Open projects

Click any project to see full details, client need, and apply.

All projects

Posted 12 days agoLarge

Proposals:0 to 2

Mobile App Developer – Long-Term Development & Maintenance

We are looking for a reliable Mobile App Developer to join our team for long-term development and maintenance of an existing education management platform. The developer will work on new features, bug fixes, performance improvements, testing, and ongoing maintenance of the mobile application. You should be comfortable understanding an existing codebase, fixing issues independently, and delivering clean, maintainable code without introducing unnecessary technical debt. The role requires consistent communication, realistic task estimation, proper testing before QC, and commitment to agreed deadlines and availability.

WorkingTrust Client

not specified

$2,640.00 fixed price

Mobile App Development6 months flexible660 connects

$ 197K+ spent

Payment Unverified

Posted 12 days agoLarge

Proposals:0 to 2

Convert Existing Web App to Mobile App

We are looking for an experienced mobile app developer to optimize and convert an existing web application into a stable, responsive mobile application. The developer will review the current web application, improve its mobile experience, and ensure the core features work reliably across mobile devices. The project may involve frontend improvements, backend and database integration, authentication, API connections, and mobile UI/UX optimization. Experience with React.js, Supabase, modern AI development platforms, and full-stack development is highly preferred. The ideal developer should be able to work independently, communicate clearly, troubleshoot issues effectively, and deliver a reliable mobile application based on the existing web product

Web/Mobile App Client

United States

$10.00 fixed price

Mobile App Development1 month flexible14 connects

$ 315 spent

Payment Unverified

Posted 20 days agoMedium

Proposals:0 to 2

Mobile App Developer for Social App – Production Refinement & Launch Preparation

I have built an MVP for a social app and am looking for an experienced mobile app developer to help refine the existing application and prepare it for production launch. The application is already in MVP stage, so the primary focus will be reviewing the current build, identifying existing issues, fixing features that are not working correctly, improving application stability, and making the necessary updates to ensure the app is reliable and ready for release. The developer will work with the existing codebase and should be comfortable reviewing an existing mobile application, troubleshooting issues, improving performance, and preparing production-ready builds for both Android and iOS. Experience with social applications is a strong plus.

Arjun Mehta

India

$250.00 fixed price

Mobile App Development1 month flexible15 connects

$ 1K+ spent

Payment Unverified

Posted 20 days agoMedium

Proposals:0 to 2

Mobile App Developer for Danish Renter Membership Platform – iOS & Android

We are looking for an experienced mobile app developer to develop the first version of a modern mobile application for a Danish renter membership platform. The platform is designed to provide renters with a simple and secure place to manage important tenancy information, rental documentation, property details, and related resources. A live website and membership platform already exist. The objective of this project is to develop a professional mobile application for both iOS and Android that integrates with the existing web platform and provides a strong technical foundation for future expansion. ### Version 1 Features * User registration and login * Member profile and account management * Rental/home overview * Secure upload and storage of rental contracts and documents * Upload and organization of move-in and move-out photos * Take photos directly from the mobile device * Attach photos to the relevant property, room, or category * Simple documentation overview * Access to help and guidance * Integration with existing AI assistance where technically possible * Integration with the existing website and member system/API * Clean and modern user interface * iOS and Android support ### Future Platform Vision The application should be designed with scalability in mind. Future features may include: * Landlord profiles and verification * Tenant experiences and landlord reviews * Rental property listings * Finding rental homes through the platform * Member benefits * Insurance, internet, moving, and partner services * Tenancy-related notifications and reminders * Additional AI functionality These features are not included in Version 1 but should be considered when designing the technical architecture. ### What We’re Looking For * Experience developing production mobile applications for iOS and Android * Ability to recommend the appropriate technology and architecture * Experience with secure document and image storage * Strong understanding of authentication and user privacy * Ability to create clean and modern mobile interfaces * Experience integrating mobile applications with existing websites and APIs * Experience with App Store and Google Play deployment * Experience with membership or subscription platforms is a plus * Ability to provide technical recommendations and development guidance * Strong communication and project management skills ### Technical Consultation The developer should provide recommendations regarding: * Best technology and architecture for the application * Cross-platform versus separate native iOS and Android development * Secure file and image storage * Authentication and user privacy * API integration with the existing platform * Scalability for future features * Cost-effective development strategy for Version 1 ### Proposal Requirements Please include: 1. Recommended technology for the application and why 2. Estimated development time for Version 1 3. Estimated total development cost or budget range 4. Examples of similar mobile applications developed 5. Required information and access from the existing website 6. Recommendation between cross-platform and native development 7. Features that should potentially be simplified or postponed to keep Version 1 cost-effective 8. Experience with secure document and image management 9. Experience with App Store and Google Play deployment ### Website [www.lejersnet.com](http://www.lejersnet.com)

