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👋 𝐎𝐥á! 𝐈'𝐦 𝐒𝐲𝐞𝐝 𝐒𝐮𝐟𝐢𝐚𝐧: 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫, 𝐚𝐧𝐝 𝐔𝐈/𝐔𝐗 𝐃𝐞𝐬𝐢𝐠𝐧𝐞𝐫. For over 6 years, I have helped businesses and startups across the globe design and develop efficient, scalable digital products from mobile applications to web platforms. I combine design thinking with clean, future proof development to deliver solutions that not only function well but also offer excellent user experience. 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐈 𝐎𝐟𝐟𝐞𝐫: 🔹𝐔𝐈/𝐔𝐗 𝐃𝐞𝐬𝐢𝐠𝐧 (𝐅𝐢𝐠𝐦𝐚, 𝐀𝐝𝐨𝐛𝐞 𝐗𝐃, 𝐒𝐤𝐞𝐭𝐜𝐡) Crafting intuitive and responsive user interfaces for websites and mobile apps, with a focus on usability and conversion. 🔹𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Custom websites, and web applications with MERN Stack, PHP, Laravel, Next.js, and more. 🔹𝐅𝐥𝐮𝐭𝐭𝐞𝐫 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Cross-platform mobile applications with smooth performance and modern UI for iOS and Android. 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐀𝐩𝐩𝐫𝐞𝐜𝐢𝐚𝐭𝐞 𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 𝐌𝐞? ✔️ 𝐌𝐮𝐥𝐭𝐢𝐝𝐢𝐬𝐜𝐢𝐩𝐥𝐢𝐧𝐚𝐫𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞– Design, frontend, and backend — all under one roof. ✔️ 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬-𝐎𝐫𝐢𝐞𝐧𝐭𝐞𝐝– I design with your goals in mind: conversions, engagement, or user satisfaction. ✔️ 𝐑𝐞𝐥𝐢𝐚𝐛𝐥𝐞 𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧– I maintain smooth communication and provide regular progress updates. ✔️ 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 & 𝐂𝐥𝐞𝐚𝐧 𝐂𝐨𝐝𝐞– All code is written with performance and long-term scalability in mind. If you're looking for a dependable professional to help launch your next web or mobile app — let's connect.🚀 ________________________________________________________________________

I build high performing Mobile Apps for ambitious brands. If you need a reliable Mobile App Developer or Flutter Developer, I deliver results as a dedicated Cross-Platform Developer, iOS Developer, and Android Developer. Buggy interfaces, crashing screens, and messy State Management are killing your user retention and eating into your profit margins. Let me fix that. I specialize in iOS & Android Development that scales, using a rigorous, manual coding approach to ensure rock-solid Mobile Architecture. I do not rely on brittle, auto-generated AI shortcuts; I build the foundational infrastructure from scratch so your product actually works and scales without breaking. Whether you need immediate Technical Debt Rescue for a stalled app, intensive Legacy Code Refactoring, or rapid MVP Development engineered correctly from day one, I deliver Custom Mobile Solutions focused on flawless user experiences and App Performance Optimization. Here is how I drive real business results through clear, high-quality app development: Bringing your new app idea to life: Starting entirely from scratch? I take your vision and build a rock-solid app from day one. Instead of rushing a messy prototype, I write clean, custom code from the ground up so you launch a polished product that actually works saving you from expensive rewrites down the road. Making it easy for users to pay you: I build smooth, simple checkout screens and subscription setups. If your payment process is frustrating, people will leave without buying. I fix those roadblocks so your app generates reliable revenue and you stop losing sales at the finish line. Fixing broken apps to save your ratings: Have an app that crashes, lags, or freezes constantly? Users will delete it and leave bad reviews. I step in to rescue messy code and clean it up from the inside out. The result is a stable, crash-free app that keeps your users happy and protects your brand's reputation. Building fast apps that grow with you: Nobody likes a slow app. I write solid infrastructure by hand without relying on lazy AI shortcuts so your product stays lightning-fast. Whether you have a hundred users or a hundred thousand, your app will feel smooth, responsive, and ready for growth. Stop losing users to slow load times and broken features. Message me with your biggest current app bottleneck or your Figma design link, and I will give you a free, straightforward technical assessment on exactly what it will take to fix it or launch it. Keywords: Senior Mobile Developer, Flutter Architect, Dart FFI, iOS Swift, Windows Desktop, macOS Native, Clean Architecture, BLoC Pattern, Supabase, CI/CD, App Performance, Technical Debt Rescue.Mobile App Developer, Flutter Developer, iOS and Android App Development, Cross-Platform Developer, Mobile Apps, Mobile Architecture. Senior Mobile Developer, MVP Development, App Performance Optimization, Firebase Integration, Supabase Expert, CI/CD Pipelines, GitHub Actions, Legacy Code Refactoring,Flutter Architect, Clean Architecture, BLoC Pattern, State Management, Dart FFI, C++ Integration, Desktop App Development, Technical Debt Rescue.

