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Vasil S.
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Vasil S.

Full Stack Developer | Mobile Apps | Web Platforms | AI-to-Production

⭐ 50+ Apps Launched | Mobile, Web & AI-to-Production Specialist ⭐ Product-focused Mobile & Full-Stack Developer with 8+ years building production-ready applications for startups and enterprises. My work has been featured at leading global tech events including WebSummit, TechChill, and VivaTech. I've helped 50+ businesses transform ideas into polished products across App Store & Google Play, specializing in AI-enhanced development workflows and scalable architecture. 🏆 Recent Success Stories: ⭐ Launched event booking app (PlayFull) - 5K+ downloads in 3 months, 4.8★ rating ⭐ Built car executive platform with AI integration - reduced manual workflows by 60% ⭐ Developed financial app with minimalistic UX - increased user retention by 25% ⭐ Scaled MVPs to hundreds of thousands of users across multiple startups ⭐ Rescued 15+ "vibe-coded" prototypes and transformed them into production-ready products 🚀 What I Deliver: • Mobile Apps: Cross-platform (Flutter/React Native) & Native (Swift/Kotlin/SwiftUI) • Web Platforms: React.js, TypeScript, Node.js, Python/Django • Backend Systems: Scalable APIs, databases, cloud infrastructure • AI Integration: LLM-powered features, automation, intelligent workflows • Full Product Lifecycle: UX/UI design → Development → App Store launch → Post-launch support 🤖 AI-Enhanced Development & "Vibe Coding" Rescue I leverage modern AI tools (Cursor, Claude, GitHub Copilot) to accelerate delivery by 30-40% without sacrificing code quality. More importantly, I rescue "vibe-coded" prototypes. If you used AI agents to build an MVP but now face architectural dead-ends, bugs, or scaling issues, here's how I help: ✅ Refactor and stabilize AI-generated codebases ✅ Fix architectural issues and implement missing functionality ✅ Prepare products for real users and long-term growth ✅ Transform prototypes into maintainable, production-ready systems Instead of managing multiple specialists, you work with one experienced product partner who handles UX, development, architecture, and release while keeping your business goals at the center. 🎯 How I Can Help: 💼 Turn your mobile/web app idea into a market-ready product 🛠️ Rescue and productionize your AI-generated prototype 📈 Scale your MVP to handle hundreds of thousands of users 🎨 Design and build polished UX that increases user retention ⚡ Accelerate development cycles through AI-enhanced workflows 📋 Services I Provide: • Mobile App Development (iOS, Android, Cross-Platform) • Web Application Development (React, Node.js, Python) • Backend Architecture & API Development • AI Integration & LLM-Powered Features • UX/UI Design (Figma, Adobe XD) • MVP Development & Product Strategy • App Store & Google Play Publishing • Code Refactoring & Technical Debt Resolution • AI-Generated Code Stabilization • Performance Optimization & Scalability 🔧 Technical Stack: Mobile: Flutter, React Native, Swift, SwiftUI, Kotlin, iOS Development, Android Development Web: React.js, JavaScript, TypeScript, HTML5, CSS3, Responsive Design Backend: Node.js, Python, Django, PHP, REST APIs, GraphQL Databases: Firebase, PostgreSQL, MongoDB, SQL, NoSQL Design: Figma, Adobe XD, Sketch, Adobe Photoshop, Adobe Illustrator AI/ML: AI Development, AI Agents, ChatGPT Integration, OpenAI API, Claude, Cursor, GitHub Copilot DevOps: Git, CI/CD, App Store Deployment, Google Play Publishing 💼 Industry Experience: • Startups: MVP development, rapid prototyping, product-market fit • Healthcare Apps: Patient management, telemedicine, health tracking • Fintech: Payment processing, financial dashboards, security compliance • Logistics: Route optimization, fleet management, real-time tracking • E-commerce: Marketplace platforms, inventory systems, user experiences • SaaS Products: Multi-tenant architectures, subscription models, analytics 🎓 Credentials & Recognition: • 50+ mobile apps launched across App Store & Google Play • Featured at WebSummit, TechChill, VivaTech • Expert in AI-assisted development workflows 🌟 What Sets Me Apart: Unlike typical devs who focus only on code, I approach every project as a product partner. I combine technical expertise with business vision, ensuring that every feature we build serves your strategic goals. 🤝 Working With Me: I pride myself on clear communication, proactive problem-solving, and delivering beyond expectations. I'm available for both short- and long-term project. Every project includes detailed documentation, clean code, and post-launch support to ensure your success. Ready to turn your mobile app idea into a market-ready product? Let's discuss your project requirements and timeline. Invite me to your job, and let's jump on a quick call to audit your current app or discuss your roadmap.

🇱🇹Vilnius, Lithuania$33/hr100% JSS5.00 (8)Since Sep 2025

Earnings and projects

MRR
$118

Last 6 months ÷ 6

World#130,474 / 412k
🇱🇹Country#116 / 452
Revenue, last 30 days
$0

Last 6 months: $707

Total earnings
$2.1k

Billed in all: $2.2k

World#328,946 / 412k
🇱🇹Country#354 / 452
Per project
$264

$354 in the last 6 months

World#242,275 / 412k
🇱🇹Country#275 / 452
Projects, last 6 months
2
50% fixed50% hourly
World#88,922 / 412k
🇱🇹Country#89 / 452
Projects in all
8

Across 9 contracts

78% fixed22% hourly
World#223,563 / 412k
🇱🇹Country#251 / 452

Earnings, last 30 days

$2.2kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$2,150$2,175$2,200$2,225Oct 9Oct 24Nov 8

Skill rankings: Top 21% in Java

Ranked by MRR among everyone on Upwork with the skill.

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  2. #887Swift3,634 freelancers · 🇱🇹 #4Top 24%
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  5. #1,722Java8,313 freelancers · 🇱🇹 #5Top 21%
  6. #1,811Android App Development6,395 freelancers · 🇱🇹 #1Top 28%
  7. #1,949iOS Development6,533 freelancers · 🇱🇹 #3Top 30%
  8. #2,158Flutter7,550 freelancers · 🇱🇹 #3Top 29%