cooldown time, particles, messages—must be editable in a clean YAML file so I can expand the list without touching the code. Target platform: Paper / Spigot 1.20+ (no hard dependencies beyond the API). The finished JAR and full, well-commented source code are both required; I intend to compile and update the plugin myself later. Please keep performance in mind and avoid ticking tasks where possible. Acceptance criteria • /abilities reload command ho...

    €24 Average bid
    €24 Μέση Προσφορά
    61 προσφορές

    # Freelancing Requirement: COBOL Code Dataset We are looking for freelancers/vendors who can provide **authentic, human-written COBOL codebases** for AI training, evaluation, and research purposes. ### Data Requirements * **Programming Language:** COBOL * **Code Type:** Real-world, human-written COBOL source code * **Preferred:** Complete projects/codebases rather than isolated code snippets * Code should represent genuine software development work, preferably from enterprise, banking, finance, insurance, government, or other legacy systems. * Both **modern and legacy COBOL** codebases are acceptable. * Code may include supporting files and project-level documentation where available. ### Preferred File Types / Components Where available, we are interested in: * `.cob` / `.cbl` COBOL...

    €2872 Average bid
    €2872 Μέση Προσφορά
    17 προσφορές
    Long-Term Java/Angular Developer for Ongoing Support
    3 μέρες left
    Βεβαιωμένο

    We are looking for a freelance developer for ongoing support on an existing Java/Angular project. This is a long-term freelance engagement with flexible working hours. The project environment is already set up. Claude Code access and project-specific Claude Code skills/workflows are already available. Your main work will be: - Pick up assigned Jira tickets - Use Claude Code and existing project workflows to understand and implement tasks - Review and verify generated code changes - Make corrections where required - Run relevant tests and confirm the implementation works correctly - Create/update Git branches and pull requests - Resolve minor code or merge conflicts when needed - Keep Jira status updated - Log worked hours accurately Required knowledge: - Java / Spring Boot or Quarkus...

    €3 / hr Average bid
    €3 / hr Μέση Προσφορά
    76 προσφορές
    PingOne Advanced Identity Cloud Login Script Fix
    3 μέρες left
    Βεβαιωμένο

    I can not share the Java Script, I Would need someone to work with me over a Google Meet Or a Web Ex. I need a sharp set of eyes on the JavaScript embedded in one of my PingOne Advanced Identity Cloud customer journeys. The problem shows up only during the login process. Issue observed: • Authentication failures I will share the journey export and give you limited-time console access. Your job is to locate the fault in the script, patch it without breaking any existing steps, and demonstrate that a complete login now succeeds (standard username/password and any social connectors already configured). When you hand the work back, I expect: • The corrected JavaScript with clear inline comments • A brief change log explaining what was wrong and how you resolved it • E...

    €26 Average bid
    €26 Μέση Προσφορά
    137 προσφορές

    Project Description Looking for an Expert QA Automation Engineer / SDET – 10+ Years Experience We are looking for an experienced QA Automation Engineer / SDET with 10+ years of experience to provide guidance, support, and consultation on software testing and automation projects. The ideal candidate should have strong hands-on experience in UI Automation, API Testing, Mobile Automation, Database Testing, CI/CD, and Test Framework Development. Required Skills Selenium WebDriver Selenium with Java Selenium with C# XPath, CSS Selectors Page Object Model (POM) Data-driven & Hybrid frameworks Cross-browser testing Parallel execution Playwright Playwright with Java Playwright with TypeScript Playwright with JavaScript Locators, getByRole, getByText, getByTestId XPath & CSS Page Obje...

    €236 Average bid
    €236 Μέση Προσφορά
    45 προσφορές
    IoT / Mobile-Web Control Interface Engineer
    3 μέρες left
    Βεβαιωμένο

    IoT / Mobile-Web Control Interface Engineer IoT / Mobile-Web Interface Engineer - Smart Hardware Prototype Project Description: HappyMat(TM) is developing a smart interactive physical product incorporating embedded electronics, sensors, LED lighting, a digital display, Wi-Fi/Bluetooth connectivity, and other interactive features. We are seeking an IoT / Mobile-Web Control Interface Engineer to develop a simple control interface for HappyMat Prototype #1 and collaborate closely with our embedded/firmware engineer. Primary Responsibilities: • Develop a simple mobile-friendly or web-based control interface. • Communicate with the HappyMat embedded controller over the selected Wi-Fi/Bluetooth architecture. • Provide basic controls for applicable prototype functions. • C...

