Freelance full stack lead developer
A lead developer who owns the technical side of your product, from idea to the app stores.
I’m Ty Ha, a freelance full stack lead developer based in France (BTHA System). I design the architecture, build and ship web and mobile applications for founders and product teams: stack, backend, frontend, deployment, then submission to the App Store and Google Play. You have a single technical point of contact, from the first mockup to launch.
Lead developer, freelance or embedded in your team
I work either on standalone projects or as a full stack lead developer inside an existing product team: architecture, stack choices, ticket breakdown, code review and coordination with founders, design and business. My strongest suit is mobile taken all the way, from the first mockup to App Store / Google Play submission.
- Delivery
- A credible MVP, live on the announced date, without scope creeping along the way.
- Architecture & stack
- Pick a simple, maintainable stack, structure the app and backend, and decide what gets built now versus later.
- Technical translation
- Turn a business need, even a vague one, into prioritized features and technical decisions explained in plain language.
- Quality & follow-up
- Code review, tests, monitoring, fixes: the product stays solid and looked after once it is live.
FAQ · The questions I get asked most
Click a question to expand the answer.
How much does it cost to build an app or an MVP?
My indicative day rate is €450, and each service (PoC, MVP, web app, mobile app, e-commerce) can also be quoted as a fixed price. Ranges are published on the Pricing page; the final price depends on the number of screens, the features and whether a mockup already exists.
Do you handle the whole development?
Yes. Architecture, backend, frontend, testing, deployment, App Store and Google Play publication, then maintenance. You have one technical point of contact and one person accountable for quality.
React Native or Flutter for my mobile app?
Both give you an iOS and Android app from a single codebase. I choose with you based on your team, your integrations and the expected look and feel. Either way, I deliver through to store submission.
Do you work with non-technical founders?
Yes, they are most of my clients. I translate needs into prioritized features, explain every technical choice in plain language and provide a realistic technical roadmap before writing code.
Can you join an existing team as a lead developer?
Yes. I take the full stack lead developer role in a product team: architecture, stack choices, task breakdown, code review and coordination with design and business, with particular expertise in mobile taken all the way to publication.
ABOUT ME
My story
Former illustrator and art studio manager, I shifted into tech with a passion for building meaningful apps and delivering great user experiences
Now a certified Full Stack Developer, I specialize in mobile apps with Flutter and React Native, and work at the crossroads of Web3, AI and Pet Tech
I often join hackathons as a blockchain integration expert —wallet connect, smart contracts, and decentralized identity are my jam. I’m also known for my strong client focus and my ability to truly listen and translate needs into smart solutions
Skills
Languages
Frameworks (Web|Mobile) & Libraries
Back-end & Databases
Web3 dapp & Blockchain
Tools & DevOps
Design & UX
AI & Automation
From Idea to Reality
My goal is to transform your vision into a stunning digital experience. Here's my straightforward process to bring your dream website to life.
Let's Talk
We'll discuss your vision, goals, and requirements to understand exactly what you need
Estimate & Proposal
I'll provide a detailed proposal and quote tailored to your specific project requirements
Development
Using cutting-edge technologies, I'll build your dream website, web app or mobile application
Launch
Your vision becomes reality as we deploy your perfect site and ensure everything runs smoothly
Ready to start your project?
Contact Me NowPROJECTS
👉 Click an image to enlarge it!
SOKAI MVP MOBILE
Mobile MVP concept for SOKAI focused on gamified football training, with a mobile-first interface designed to make the core user flows immediately readable during early product validation.
This version highlights key app moments: visual onboarding, mobile navigation, session tracking, and player progression in a UI shaped around sport, motion, and performance. The app is now live in production on the iOS App Store and the Android Play Store.
Used tools:
![[object Object] screenshot](/_next/image?url=%2Fprojects%2Fsokai%2Fsokai-landing.png&w=1920&q=75)
👉 Click the image to visit the site!
Sokai Club
Sokai Club is an AI-driven football training platform that gamifies real-life drills and exercises. Players earn NFT rewards and on-chain points as they improve their skills.
I designed and developed a modern, responsive landing page that showcases the platform's innovative features with clean animations and an engaging user experience.
Used tools:
![[object Object] screenshot](/_next/image?url=%2Fprojects%2Fsokai%2Fhome-betaapp.png&w=1920&q=75)
👉 Click the image to visit the site!
Sokai Beta App
The Sokai Beta App brings the AI-powered training experience to life. Train, compete, and track your progress in real-time with gamified football drills. AI exercise recognition was implemented by the CTO AI expert.
I handled the complete implementation: pixel-perfect design, all frontend pages, Supabase backend integration, and the entire Web3/blockchain layer including the smart contract that mints SBTs (Soulbound Tokens) as proof of play and metadata updates.
Used tools:
🛠 Web3 Proof-of-concepts
Most of these PoCs were built in under 48 hours during hackathons.
A hackathon is an intense coding sprint where developers, designers and builders collaborate to turn an idea into a working demo.
👉 Click on each video to explore the project — and check out the full code on GitHub!
Curious about the behind-the-scenes? Read my blog where I share the experience of building these apps.
📱 Mobile
🖥 Desktop
Freelance web development pricing
Indicative rates for my web development services. For e-commerce and other specialized solutions, please check the full pricing page.
🚀 WebAPP Startup Offers
Services designed to help you test your idea or launch quickly with maximum impact.
Proof of Concept
900€ - 1750€Rapid prototyping of a functional demo to test a core idea. Includes technical consulting, UX/UI mockups (basic), and pitch deck support to help communicate the vision. Ideal for hackathons or investor validation.
Minimum Valuable Product
1500€ - 3000€Development of a MVP with essential features for first users or early testers. Includes authentication, core logic, simple UI, and deployment. Ideal for pre-seed validation or startup acceleration.
Landing Page (Showcase Website)
400€ - 1000€Design and development of a responsive, SEO-friendly landing page. Includes animations, contact form, and third-party tools integration. No backend.
Mobile App
5000€ - 15000€Cross-platform mobile app using React Native or Flutter, tailored to your functional needs. The final price depends on the number and complexity of screens.
Web3 Decentralized Application (Dapp)
450€ / daySmart contracts, dApp development, and blockchain integrations (Solana, Ethereum, XRPL, etc.).
Web Application (Full stack)
450€ / dayFull-stack application with database integration, authentication flows, and advanced features.