Mikkel Jensen

Denmark

$30.00 fixed price

Mobile App Development3 months flexible8 connects

$ 12K+ spent

Payment Unverified

Posted 20 days agoLarge

Proposals:0 to 2

Android Developer for App Modernization, SDK Upgrades & Release Preparation

We are looking for an experienced Android Developer to update an existing Android application to the latest development tools and prepare it for release. This is a maintenance and modernization project with no new feature development. The primary focus is upgrading the existing application, resolving compatibility issues, migrating outdated libraries and APIs, and ensuring the application works reliably on recent Android releases. The work includes upgrading to the latest libraries and Google's current build platform, migrating to current recommended versions of Android APIs and services such as Google Pay, Google Maps, and related SDKs, and resolving UI layout and functionality issues on recent Android versions. The ideal developer should be highly experienced in debugging existing Android applications, handling deprecated APIs and version migrations, resolving UI layout problems, and performing thorough testing across recent Android versions. Some migrations may require significant code changes or rework, particularly where older payment or platform integrations have changed. The final objective is to deliver a clean, stable, tested, and release-ready Android application.

Michael Richardson

United States

$40.00 fixed price

Mobile App Development2 months flexible8 connects

$ 168K+ spent

Payment Unverified

Posted 20 days agoSmall

Proposals:0 to 2

AI-Powered Wound Measurement Mobile App – Computer Vision & AI

We are looking for an experienced mobile app and AI/Computer Vision developer to build a proof-of-concept mobile application for automated wound measurement from smartphone photographs. The application should allow a caregiver or clinician to capture or upload a wound photograph and automatically detect the wound area, calculate length, breadth, and estimated depth, and display the measurements directly on the image. The solution should be available for both Android and iOS and must be installable and testable on real devices. The project will be delivered in two phases. Phase 1 will focus on developing a functional proof of concept, while Phase 2 will refine the POC into a more complete and usable application with comparison and reporting capabilities. ### Technical Requirements * Android and iOS mobile application * AI-based wound detection and segmentation * Automated wound boundary detection * Length measurement * Breadth/width measurement * Depth estimation * Measurement overlay on captured images * Confidence indicator * PDF or on-screen measurement report * AI-generated wound medical report * Version-to-version wound measurement comparison * Healing trend visualization * Camera and image upload functionality * Real-device testing on Android and iOS ### Preferred Technical Approach The developer should recommend a practical approach for estimating wound depth from smartphone imagery. Possible approaches include phone depth sensors such as iPhone LiDAR/TrueDepth or Android ARCore Depth API, stereo or multi-angle image capture, calibrated reference objects, photogrammetry, or another proven method. The selected approach should provide a legitimate, testable measurement rather than a rough estimation. AI/Computer Vision approaches such as YOLO, U-Net, segmentation models, image-quality checks, and other suitable open-source technologies may be considered based on the developer's recommendation. ### Phase 1 – Proof of Concept *Budget:* USD $800 *Duration:* Approximately 1 week The Phase 1 application should: * Allow users to take or upload a wound photograph * Automatically detect and segment the wound boundary * Calculate length, breadth, and depth * Display measurement lines and wound boundaries on the image * Run end-to-end on Android and iOS * Provide a working installable build * Include a brief explanation of the technical approach * Include first-round testing performed by the developer ### Phase 1 Deliverables * Installable Android APK or Play Console internal test build * Installable iOS TestFlight or equivalent build * Source code * Technical approach summary * Libraries and AI/ML models used * Testing summary * Working demonstration ### Phase 2 – Full Working Solution *Budget:* USD $1,000 *Duration:* Approximately 2 weeks If Phase 1 is successful, Phase 2 will focus on improving and productionising the application. The Phase 2 scope includes: * Refinement of the Phase 1 POC * Improved UX/UI * Wireframes and UI designs * Version-to-version wound measurement comparison * Side-by-side comparison of previous and current measurements * Healing trend view * Detailed AI-generated medical wound report * Updated Android and iOS builds * Continued testing and bug fixing * Updated source code and documentation ### Working Requirements * Daily stand-up calls are mandatory * Meetings will be conducted through Zoom * Meetings may be recorded for project documentation * Developer must test the application before client testing * Regular written progress updates are required * UX/UI designs must be reviewed and approved before full implementation * Developer should be available for a fast-moving 1–2 week engagement ### Cost Requirements The Phase 1 POC should be developed using the developer's existing environment and available tools. Open-source or free-tier AI/ML libraries and models should be preferred. Any unavoidable paid API, SDK, license, cloud GPU, or third-party service cost must be clearly identified before development begins. ### Proposal Requirements Applicants should provide: 1. Relevant experience with AI-based image measurement, computer vision, photogrammetry, AR depth sensing, or medical imaging 2. Examples of relevant applications, repositories, demos, or case studies 3. Proposed approach for depth measurement 4. Confirmation of availability for daily stand-ups 5. Any unavoidable third-party costs 6. A realistic Phase 1 development plan 7. Confirmation that they understand the success-based Phase 1 milestone

