Κατασκευή Βάσης Δεδομένων Jobs

I have a MySQL database that needs a set of well-structured, performant SELECT statements built with precise Boolean logic. The goal is to retrieve complex, multi-condition result sets in a single call rather than piecing data together in application code. You will be working only on read operations—no inserts or updates—so efficiency and clarity of each query are critical. The tables are already indexed, but I welcome recommendations if you spot obvious improvements that would speed up AND / OR combinations, NOT clauses, nested conditions, or full-text searches. Once the queries are finished, I need a short explanation of the logic behind each one so future maintenance is straightforward. Deliverables I expect: • SQL files (or a single file) containing the final SELEC...

I’m looking for a reliable and motivated partner who can bring website and mobile app development projects from clients. I will take complete responsibility for the technical development and project delivery. What I Can Handle: Website Development Web Applications Mobile App Development Backend & API Integration Database Development Deployment & Maintenance Partnership Model: You bring the client/project → I handle the complete development → We share the project revenue/profit. I’m specifically looking for someone who has experience in client acquisition, sales, business development, or already has access to clients who need web or mobile development services. This can be a long-term partnership, with a mutually agreed percentage/share for every successfu...

Our main database is already running on PostgreSQL 13 (anything in the “12.x or higher” family), and I need an experienced DBA to step in and tighten two things: First, Database optimization. The work includes reviewing current configuration parameters, checking execution plans, tuning indexes, and suggesting any schema changes that will noticeably reduce latency under peak load. If extensions (pg_stat_statements, auto_explain, etc.) should be enabled or configuration values (shared_buffers, work_mem, effective_cache_size and friends) adjusted, please make those recommendations backed by data. Second, Backup and recovery. I want a clear, scripted process—preferably with pg_dump and/or a modern tool such as pgBackRest or Barman—that covers daily backups, point-in-t...

I need a comprehensive reporting sheet with an integrated database for our engineering team. The tool should capture the following data: - Performance metrics - Maintenance history - Incident reports Functionality requirements include: - Data entry and updates - Data analysis and reporting - Automated alerts and notifications Ideal skills and experience: - Database development - Data analysis - Experience in creating automated alerts and notifications systems Your solution should streamline our reporting process and enhance data accessibility.

We have existing AWS services that need to be migrated to Microsoft Azure and are looking for an experienced Azure professional to assist with the migration. The environment consists of one web application and one API, both of which receive a high volume of traffic and require a scalable, highly available Azure architecture.

I need a freelancer to build a database and accounting system. Key Requirements: - Store customer information - Invoice processing functionality - Integration with existing CRM system Ideal Skills and Experience: - Experience in database development - Proficiency in creating accounting systems - Familiarity with CRM integration Please provide examples of similar work done and your approach to this project.

I’m a complete beginner to data engineering and want a structured, guided path that quickly gets me comfortable with real-world workflows. My first priority is solid data modeling, but I’d like each concept tied directly to hands-on practice as well as the “why” behind it, so theory and application move together. The stack I need to master is SQL, dbt, Snowflake, and Fivetran. A typical session might start with designing a dimensional model, move into building that model in Snowflake, automate the ELT with Fivetran, and finish by transforming the data with dbt—all committed to Git so best practices stick from day one. I learn fastest by doing, so please be ready to: • Walk through short, focused explanations, then immediately switch to screen-sha...

I have a list of online sources that contain both narrative text and numeric figures, and I need every one of those details captured in a single, well-structured Excel workbook. The job begins with careful data entry: copy each text field, metric, date, or code exactly as it appears on the web page and paste (or import) it into the template I will provide. Because the information is mixed data—words and numbers side by side—consistent formatting, proper column alignment, and vigilant error-checking are essential. Once the raw information is entered, the spreadsheet has to become an analysis tool. Please set up the formulas that calculate totals, averages, and any other basic statistics we agree on, then create clear charts or graphs that visualise the key results. Think of it ...

Build & Deliver RTIQA v1 — Global Multi-Tenant EdTech Platform RTIQA is a large, long-term project aimed at building an impactful global EdTech SaaS platform combining: - School Management System (SIS) - Learning Management System (LMS) - Student Information Management - Parent Engagement - Secure Assessments and Academic Records - Certificates and Verification with Public Verification Pages - Notifications and Communication - Practical AI-Powered Educational Assistance Tools This is a full engineering challenge focused on delivering ONE complete and production-ready outcome. The successful freelancer or team will review the existing repositories, analyze the architecture, consolidate or refactor as necessary, and take RTIQA from its current work-in-progress state to a secure, ...

A fresh, accurate database of United-States–based B2B prospects is required to fuel an upcoming outreach campaign that spans every sector, from technology start-ups to healthcare providers, finance firms, manufacturers, and beyond. The file must include only business contacts; consumer data is out of scope. Each record needs both company fundamentals and a direct line to a key decision maker so that my sales team can move quickly from introduction to proposal. Deliverables • Clean, de-duplicated spreadsheet (Excel or CSV) • Mandatory fields per lead:  – Company name  – Full postal address or city/state  – Website or main phone  – Decision maker’s name & title (C-level or department head preferred) &emsp...

I need a web-based BISAK employer database to manage work placements and streamline communication between stakeholders. Key functionalities include: - Tracking work placements - Automating annual placement requests - Streamlining documentation - Facilitating parental communication - Creating a portal for staff, parents, students, and companies Ideal skills and experience: - Database development - Web application design - Experience with user authentication and role-based access - Familiarity with frontend and backend technologies - Strong organizational skills to ensure all functionalities are integrated smoothly Looking forward to a collaborative approach to build long-term employer relationships for our careers activities.

I am looking for a developer/team to build the following software: Platforms Required React Native mobile app – iOS + Android Responsive web application Backend/API Database Admin dashboard QR code system Payment/e-commerce integration Core Software Features User Accounts Email login Google/Apple login User profiles Password/account management Profile Management Create/edit profiles Text/content fields Photo uploads Video uploads Gallery Public/private visibility Family Tree Create people/nodes Add relationships Connect profiles Living + deceased people Interactive family tree Add/remove/edit relationships QR Code System Generate unique QR codes Link QR code to specific profile QR scanning Redirect to public profile Basic scan/view tracking Replace/deactivate QR codes User Permissio...

I already have Campus AI running with login, student profiles, attendance, a dashboard, and an AI chatbot. Its back end is modular and ready for more functionality. Now I want to grow the platform by adding three specific modules that plug smoothly into the existing codebase: • Grades & Assessment Management – instructors must be able to create assessments, enter marks, publish results, and let students track progress in real time. • Course Scheduling & Registration – students should browse offerings, build timetables, add/drop classes, and receive conflict alerts, while staff manage capacities and prerequisites. • Financial Aid & Tuition Payments – a place for award tracking, fee statements, secure online payment, and receipts, with role-b...

We are looking for a database developer/compiler who can help us develop and maintain our databases. The ideal candidate will have experience with both SQL and NoSQL databases, and will be able to write efficient and reliable code. They will also be able to work with our team to ensure that our databases are up-to-date and meet our needs.