Write web application requirements documentationεργασίες

...system using a rotary encoder. Quadrant Display: Implement a 4-LED display to indicate the quadrant of operation (motor or generator mode). Additional Features: Include Phase-Locked Loop (PLL) design for inverter grid connection. Code Quality: Clearly define all variables with descriptive names. Maintain a clear and organized code structure to facilitate future modifications and updates. Requirements: Proven experience with Arduino development, specifically Arduino DUE. Familiarity with motor controllers, specifically the IMC101T T038. Proficiency in implementing Space Vector PWM. Experience in developing user interfaces with LCD displays and RS232 communication. Knowledge of JSON and CRC for data integrity. Ability to design and implement PLL for inverter grid connection. E...

Upload application on google play console.

Develop a WeChat/Alipay app for a large-scale event in Hong Kong, you need to use it on WeChat/Alipay. It can be used by people in Hong Kong, Macau and China. The functions are mainly used to view event information, videos, reminder functions, mini games, contact customer service, and connect Department external website

...mobile application developer to integrate and implement the Tap payment gateway into my mobile application. The integration should be smooth and seamless, using the provided SDK and API keys. The primary goal is to ensure that the payment gateway functions properly and securely, without any errors, and provides a flawless user experience. Requirements: Proven experience in integrating payment gateways, preferably with Tap or similar services. Proficiency in the programming languages and frameworks used in my application (please specify if it's for Android, iOS, or a cross-platform framework). Strong understanding of API integration and handling secure data transactions. Ability to implement the payment gateway according to the documentation prov...

We are seeking an experienced developer to convert the SPM12 GUI interface, currently built on the MATLAB compiler, into a Python application. The source code for SPM12 is available at SPM12 GitHub repository Objectives: • Translate the entire SPM12 codebase from MATLAB to Python while maintaining functionality. • Develop a Python-based GUI that replicates the current MATLAB interface. • Ensure the converted application integrates well with Python scientific computing stacks. Key Deliverables: • A fully functional Python version of SPM12. • Source code with comments and documentation. • A user guide for the Python-based GUI. Skills Required: • Proficiency in MATLAB and Python programming languages. • Experience w...

I am seeking an experienced programmer, whose task will be to integrate the Trilliant Provid...programmer, whose task will be to integrate the Trilliant Provider Directory API into another system. Must have experience with Trilliant and Databricks. It's noteworthy that I am open to working with a freelancer proficient in any programming language. Ideal qualifications are: - A solid general programming background - Experience with API integration - Capable of interpreting and applying API documentation The API must deliver the following functionalities: - Ability to search providers - Retrieve provider details - Seamless integration with another system Freelancers who demonstrate evidence of past experience particularly in Trilliant / Databricks API integration will be hig...

Hello We are looking for a Google Play Console user who can help us with app upload. The ideal candidate should be familiar with the Google Play Console and have experience in uploading apps to the Google Play Store. The main responsibilities of this role include managing app listings, uploading Apps, and ensuring compliance with Google Play policies and guidelines. We are seeking someone who can efficiently navigate the Play Console interface, troubleshoot common issues, and optimize app metadata for better visibility. If you have a strong understanding of the app submission process and can deliver high-quality results, we would love to hear from you! Skills needed: - Google Play Console - App upload - APK management - Google Play policies - Troubleshooting - Responsible with work Look...

I'm in need of a skilled Web Application Developer to create a sales incentives system that will handle complex calculations and generate comprehensive reports. Essential Features: - Commission Percentage Calculation: The system should be able to calculate the commission based on the sales made. - Bonus Calculation: The application needs to compute bonuses based on the sales targets achieved. - Tiered Incentives: The system should offer tiered incentives based on the sales performance. Additional Requirements: - User-Friendly Interface: The application should have a simple, intuitive interface for easy usage. - Reporting: The system should generate detailed reports on the sales incentives calculations. - Security: It's crucial that the app...

Project Title: Basic Audio Note Organizer App (Working Title) Project Description: I need a web application developed to manage and organize short audio recordings. Users should be able to upload audio files (3 seconds max) and categorize them with basic labels. Key Features: User accounts and login system Ability to upload audio files (3 seconds max) - MP3 format preferred Option to add simple labels (e.g., "Meeting Notes," "Quote") to each audio file Ability to sort and filter audio files by upload date or label Basic interface for browsing and listening to uploaded audio files Secure storage of user data (audio files and labels) Target Audience: This app caters to users who want a simple way to organize and access short audio snippets for personal ...

