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I am building an AI-powered performance and coaching platform for endurance athletes, coaches, and training teams. The product is designed for runners, cyclists, and triathletes, combining customized training plans, athlete data integrations, AI-assisted coaching, recovery analysis, race preparation, nutrition, blood work, body composition, and coach/athlete management in one platform. The goal is not to build another simple fitness tracker or generic social fitness app. The goal is to create a coaching operating system for endurance sports, where athletes receive personalized training guidance and coaches can manage their athletes more efficiently using real performance data and AI-assisted insights. The platform should connect and organize athlete data from sources such as Strava, Garmin, Apple Health, Health Connect, and other health/performance platforms. Based on this data, the system should help coaches and athletes analyze training load, recovery, readiness, progress, fatigue risk, race preparation, nutrition needs, blood work, and body composition. The platform already has an existing foundation, and I am looking for an experienced developer to help improve, stabilize, refine, and continue building the product toward a closed beta launch. Core Product Vision The product will serve two main users: 1. Athletes Athletes will use the app to receive personalized training plans for running, cycling, and triathlon, track progress, understand recovery, prepare for races, receive AI-assisted recommendations, and communicate with their coach or training team. 2. Coaches / Training Teams Coaches and endurance training teams will use the platform to manage athletes, review performance metrics, generate and adjust training plans, monitor fatigue and risk, analyze adherence, review health data, and provide better feedback using AI-assisted insights. The AI should act as a copilot for the coach, not a replacement. It should help analyze data, suggest adjustments, summarize athlete status, and support training-plan creation, while allowing the coach to review and approve key decisions. Key Features Athlete App Personalized training plans for running, cycling, and triathlon Training plan customization based on: Fitness level: beginner, intermediate, advanced Specific goals: weight loss, speed improvement, distance training, race preparation Available time per week Race date and target event Training history Recovery and readiness data Injury history or limitations Daily training recommendation: “What should I do today?” Adaptive training-plan adjustments based on missed sessions, fatigue, poor sleep, high load, or upcoming race Recovery and readiness dashboard Nutrition and fueling guidance Race week planning Blood work and body composition tracking AI Coach chat and insights Integration with Strava, Garmin, Apple Health / Health Connect Simple, intuitive, premium user experience Coach / Team Dashboard Coach dashboard to manage multiple athletes Athlete list with status indicators: ok, attention needed, fatigue risk, inactive Individual athlete profile with: Recent activities Training adherence Training load Recovery trends Sleep, HRV, resting heart rate and other health metrics Race goals Body composition Blood work data Notes and feedback AI-generated weekly athlete summaries AI-assisted training-plan builder Training-plan review and approval workflow Smart alerts for coaches: Missed key sessions Training load spikes Fatigue risk Poor recovery Race approaching Unusual health/performance changes Coach-to-athlete communication tools Ability to assign, edit, and adjust training plans AI-Assisted Coaching Generate customized training plans based on athlete profile and goals Analyze training data from connected platforms Suggest plan adjustments based on recovery, fatigue, adherence, and progress Summarize athlete status for the coach Identify risk signals and performance trends Help interpret blood work and body composition data in a safe, educational way Provide explainable recommendations, not generic chatbot responses Example: “This athlete completed 5 out of 6 planned sessions this week, increased training load by 18%, had a drop in HRV, and reported poor sleep. Suggested adjustment: reduce intensity tomorrow and keep the next session in Zone 2.” Current / Planned Tech Stack The platform currently includes or is planned around: [login to view URL] / React / TypeScript Tailwind CSS Supabase Flutter mobile app AI API integration Stripe Strava integration Garmin / wearable data integrations Apple Health / Health Connect Coach dashboard Athlete app Training plan modules Nutrition, recovery, readiness, and performance modules What I Need Help With I am looking for a developer who can help with: Reviewing the existing codebase and architecture Improving and stabilizing the web and mobile product Building and refining the coach dashboard Improving the athlete onboarding flow Building customized and adaptive training-plan workflows Implementing training-plan logic based on user inputs and performance metrics Integrating and organizing athlete data from multiple sources Helping implement AI-assisted coaching features Improving UX/UI, performance, reliability, and production readiness Preparing the product for a closed beta launch Helping prioritize features and build with a strong product mindset Ideal Candidate The ideal candidate should have: Strong full-stack development experience Experience with React, [login to view URL], and TypeScript Experience with Supabase or similar backend/database tools Mobile app development experience Flutter experience is a strong plus Experience with AI APIs is a strong plus Experience building fitness, health, wearables, coaching, or data dashboard products is a major plus Understanding of endurance sports, training plans, running, cycling, or triathlon is a major plus Good UI/UX sensibility Ability to implement customization logic based on user inputs and athlete data Strong product thinking, not just coding ability Comfort working with an early-stage startup/product What I Am Looking For I am looking for someone reliable, proactive, and able to think like a product partner. This is not just a one-time bug-fix project. If the collaboration works well, this can become a long-term development role. The right person should be able to help turn the current platform into a polished, user-friendly, and effective training and coaching solution for endurance athletes and coaches.
Project ID: 40562053
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129 freelancers are bidding on average $1,319 USD for this job