    €446 Average bid
    €446 Μέση Προσφορά
    283 προσφορές
    Ongoing Small Android Utility Apps
    3 μέρες left
    Βεβαιωμένο

    I’m looking for someone who enjoys building quick, lightweight Android utilities and can handle the entire cycle from coding to publishing on my Google Play Console. For the very first assignment I’d like “another small utility app” beyond the usual calculator or wallpaper examples—something simple yet useful that can be shipped fast and then refined as we collect user feedback. Here’s what I need each time we work together: • Clean, well-commented code in Java or Kotlin, built in Android Studio • AAB/APK ready for release plus the signed keystore or key management steps handled • Play Console assets prepared (screenshots, feature graphic, short description) and the app successfully published under my account • Basic after-lau...

    €24 Average bid
    €24 Μέση Προσφορά
    68 προσφορές

    I want a lightweight Android app that can read the live feed of 1xBet’s Crash game and forecast the crash point a few seconds before each round stops. Mobile is the only environment I need covered, so everything you build should install cleanly on recent Android versions without side-loading gymnastics. The core of the project is the prediction engine. Whether you choose pure probability modelling, machine-learning, or a hybrid approach, the algorithm must process real-time data from the game screen or API and return a single number—the expected multiplier at which the round will bust. A simple, distraction-free interface that shows the current round, your predicted crash point, a confidence score, and a quick history log is enough for version one; fancy charts can wait. You&...

    €18 / hr Average bid
    €18 / hr Μέση Προσφορά
    99 προσφορές

    I want to launch a feature-rich social media application built natively for Android. Because the focus is Android only, the entire UX should follow Google’s latest Material Design guidance and take advantage of Kotlin (or Java if you have a strong case). Core scope • Account creation, secure login and profile editing • Dynamic feed with posts, images, likes and comments in real time • Push notifications for follows, messages and activity • Basic in-app messaging (text and images) • Admin dashboard or simple backend panel for moderating content I’ll provide branding assets and the initial wireframes; you’ll translate them into a polished UI, develop the app, connect it to a scalable backend (Firebase or a RESTful service—happy to ...

    €268 Average bid
    €268 Μέση Προσφορά
    84 προσφορές

    I have a full-stack Java codebase that I need set up, walked through, and examined from top to bottom. My first priority is uncovering any security vulnerabilities or hidden backdoors, so you will need to comb through the entire stack—server-side, client-side, build scripts, and deployment configs—looking for risky patterns, outdated dependencies, or suspicious commits. Once the security sweep is complete, I also want your eye on execution speed. Any hotspots that slow response times, blocking calls, or inefficient algorithms should be flagged with clear, actionable fixes. You are welcome to profile locally or spin up a test environment; I’ll provide repo access and a clean VM image so you can reproduce the build. Deliverables • Written audit report that lists ev...

    €135 Average bid
    €135 Μέση Προσφορά
    128 προσφορές

    1. Flight Navigation & Operations Management - Real-time flight tracking for arrivals and departures. - Automated gate, terminal, and runway allocation algorithms. - Comprehensive air traffic schedule management. 2. Passenger Ticketing & Access Control - Passenger registration and automated ticket issuance system. - Baggage tracking and gate access control mechanisms. - Interactive user interfaces developed with Java GUI (Swing/JavaFX) following Event-Driven Programming principles. 3. Network Infrastructure & Security (Cisco Packet Tracer) - End-to-end Network Topology design simulating airport communications. - Advanced routing and switching configurations. - Implementation of Access Control Lists (ACLs) and firewall boundaries to isolate operational networks from public tra...

    €387 Average bid
    €387 Μέση Προσφορά
    151 προσφορές
    Android Cloud Postgres Data Viewer
    2 μέρες left
    Βεβαιωμένο

    I’m putting together an Android Studio app whose only job is to pull product records from a Postgres instance hosted on Google Cloud and show them in a clean, scrollable list. The data connection must run through Google’s Antigravity agent so the app stays lightweight and secure without shipping database credentials inside the APK. Here’s what I need from you: • A minimal yet solid Android Studio project (Kotlin or Java—your choice) that connects to the Postgres database via the Antigravity agent. • An async call that fetches product data—name, price, description, image URL are enough for a working demo—and maps it into a RecyclerView list. • Basic UI: toolbar with app name, RecyclerView list, placeholder images handled gracefully, a...