... Objectives: 1. Assess the compatibility of Velociraptor with the Odroid N2+ hardware and ARM architecture. 2. Modify the Velociraptor source code for optimal performance on the Odroid N2+. 3. Ensure all Velociraptor functionalities are operational on the new platform. 4. Conduct thorough testing to ensure stability and performance. 5. Create documentation (a walk-through) for installing, configuring, and using Velociraptor on Odroid N2+, showing how it was done and how to use the installer (ie any prerequisites or tips to get Velociraptor working) Deliverables: 1. Modified Velociraptor source code compatible with Odroid N2+. 2. A detailed report on code changes and adaptations made for the ARM architecture. 3. Comprehensive testing reports,

Hello I am using an existing Godot addon for a 3D camera and it has great documentation and features. However i can't figure out how to configure it the way i would like it. It currently has a feature to move the camera once it hits the edge of the defined frame in the viewport. But i want it to move in the direction of the mouse position and stop once the player hits the edge of the frame in the viewport. I've attached a photo of the viewport frame feature that is already part of this camera addon. I just want the Camera to then follow the mouse position and only stop if the player is touching the edge of the viewport frame.

...innovative design and cultural heritage through interactive digital art. Requirements: -Proficiency in Blender for 3D modeling and animation, with a strong portfolio showcasing relevant work. -Experience in scripting within Blender to automate tasks and enhance animation functionalities. -Knowledge of integrating Blender projects with other software for interactive displays. - Demonstrated ability to work on projects that combine art and technology, particularly in public or large-scale settings. Deliverables: A series of high-quality anamorphic animations designed in Blender, ready for public display. A backend system for content management that facilitates easy updating and interaction handling. Comprehensive documentation on managing and updating the display cont...

I'm looking for a freelancer who's great at web scraping to help with a project involving a specific website initially, with potential for more. I'll give you the specific data fields to extract. It'd be great if you: Are really good at web scraping and or Python. Know your way around MS SQL Server databases, not essential but definately an advantage. Understand how to extract data effectively. Understand the need for security and captcha integration if needed. Can work quickly since this project is a priority and needs to be done ASAP. Ultimately, I want to be able to manage the code with your ongoing help, so this could lead to a long-term partnership. I'll share the full details when needed. You will provide source code, documentation and d...

It is necessary solve two bugs to a Laravel application regard the frontend of condition use php 7.4. if it is necessary you must do changes to the database and the backend

...company specializing in web and mobile apps and digital solutions. We are passionate about creating innovative mobile applications that provide exceptional user experiences. Our team is dedicated to pushing the boundaries of technology to deliver top-notch solutions to our clients. Job Description: We are seeking a talented and motivated Part-Time iOS Mobile App Swift Developer to join our team. In this role, you will work closely with our development team to design, develop, and maintain iOS applications using the Swift programming language. This position offers the flexibility of working part-time, making it ideal for candidates looking to balance work with other commitments. Key Responsibilities: Collaborate with the development team to define project requirements an...

Project Overview: Blockcube Technology is seeking an experienced developer or development team to create a sophisticated web application with integrated advanced machine learning capabilities. This project encompasses several core components essential for a robust, user-centric platform. Project Components: User Registration System: Develop a comprehensive and secure user registration and authentication system. Ensure scalability and seamless user experience. Live Chat Feature: Implement a resilient and real-time live chat system. Ensure high availability and responsiveness. Advanced Machine Learning Integration: Develop and integrate advanced machine learning algorithms to enhance user experience and platform functionality. Key machine learning functionalities should include...

I'm in need of a...7-8 years of proven track record in web application development. Our project is an exciting opportunity to work on both frontend and backend development, as well as bug fixes and maintenance. Key Responsibilities: - Collaborate with the IT Manager on assigned tasks - Frontend and Backend Development - Maintain and fix bugs in the application Skills and Experience Required: - Over 7-8 years of experience in web application development - Proficiency in PHP and Laravel - Strong problem-solving skills - Past experience in similar web applications - Ability to work independently and as part of a remote team - Excellent communication and time-management skills To be considered for this role, please submit your CV and portfolio ...