⭐️⭐️⭐️ AI-Powered Endurance Coaching & Performance Platform ⭐️⭐️⭐️ Hello, I checked the JD and understand you’re looking for an experienced full-stack developer to enhance and stabilize your existing AI-powered coaching platform for endurance athletes and coaches. The goal is to refine the current product, improve the coach dashboard, strengthen athlete workflows, integrate wearable data, and prepare the platform for a production-ready closed beta launch. Features: * Athlete & Coach Dashboard * Personalized Training Plans * Adaptive Training Workflows * AI-Assisted Coaching * Athlete Performance Analytics * Recovery & Readiness Dashboard * Training Load & Fatigue Analysis * Race Preparation Module * Nutrition & Fueling Guidance * Blood Work & Body Composition Tracking * Coach-Athlete Communication * Strava, Garmin & Health Platform Integrations Let’s chat… Thanks
$980 USD in 12 days
9.7
9.7

Hi, Turning messy athlete data into trustworthy coaching decisions is the priority. With Strava, Garmin, Apple Health/Health Connect, AI summaries, and adaptive training logic all feeding one workflow, the main risk is inconsistent data or weak plan rules leading to poor recommendations. I’ve built mobile and web products where success depended on clean sync, clear status logic, and a coach-friendly review flow. My first step would be to review the current architecture, map the athlete and coach journeys, and stabilize the data flow before adding more features. Then I’d tighten onboarding, the training-plan builder, and the approval workflow so the coach stays in control while AI handles summaries, alerts, and suggested adjustments. This keeps the beta usable, explainable, and easier to trust. Relevant experience includes complex integrations, workflow logic, and AI-assisted outputs where reliability and clarity were critical. Timeline: I can start with an architecture and workflow audit immediately, then move into implementation once the highest-risk issues are identified.
$787 USD in 18 days
9.5
9.5

With over a decade of experience in full-stack architecture and high-scale systems, I understand your project goal of building an AI-powered performance and coaching platform for endurance athletes, coaches, and training teams. My background in scaling systems for over 1 million users and developing high-security FinTech solutions directly applies to the complexity of creating a coaching operating system for endurance sports like yours. To ensure scalability and security for your Multi-Sport Endurance Training App, I recommend implementing a microservices architecture to modularize components and enhance performance. My past success in building Telegram Mini Apps serving a large user base showcases my ability to handle such high complexity projects. I am eager to discuss how we can further improve, stabilize, and refine your platform to meet your goals and achieve a successful closed beta launch. Please feel free to reach out to discuss the roadmap and how we can collaborate to bring your vision to life.
$1,200 USD in 20 days
9.0
9.0

Hello, Greetings Hope you are doing well. I am a Mobile Application developer with over 5 years of experience. I am confident in my ability and skills to develop high-quality Mobile apps and would like to work on your multi sports endurance training app project. I will complete the work as per your requirements. I want to discuss more this project to prepare the final concept. So let’s discuss this in detail over chat then will make plans to start work on it. Waiting for your earliest reply. Thanks. Shubham
$750 USD in 18 days
7.9
7.9

Hello, I will develop your SPORTS EDUCATIONAL COACH MOBILE APPLICATION for Android and IOS both platforms with Web admin panel. I am Tulsiram. I have 10 years of experience working as Native and Crossplatform mobile application developer. I am understood your requirements. I am glad if we are working together. If you interested then let's connect. I will provide you Daily updates ,source code after development completed, 1 Year maintenance Support in following Steps: I will available daily 10-12 hours in Working days for you. I will provide you regular updates according to which modules we will decided. After approval each module by you then i will provide your complete source code of your project and will shift on your Domain. Thanks
$750 USD in 35 days
6.3
6.3

Hey, treating AI as a coach copilot instead of replacing the coach is the part that makes this platform stand out. I can build on your existing foundation, connect athlete data sources, and structure the AI layer so recommendations are grounded in real training, recovery, and health metrics while keeping coaches in control. The tricky part is combining data from platforms like Strava, Garmin, and Apple Health into a consistent model before generating useful insights. Which integrations are already working today, and which are still on the roadmap?
$750 USD in 15 days
6.0
6.0

Hi there, We’ve developed several fitness and health products, including a web and mobile app for trainers and trainees that uses AI to generate personalized training plans based on user data. We also built a web app for trainers to manage multiple trainees, monitor their performance, and provide feedback. With our extensive experience in fitness and health solutions, we can deliver a product that meets your exact needs. We’re well-versed in integrating with fitness devices and wearables, and we’ve worked with AI models like OpenAI and Azure to create effective solutions. Let’s schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit for your needs. I’m looking forward to hearing more about this exciting project. Best, Adil
$1,149.87 USD in 21 days
6.0
6.0

Hey, syncing disparate data from Strava and Garmin while keeping the training load calculations accurate is the real hurdle here, especially when handling inconsistent API refresh rates. I’d focus on building a resilient background worker to normalize those incoming streams before they hit your AI engine. The trickiest part is preventing the AI from suggesting conflicting training loads when an athlete’s HRV and sleep data don't align. How are you currently handling the data normalization layer for those different health platforms?
$750 USD in 11 days
5.4
5.4

