Vasilii I.

𝟗𝟎𝟎,𝟎𝟎𝟎 𝐜𝐥𝐢𝐞𝐧𝐭𝐬. 𝟏.𝟑𝐌 𝐢𝐧𝐯𝐨𝐢𝐜𝐞𝐬 𝐩𝐫𝐨𝐜𝐞𝐬𝐬𝐞𝐝 𝐦𝐨𝐧𝐭𝐡𝐥𝐲. 𝟏𝐌+ 𝐮𝐧𝐢𝐪𝐮𝐞 𝐮𝐬𝐞𝐫𝐬. 𝟐𝟏 𝐲𝐞𝐚𝐫𝐬 𝐭𝐮𝐫𝐧𝐢𝐧𝐠 complex requirements into clean, scalable products end-to-end. 𝑩𝑶𝑶𝑲 𝑨 𝑭𝑹𝑬𝑬 𝑪𝑨𝑳𝑳 - 𝑻𝑬𝑪𝑯 𝑪𝑶𝑵𝑺𝑼𝑳𝑻𝑨𝑻𝑰𝑶𝑵 𝑶𝑹 𝑪𝑶𝑫𝑬 𝑨𝑼𝑫𝑰𝑻 Need a production-ready MVP that ships on time and works flawlessly? I'm a senior full-stack engineer who builds complete products - mobile + web + backend + database + cloud - the kind of end-to-end ownership that reduces coordination overhead and delivers reliable software fast. What sets me apart: genuine depth across the full stack - Flutter/Dart mobile, Angular web, ASP.NET Core/C# backend, PostgreSQL/MSSQL data, Azure infrastructure. I've built government utility platforms processing 1.3M+ invoices monthly, banking systems serving 900K+ clients, and consumer apps at 1M+ monthly users. I know both the user experience and the server architecture that keeps it running under real load because I build both. Here's what I can build for you: 📱 Cross-platform Flutter apps for iOS and Android (Bloc, Provider, REST API, OAuth, WebSockets) 🔧 .NET / ASP.NET Core backend APIs and microservices 🗄️ Founder-led MVPs - complete product from concept к App Store / production launch 🌐 SaaS platforms - multi-tenant + multi-role + Stripe subscriptions + admin dashboards ☁️Multi-stakeholder marketplaces - customer/provider/admin platforms + payments + workflows 🔍 Legacy modernization - .NET conversion + refactor + performance optimization + long-term ownership ✅ Top Rated on Upwork - 5.0 rating across all completed contracts ✅ Solo senior, every line of code written by me, single point of contact throughout engagement ✅ 21+ years of professional software development Not sure where to start? 𝑩𝒐𝒐𝒌 𝒂 𝒇𝒓𝒆𝒆 𝒄𝒂𝒍𝒍 - I'll audit your codebase or talk through your idea, no obligation.