I'm looking for a highly skilled QT senior development engineer to help build a desktop application. This project will tap into your expertise in various areas such as C++ programming, the QT framework, and user interface design. Key Skills & Experience: - Strong proficiency in C++ - Extensive experience with the QT framework - Excellent User Interface (UI) design skills - Knowledge in Python and 3D will be a plus The main function: 1: Windows platform, jointly developed by QT+python. 2: Communicate with hardware devices through serial port/Ethernet. 3: Support MODBUS-485, TCP, UDP and other communication protocols, with 1ms cycle response. 4: Support hardware parameter configuration, multi-channel data analysis, storage, data playback, and support real-time data curves...

I need a professional translator to translate a document of 1,000 - 5,000 words from English to Spanish and French. Key Requirements: - Fluency in English, Spanish, and French - Proven experience in translation - Attention to detail and accuracy It's an advantage if you have experience in technical documentation, website content, or marketing materials, as these will help with the translation process. Please share samples of your previous work in your proposal.

As an expanding business, we require a proficient Asp.net MVC expert for our new project. The main tasks are: * Developing an e-commerce web application * Integrating a comprehensive product catalog * Implementing a functional shopping cart This project requires someone who has proven their ability to craft user-friendly websites that are not only visually appealing but also functional and secure. It would be beneficial if you have prior experience with developing e-commerce platforms. We look forward to working with a seasoned professional who can deliver robust results. The ideal candidate needs to be savvy in Asp.net, MVC, database integration, and user interface design for a seamless user experience.

I'm seeking an app developer in the Philippines to collaborate with a skilled web developer on a unique project. The app will have multiple functionalities, including user registration and login. Your role will involve closely working with the web developer to ensure seamless integration between the web and mobile platforms. The ideal candidate would: - Have prior experience in app development - Be based in the Philippines - Be able to work closely with a web developer - Be proficient in integrating a variety of functionalities - Have a creative and collaborative mindset Please note that the target audience for this app has not been specified, so you should be comfortable working on a project with potentially broad appeal.

...automation tools, and automating infrastructure provisioning. Containerization tools like Kubernetes or similar.

Each paper should consist of all the categories as attached sample along with diagrams and References. Attaching one Sample Paper for Reference.
 Key Responsibilities: - These Papers should be 100% plagiarism free and should not be detected under any Al Detectors - Should be able to Write Papers 2 Papers Total - 5 pages in each Paper - Explain the topic in detail along with diagrams (Attaching the Sample) I'm looking for someone with: Excellent written communication: Ability to craft clear, concise, and engaging technical content. Experience writing white papers, case studies, or technical blog posts (a plus). Skills Required :
 Technical Writing Research Wr...

We are looking for someone to create a USPTO Trademark Application OBJ for the application files below. Candidates should confirm that they have experience with USPTO trademark applications. If you have already completed USPTO identity verification, let us know as well. Thank you

...powered by AI to highlight key differences. - Exportable Reports with AI-generated summaries. 6. **Security and Integrity** - AI-driven Proctoring for real-time monitoring. - Plagiarism Detection with AI. - Environment Lockdown managed by AI. 7. **Integration and API** - ATS Integration with AI-powered matching. - API Access with AI-driven functionalities. 8. **Support and Documentation** - Help Center with AI-powered search and suggestions. - Customer Support augmented with AI chatbots. - Tutorials and Training with AI recommendations. 9. **Additional Features** - Gamification with AI-generated challenges. - Mobile Support with AI enhancements. - Customization with AI-driven options. 10. **Pricing and Subscription Models** - Flexible ...

I'm on the lookout for a specialist to compile an in-depth and multifaceted sales process documentation. The final product should cover: - Sales cycle flow chart - Sales training playbooks - Comp plans - Meeting agendas - Handbooks - Sales funnels Client intake forms - Any other relevant sales documentation not listed As a freelancer, your past work weighs significantly for this project. Showcase your proficiency in creating similar sales documentation that not only informs but also engages. You should be comfortable creating complex flow charts and formulating playbooks that relay sales strategies efficiently. Your capability to work with Word documents format is essential as I prefer this medium for the final deliverables. Efficiency and attention to detail ...