As a highly experienced developer and lead at SoftwareLinkers, I have an immense understanding of what sets an exceptional digital product apart from the rest. Your Multi-Sport Endurance Training App aligns perfectly with my expertise in PHP & MySQL backend development, RESTful API creation and integration, which are necessary for the extensive data tracking and analysis your project requires. My firm grasp of React.js and Flutter app development will also ensure your choice to integrate these platforms alongside your website is effectively executed. Having built secure and scalable digital systems for diverse clients including logistics companies, enterprises, and eLearning platforms, I comprehend the importance of tailoring a user experience precisely to meet the needs of each specific platform user. Through intuitive design and streamlined usability, my aim is to help athletes easily navigate through personalized training plans, nutrition guides, recovery insights, as well as AI chat functionalities that will serve as a copilot for coaches.
$1,200 USD in 24 days
5.3
5.3

I hope you're doing well! My name is Nawal, and I bring over nine years of experience in Multi-Sport Endurance Training App. After carefully reviewing your project brief, I’m confident that I understand your needs and can deliver exactly what you're looking for. Here’s what I offer: ✅ Multiple initial drafts within 24 to 48 hours ✅ Unlimited revisions until you're 100% satisfied ✅ Final delivery in all required formats, including the editable master file and full copyright ownership You can check out my portfolio and past work here: ? Freelancer Profile – eaglegraphics247 I’d love to discuss your project further and explore how we can make your vision a reality. Let me know a convenient time for a quick chat! Looking forward to working together. Best regards, Nawal
$750 USD in 1 day
4.9
4.9

hi, i can help review and stabilize your endurance training platform with nextjs typescript tailwind supabase and flutter, building the coach dashboard, athlete onboarding, adaptive training plan workflows, data integrations with strava garmin and apple health, and ai-assisted coaching features for recovery analysis and performance insights. deliverables include a polished product ready for closed beta launch with improved ux ui performance and reliability. my experience with full-stack development and fitness data platforms matches your needs precisely. i can start right away. thanks
$750 USD in 10 days
4.0
4.0

With your Multi-Sport Endurance Training App, I understand you're aiming for something beyond the typical fitness tracker or social fitness app. I'm Arun, a seasoned Full-Stack Developer with a distinct mobile app development background and experience in creating user-friendly digital products that help businesses grow. Your project is tailored to athletes and coaches in need of personalized training plans and data analysis - key areas where my skillset shines. I have a vast knowledge of APIs and data integration, meaning I can efficiently connect and organize athlete data from various sources like Strava, Garmin, Apple Health, and more into one cohesive platform. Over the course of my 14-year career, I've honed my skills in analyzing complex information to generate actionable insights, which aligns perfectly with your goal of incorporating artificial intelligence to assist but not replace human coaching. In conclusion, my extensive experience as a developer versatile across platforms combined with my passion for innovative problem-solving aligns perfectly with the complex needs of your AI-powered performance and coaching platform. By hiring me, you're bringing on a dedicated partner who is committed to transforming your vision into an efficient reality for endurance athletes everywhere!
$1,200 USD in 10 days
3.9
3.9

I understand you're building an AI-powered performance and coaching platform for endurance athletes, coaches, and training teams, specifically for runners, cyclists, and triathletes, aiming to create a coaching operating system beyond a simple fitness tracker. My experience developing a data-driven athlete performance dashboard that increased user engagement by 25% directly aligns with your goal of providing personalized training guidance. I will build the core athlete data integration and training plan generation modules using Python with FastAPI for the backend and React for the frontend. This will involve setting up secure API endpoints for integrating with common athlete data sources and developing a dynamic training plan algorithm that adjusts based on user input and performance metrics, visualized through interactive charts and progress trackers. How will athlete performance data be prioritized for AI model training to ensure the most impactful insights are delivered first? Ready to start as soon as you confirm scope.
$1,263 USD in 21 days
1.4
1.4

Hello, As a creative problem-solver and full-stack developer with a deep understanding of UI/UX, I have the unique ability to blend artistic design with technical finesse - which aligns perfectly with the vision you have for this app. Over my years in the industry, I've used this combination of skills to craft elegant and intuitive digital platforms. My design ethos is focused on creating not just something aesthetically pleasing, but a platform that's highly functional and user-friendly, a quality I believe is vital when it comes to your multi-sport endurance training app. Your users will be able to personalise their training plans, track progress, understand recovery, and communicate seamlessly with their coaches - all through an interface they find compelling. Moreover, I understand that your AI isn't about replacing coaches, it's about complementing them. And that's the kind of collaborative mindset I bring to every project, maximum utility for your users by ensuring all features work in tandem and are easy to use. Give me the opportunity to elevate your app to new limits, and provide athletes and coaches alike with the cutting-edge tools they need for peak performance. Thanks!
$750 USD in 5 days
0.0
0.0

Rio de Janeiro, Brazil
Member since Jul 5, 2026
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