    €221 Average bid
    €221 Μέση Προσφορά
    138 προσφορές

    I need production-ready software that proves out the latest frontier-model capabilities from end to end. The work spans everything from designing the data layer to wiring up sleek UIs, then packaging and deploying so that real users can click around and see the model in action. You can reach for the stack that lets you move fastest—Python/Django or FastAPI, Java/Spring Boot, TypeScript/Node.js or , even Rust, C#, or modern C++. Cloud services (AWS, Azure, GCP) and containerisation with Docker/Kubernetes are welcome if they speed delivery; I’m flexible as long as the final result is easy to stand up and maintain. Frontier-model features sit at the heart of each build. Whether it’s natural-language understanding, computer-vision pipelines, data-driven recommendations, or ...

    €23 / hr Average bid
    €23 / hr Μέση Προσφορά
    90 προσφορές

    제가 즐기는 게임의 보스 컨텐츠는 파티 조합과 상황에 따라 점수가 크게 달라집니다. 이를 손쉽게 계산할 수 있도록 웹이든 데스크톱 프로그램이든 상관없이 ‘보스 점수 시뮬레이터’를 완전히 새로 만들어 주셨으면 합니다. 핵심 요구 사항 • 파티 구성, 장비, 버프 등 변수를 자유롭게 입력하면 최종 점수를 산출하고 최고점 갱신시 캐릭터별 배치 시뮬레이션으로 볼수있어야합니다. • 자체 계정 시스템 내장: 사용자가 화면에서 바로 계정을 만들고 로그인 가능 • 권한 구분 기능: 관리자-계정은 모든 메뉴 접근, 일반-계정은 점수 계산 메뉴만 접근 그리고 계정 권한 마다 접근가능한 메뉴 구별. • 직관적인 UI와 한글 인터페이스 • 소스코드·실행 파일(또는 배포 가능한 URL)·간단한 사용 설명서 제공 게임 업데이트시 마다 정보 갱신 가능 하여야 합니다. 이미 제가 원하는 기능을 가지고있는 사이트가 있습니다(외국인 제작) 같은 길드가 아니라서 일반 기능만 사용할수있고, 이런 시스템이 있어야 점수 갱신이 가능하여서 필요합니다 사이트 : << 참고 바랍니다. 똑같이 만들어주셔도 됩니다. 오직 게임 업데이트마다 (2주) 업데이트가 되어야 합니다. 예산은 일단 임의로 설정한것이고 추가 지불할 의사도 있습니다. 웹(React, Vue, Django 등) 또는 프로그램(C#, Java, Python 등) 중 편하신 환경으로 구현해 주시면 됩니다. 동작만 확실하면 사용 기술 스택은 ...

    €412 Average bid
    €412 Μέση Προσφορά
    68 προσφορές

    I’m gearing up to launch a brand-new Android app that lets my hardware-shop customers browse products, add items to a cart, and place orders straight from their phones. The focus is strictly on online sales and ordering—no inventory management module for now—so every screen should guide shoppers smoothly from discovery to secure checkout. Core flow I need: • Product catalogue with categories, search, photos, prices and live stock count pulled from our existing SQL database (REST/JSON endpoint is ready). • Cart, quantity edits and promo-code field. • Checkout supporting cash-on-delivery plus at least one standard payment gateway (Stripe or Razorpay is fine). • Order confirmation, push notification updates and a simple order-history screen. &bul...

    €267 Average bid
    €267 Μέση Προσφορά
    135 προσφορές

    I need a hands-off desktop solution that can open, play, and finish at least 1,000 video ads every day so the corresponding impressions are credited to my account. The software must run reliably on a standard personal computer; I’m flexible on the exact operating system as long as setup is straightforward and doesn’t require deep technical knowledge. Key points to keep in mind: • Only video ads are relevant—no banners or pop-ups. • Each view has to register as legitimate, so timing, user-agent rotation, and any other anti-bot countermeasures you implement are essential. • A simple dashboard or log file should let me verify how many ads were completed during a given session and flag any failures. • The program needs to cycle continuously for 24...

    €229 Average bid
    €229 Μέση Προσφορά
    33 προσφορές

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