I am looking for someone with experience in Comsol simulation to help with piezoelectric energy harvester design at the earliest, ideally within a week. - Beyond the simulation work, I need someone with strong documentation skills. - Required: 1) Generated voltage and power for applied strain% (like in cantileve) 2) Device capacitance, resonance frequency & impedance 3) Piezo strain coefficients for device geometry 4) Displacement (actuation) for different voltage 5) Sensitivity (output) for different level of stimuli (added mass in grams and pressure)

I need a plugin that includes Apple Pay, Google Pay, and Link payment methods. This plugin should offer a dynamic button to facilitate these transactions based on Stripe's documentation. Please view the documentation here: The app that uses the plugin should also be able to customize the 'statement description', which is a capability provided by the Stripe API (createPaymentIntent). The suitable person would have experience in creating Bubble plugins, and hopefully would be easy for the person to make a quick and simple payment integration.

I am looking for a person who can build my USDT/BTC flash application

I require an experienced PHP developer who can quickly resolve two broken links on my e-commerce website. The first issue is in the search line reset menu, while the second is between the cart and the payment gateway. Key Responsibiliti...Ensuring the page retains user details between stages - Enabling users to progress to the payment page The fix needs to be completed in the next week. Ideal Candidate: - Proficient in PHP, particularly in e-commerce settings - Strong understanding of custom coding - Ability to work efficiently and meet deadlines - Experience in troubleshooting and resolving similar issues I have existing documentation and code comments available for the sections with issues, so you will have all the necessary resources to identify and resolve the problems. ...

I'm seeking a skilled developer to create a Blazor application with a unique keyboard feature. Key Points: - Your primary task will be to develop a Blazor application. - This application needs to have a unique keyboard feature. Ideal Skills: - Strong experience with Blazor development is a must. - Knowledge of creating unique UI features. - Understanding of user experience design.

I am looking for a professional who can help me create a CV and cover letter that will stand out in the UK and Europe recruitment industry. Key information: - Industry: HR - Target roles: Recruitment Specialist, Human Resources Manager, HR Administrator - Essential certifications: SHRM-CP, CIPD, ATS I am looking for a collaborator who can help me secure interviews for these positions. The CV and cover letter will be the first impression employers will have of me, so they need to be outstanding. I prefer someone who is experienced in 1. UK and Europe recruitment 2. Environmental, water resources management, and sustainability field recruitment 3. using HR tools to increase the hiring rate, eg: Applicant Tracking Software ATS The ideal freelancer for this job should: - Have a strong un...

I'm in search of a C developer with strong math skill...streamlined functionality. Key Tasks: * Calculation optimization focusing primarily on code efficiency * Commenting and providing a succinct documentation The project is expected to be wrapped up in two days. The whole source code will be provided by me, and note that there's no Git involved in this project - that is a separate endeavor. Consequently, proficiency in managing source code manually is essential. Electronic mathematics and cpu. Ideal Skills: * Proficient C programming * Comprehensive understanding of electromagnetism calculations * Exceptional skills in writing efficient code * Ability to comment on code and provide useful documentation * Previous experience with manual source code management....

Introduction We are seeking proposals from experienced web scraping and data analysis firms to conduct a comprehensive data collection and analysis project. The purpose of this project is to gather detailed information on menu items, pricing, customer ratings, promotions, and deals from various food delivery mobile apps operating within our city. The goal is to mine this data for actionable insights to inform our advertising, promotional strategies, and competitive benchmarking. 2. Project Scope The selected vendor will be responsible for developing and implementing a solution to: • Subscribe to and navigate through multiple food delivery mobile apps. • Collect data on menu items including descriptions, pricing, customer ratings, and associated promotions or deals. •...

We are seeking an experienced freelancer to set up a Node.js application on our web hosting service, ensuring it runs correctly and is accessible via a custom domain. Hosting Environment: - Web hosting service: - Custom domain: - Node.js Manager is accessible through the hosting control panel. Task Requirements: - Configure the hosting environment to run a Node.js application. - Upload and set up a simple Node.js script that responds with a fixed message for any route. - Ensure the application is running and accessible via the specified domain. - Verify and configure the necessary firewall and port settings to allow traffic on the required port (default 3000). - Provide documentation of the steps taken and any configurations made. Spe...

