Oleksii T.

Send me your project and I'll tell you honestly what it actually needs, web, mobile, or both, within minutes. I'm a Full Stack Developer with 6+ years of hands-on Flutter Mobile App Development experience, building web and mobile products as one system, not two separate handoffs. I've shipped 30+ Flutter projects, dozens of React Native apps, and 250+ mobile and web products across 45 countries. Not prototypes. Real apps with real traffic and real business logic. I own the outcome and manage the project myself. What makes me different Most teams hire a web developer, then a mobile developer, and spend months keeping them in sync. As a Full Stack Developer, I build the backend and frontend architecture that fits long-term. Through Flutter Mobile App Development and React Native, I extend that same codebase into iOS and Android apps, so web and mobile share logic instead of drifting apart. When a product genuinely needs it, I also handle native iOS Development in Swift and native Android App Development in Kotlin and Java. Full Stack & Web Development I build React, Vue.js, TypeScript, and JavaScript frontends, and Node.js backends with MongoDB, MySQL, or PostgreSQL, backed by PHP and Python where they fit, all under Git. SaaS platforms, multi-tenant admin dashboards, and customer-facing portals ready to grow with the business. Mobile App Development In Flutter Mobile App Development I build cross-platform apps for iOS and Android from a single codebase with 60fps performance. As a React Native Developer I build the same cross-platform reach when your team's stack points toward React Native instead. Custom mobile architecture, payment gateway integration (Stripe, Apple Pay, Google Pay), legacy app rescue, Mobile App Redesign, and App Store and Google Play deployment. AI Integration A growing part of my Full Stack Developer and Flutter Mobile App Development work is AI Integration: connecting web and mobile products to the OpenAI API, Claude API, and LangChain workflows, building RAG pipelines and AI agents that make features useful in production, not a demo. Recent Projects For a startup launching alongside their web app, I handled Mobile App Development for a React Native app on iOS and Android sharing the same backend as the web product, cutting duplicate work. For a FinTech client, I delivered Flutter Mobile App Development for iOS and Android from one codebase, handling Apple Pay and Google Pay without diverging logic. For a SaaS platform migrating from a single-tenant setup, I worked as Full Stack Developer restructuring the database schema for multi-tenancy without downtime. Results Across Full Stack Developer and Flutter Mobile App Development work, these are the outcomes clients typically see: Up to 60% faster app load times Up to 45-65% faster web load times on legacy codebases Up to 40% reduction in crash frequency 30-50% fewer manual operations through targeted automation 5x growth in active users sustained without downtime Tech Stack Flutter, Dart, Bloc, Provider, Riverpod, React Native, React, Vue.js, Node.js, TypeScript, JavaScript, Kotlin, Swift, Java, PHP, Python, MySQL, PostgreSQL, MongoDB, Git, REST, GraphQL, WebSockets, Firebase, Stripe, AWS, GCP, Azure, Docker, CI/CD, App Store, Google Play By Industry In Full Stack Developer and Flutter Mobile App Development roles, I've worked across SaaS, FinTech, Healthcare, EdTech, and eCommerce. SaaS is my primary focus, from early MVPs to enterprise systems with subscription management. In Healthcare I've delivered mobile and web projects with HIPAA in mind. FinTech projects include secure payment systems on web, Flutter, and React Native apps. How I work Discovery: defining goals and constraints before writing code, including whether the job needs a Full Stack Developer, Flutter Mobile App Development, React Native, or all three. Architecture: state management, system logic, and backend integration built for scale. Development: clean code across web and native screens, seamless API connectivity. Testing: performance under load and cross-device compatibility on real hardware. Launch: structured deployment with monitoring. I handle project management myself, so there's no handoff gap between the person writing the code and the person tracking the timeline. What you get A Full Stack Developer with Flutter Mobile App Development and React Native expertise who takes full ownership of architecture, code stability, and delivery. Every Flutter Mobile App Development engagement includes: Clear milestone breakdowns, no surprise delays Clean documented code your team can use Active project management from first sprint to release Post-launch support, not a goodbye As PM for our development team, I keep every project on schedule myself. Ready for Full Stack Developer and Flutter Mobile App Development work that builds web and mobile as one product, not two? Send me a message.