James Anderson

Australia

$1,800.00 fixed price

Mobile App Development21 days flexible450 connects

$ 1K+ spent

Payment Unverified

Posted 21 days agoMedium

Proposals:0 to 2

Full-Stack Developer for Car Rental Web & Mobile Apps- React, React Native, Node.js, AWS

We are looking for an experienced Full-Stack Developer to build and maintain a modern car rental platform for both web and mobile applications. The platform will allow customers to browse available cars, check pricing and availability, make bookings, manage their reservations, and complete payments. We will also need backend and admin functionality to manage vehicles, customers, bookings, payments, and other platform operations. Tech Stack: * Frontend: React.js, Next.js, TypeScript * Mobile: React Native * Backend: Node.js, Express.js / NestJS * Database: PostgreSQL / MySQL / MongoDB * Cloud: AWS * APIs: REST APIs and third-party integrations * Authentication: JWT / OAuth * Payments: Stripe or similar payment gateway Key Responsibilities: * Develop responsive web applications using React/Next.js * Develop cross-platform mobile apps using React Native * Build and maintain scalable Node.js backend APIs * Design and manage database structure * Implement car listings, search, filters, availability, pricing, and booking * Build customer registration, login, profiles, and booking management * Integrate payment gateways and payment workflows * Develop admin functionality for vehicles, bookings, users, pricing, and reports * Integrate third-party APIs where required * Deploy and manage applications on AWS * Write clean, maintainable, and scalable code * Perform testing, debugging, and performance optimization We’re Looking For: * Strong experience with React, React Native, Node.js, and Next.js * Good understanding of backend architecture and APIs * Experience with AWS and cloud deployment * Experience building booking, marketplace, or rental platforms is a strong plus * Good database and API design skills * Ability to work independently and communicate clearly * Experience working with existing codebases is a plus Long-Term Opportunity: This is not just a one-time project. We have multiple products and projects in the pipeline and are looking for a reliable developer who can work with us on a long-term basis if the initial project goes well. Please share examples of car rental, booking, marketplace, or similar web/mobile applications you have developed. When applying, please also mention: 1. Your experience with React, React Native, Node.js, and Next.js 2. Similar projects you have worked on 3. Your availability per week 4. Your hourly rate 5. Your estimated timeline for an initial MVP

WorkingTrust Client

India

$1,000.00 fixed price

Mobile App Development72 hours flexible250 connects

$ 8K+ spent

Payment Unverified

Posted 1 month agoMedium

Proposals:0 to 2

Driver On-Demand App Developer for Android & iOS

We’re looking for an experienced mobile app developer or small team to build a Driver On-Demand / Driver Directory application for both Android and iOS. The main idea is to make it easy for users to find available drivers, view their information, request a driver and track the driver after a booking is made. The app should have a simple and user-friendly interface, reliable location tracking and secure payment integration. We’re looking for someone who can handle the main mobile development and make sure the app works smoothly on both platforms

Driver Services TEAM

Worldwide

$250.00 fixed price

Mobile App Development168 hours flexible12 connects

$ 200 spent

Payment Unverified