Development of a mobile application for tourism is needed. The app will be available on both iOS and Android platforms and will be designed in a minimalistic style. Key Features: - Map Navigation: Users should be able to use the app as a navigational aid. - Tourist Attractions: The app must provide information about various local tourist attractions. - Customer Reviews: Users will need to have the option to read and write reviews of these attractions. - Customer Participation: Additionally, a provision should be made to allow customers to add new attractions. Ideal Skills: - Developers should have expertise in iOS and Android app development. - Knowledge and experience in creating minimalistic designs are necessary. - Experience dealing with GPS and map integrat...

I need a skilled C# Winform .NET developer to protect my application using obfuscation techniques. The goal is to prevent reverse engineering and ensure the highest level of security. Key Requirements: - Implement Basic name mangling, Control flow obfuscation, and String encryption for the application. Ideal Skills and Experience: - Strong proficiency in C# and .NET framework - Prior experience with implementing obfuscation techniques - Knowledge of application security best practices This project is a great opportunity for a developer with a keen interest in application protection.

Overview: This application will enable Shopify store owners to collect and display customer reviews. However, only customers who have made a purchase will be able to leave a review. You can use the product reviews sample app from Shopify Github if you want, it is not a problem for me. Project Requirements: User Authentication: • Only customers who have made a purchase should be able to leave a review. • There should be no public option for writing a review on the store’s frontend. Review Collection: • After a purchase, customers should receive an invitation via email to write a review. Review Display: • Reviews submitted by customers should be displayed on the respective product page of the Shopify store. Webservice Integration:

...content of each channel. **Requirements:** 1. **Copyright-Free Music:** The music must be completely free of copyright restrictions, suitable for monetized videos. 2. **Variety of Genres:** Music should cater to both travel and tutorial themes, ranging from upbeat and adventurous for travel videos to calm and focused for tutorial content. 3. **Duration:** Tracks should be varied in length, from short 30-second pieces to full 3-5 minute tracks. 4. **High-Quality Audio:** Music must be of high quality, professionally mixed and mastered. 5. **Original Composition:** Preferably original compositions, but high-quality, royalty-free library music is also acceptable. **Deliverables:** - A collection of 10-15 music tracks that meet the above requirements. - Documentation...

I am in need of an experienced developer to create a project management web application that's colorful and vibrant. My vision is to have: - Task allocation and tracking: An integrated functionality that gives us the ability to multi-task and keep track of on-going projects. - Time tracking: Time management is crucial for us, we need a system that keeps things timely and organized. Ideal candidates should have experience in developing project management software or any relevant web applications. Familiarity with a vibrant and colourful user interface is also a key requirement. Show me your relevant portfolio so we can collaborate effectively to bring this vision to life.

...GitHub Actions, set up logging for each service, and configure an HTTPS domain for our web application hosted on Google Cloud Platform (GCP). The ideal candidate should have extensive experience with GCP, CI/CD pipelines, and HTTPS configuration. Scope of Work: 1. CI/CD Implementation: - Set up a CI/CD pipeline using GitHub Actions for automated testing, building, and deployment of both frontend and backend applications. - Integrate the pipeline with our GCP infrastructure, including Compute Engine, Cloud SQL, and Cloud Storage. 2. Logging Setup: - Configure logging for all services: -- Frontend (Nginx, ): Log HTTP requests, errors, and application logs. -- Backend (Gunicorn, Django): Log application errors, access logs, and system logs. -- Celery and Bea...

Project Description: Mobile Application for Inventory Management Objective: Develop a Minimum Viable Product (MVP) of an Android application for inventory management and tracking using GPS and Bluetooth beacons. Technology: Flutter Key Requirements The Application -------------------------- - The app should primarily be developed in Flutter. However, since a Foreground service is required to run indefinitely in the background, it is acceptable to create this service in Kotlin or Java. Communication between Flutter and the native code should be done via Platform Channels (MethodChannel and EventChannel). User Interface ----------------------- The app should have three main screens: - Splash Screen: Displays the app logo. - Login Screen: User authentication...

...in ensuring the quality and reliability of our software. You will work closely with our development team to meticulously test and validate our applications, identifying and rectifying any issues that may arise. Key responsibilities include: - Conducting rigorous testing across our web applications to detect and report bugs. - Collaborating with developers to ensure seamless integration and functionality. - Employing your strong analytical and strategic thinking to formulate effective testing strategies. Requirements: We are seeking an individual who possesses: - Very good knowledge in various testing methodologies, frameworks, and tools. - Good knowledge of software development lifecycles and processes. - A meticulous attention to detail and a passion for delivering high-q...

I desire a professional Macrodroid developer with a strong portfolio to create a macro for any use. The objective of the macro is to read a CSV file and automatically send a specific WhatsApp message to each phone number listed in the file. Key requirements include: - import a CSV file (Name,Given Name,Additional Name,Family Name,Phone 1 - Type,Phone 1 - Value) - Creation of a macro that automatically triggers WhatsApp messages. - The macro should be programmed to initiate the messages when it reaches a phone number listed in the CSV file. - The message is from CSV or default the same for all numbers in the CSV file. Ideal Candidate: - Proficiency and extensive experience working with Macrodroid. - A proven track record with similar projects. - Strong attention to detail to ensu...

I'm interested in application development for both Android and iOS platforms. The key feature is to allow sending SMS messages to a selected database. Any professional stepping into this project should be able to handle: - Database development: The backend needs to be designed to store contact details efficiently. Expectation is to accommodate less than 100 contacts initially, with potential for future expansion. Strong database management skills are a prerequisite. - App development: Looking for someone with profound knowledge of Android and iOS app development. Familiarity with SMS integration in apps is essential. Don't shy away from illustrating your previous experience in similar projects when bidding.

I'm in need of a skilled full-stack developer to create a website that is primarily aimed at monitoring ...uymbai The target audience for this website is less than 10 employees so the system should be designed to handle this scale effectively. Additionally, the website should be able to generate daily reports based on the tracked data. This will help me keep tabs on the efficiency and productivity of my team on a daily basis. Ideal skills and experience for the job would include: - Proficiency in web development technologies - Previous experience in developing similar systems - Strong understanding of user experience principles - Ability to integrate reporting features into the system If you're confident in your abilities to deliver such a product, I'm looking for...

I require an individual proficient in VB macro script for Mach3. This pr...script that need to be rewriten to mach3 VB language, I have also a video how it works in mach4 fo refernece. You should be able to implement these specifications based on available documentation. Please remember that the recreated script should maintain as much fidelity to the original Mach4 script as possible. Ideal skills and experiences for the job include: - Familiarity with Mach3 and Mach4 CNC software - Expertise in creating VB macro scripts - Understanding of CNC machine operation, particularly regarding arc motion control, B/C axis, and zeroing their position - Ability to work with provided documentation for accurate script translation - Past experience in similar projects would be a signi...

...IGST Freight charge Gross amount The task involves creating a TDL (Tally Definition Language) or TCP (Tally Compiled Program) file that will facilitate the extraction of this data from the Tally database using ODBC Requirements: Strong knowledge and experience with Tally and its database structure. Proficiency in TDL or TCP file creation. Familiarity with ODBC for database connectivity. Ability to automate the extraction process to ensure seamless and accurate data retrieval. Deliverables: A functional TDL or TCP file that successfully extracts the specified data fields. Documentation and instructions on how to use the provided solution. Support for initial setup and troubleshooting any issues that arise during implementation. If you have the expertise to handle this pro...

...with expertise in both User Interface (UI) and User Experience (UX) for a web application. The primary goal of the project is to elevate user engagement and enhance usability. Ideal Skills and Experience: - Proven UI and UX design experience specifically for web applications - Ability to understand and incorporate strategies for increasing user engagement - Competence in improving the usability of digital tools - Proficiency in wireframing and prototyping, and iterative design - Comprehensive portfolio showcasing relevant work Your responsibility will be to design an intuitive, engaging interface that maximizes user engagement and improves the usability of the application. A clear understanding of web application usability standards is requir...

It is necessary solve two bugs to a Laravel application regard the frontend of condition use php 7.4. if it is necessary you must do changes to the database and the backend

I have a small wordpress website. No e-commerce, forums etc., no other user-interaction except for an (optional) contact form. The website needs to be migrated to a simple Bootstrap website, maintaining roughly the look and feel of the existing site. Deliverables: - Bootstrap Website running on our hosting provider - Documentation and maintenance instructions Requirements: - The simpler the better - No external (3'rd party) dependencies - May suggest and implement improvements (functional and graphical) Time-Frame: - Completion within 3 months More details and link to website will be shared upon first contact.