Hi! I'm Oleg, from Portugal 🇵🇹. I build AI Agents that handles 300+ support cases/day, and apps that raised $6M+. 47 projects shipped: production AI agents, RAG systems and AI SaaS that make money ABOUT ME "You built an interesting project in very short time." Saket Agarwal (Director of Engineering at Salesforce), CTO at evluv 10+ years, $600K+ earned on Upwork, 10,472+ hours billed. Top Rated Plus. AI Agent Developer & AI Automation Developer. What is running in production right now: ✅ Healify: AI health companion. Idea to production MVP in 6 months, ~$2M raised ✅ 300+ chats/day on a RAG support and lead-gen chatbot for a UK energy company ✅ 100K+ documents through RAG and OCR pipelines — invoices and bills of lading for port logistics ✅ 6M+ users on RL Garage, cross-platform mobile app ✅ Production AI support agent on LangChain — intent classification, structured tool calling, multi-turn regression evals in LangSmith, and a full compliance pass for a regulated subscription business ✅ Self-hosted RAG over engineering drawings — SVG/DXF parsing, vector retrieval, knowledge-graph layer for auditable answers with citations ✅ AI voice agent — inbound and outbound calls, lead qualification, appointment booking, CRM-connected ✅ 10,000+ active users on a multi-tenant AI SaaS platform — Stripe billing, RBAC, row-level security ✅ 25+ AI automation workflows (LanChain, Agents SDK) wiring AI agents into CRMs, Slack, Telegram and WhatsApp 💬 3 of my last 3 paid consultations turned into ongoing projects WHERE I DELIVER AI Agent Developer, 25+ agent built: custom AI agents and agentic systems with LangChain, LangGraph and MCP: tool calling, multi agent workflows, error handling, observability, evals, production deployment. AI Mobile Developer, 6M users, mobile AI apps and MVPs on React-Native, Next.js, Node.js, Python FastAPI, Supabase and Stripe billing. Idea to production in 6-12 weeks. AI Chatbot Developer, 300+ chats/day: RAG chatbots and AI assistants for customer support and lead generation: WhatsApp, Telegram, web widgets, CRM integrations, human handoff. MCP Developer, 5+ platform integrations: custom MCP servers connecting your APIs, databases and internal tools to Claude Desktop, ChatGPT and Cursor. RAG Developer / LLM Developer — retrieval pipelines with pgvector and Pinecone: embeddings, hybrid search, reranking, grounded answers with citations. Generative AI Developer / Python AI Developer — OpenAI API and Anthropic Claude API integrations inside existing products, without breaking what already works. INDUSTRY IMPACT AI SaaS Platform, AI Chatbot SaaS, RAG Knowledge Base — 10,000+ users, subscription and usage-based billing, 99.9% uptime. Document Automation, Document Intelligence, OCR AI — 2K+ documents processed, 90%+ manual work reduction in port logistics. Ecommerce Chatbot, WhatsApp Automation, Customer Support AI — 300+ chats/day with lead capture and human handoff. Healthcare AI, Real Estate AI, Fintech MVP, EdTech AI — AI agents, RAG systems and AI SaaS delivered across regulated and non-regulated domains. Voice-to-Book AI App, Cross-Platform Mobile AI — 5.0 stars on App Store and Google Play, shipped solo as an AI application developer. HOW I BUILD 25+ agent builds: langchain, langgraph, mcp server, tool calling, function calling, multi agent systems, agentic workflows, prompt engineering, rag pipeline, retrieval augmented generation, langsmith evals. 15+ platforms: nextjs, react, typescript, nodejs, python fastapi, supabase, postgres, pgvector, pinecone, stripe, aws, azure, vercel. 10+ bots: whatsapp chatbot, telegram bot, conversational ai, knowledge base chatbot, customer support ai, openai api, anthropic claude api, gpt-5. One full stack AI developer, no hand-offs: agent logic, RAG layer, backend, frontend, deployment, and the evals that prove it still works next month. 🤝 HOW WE START Need an AI developer who actually ships? Shoot me a message or invitation and I'll send you a personalised loom on how I can help!

🚀 Is your MVP taking months instead of weeks? 💡 Tired of hiring a Front End Developer who doesn't understand your business and just writes code? I'm a Front End Developer helping startup founders launch production-ready MVPs in 𝟮–𝟯 𝘄𝗲𝗲𝗸𝘀, using a clear, 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀-𝗼𝗿𝗶𝗲𝗻𝘁𝗲𝗱 development approach. As an Upwork Expert-Vetted React Front End Developer with a Master's in Computer Science and 7+ years of experience building scalable SaaS platforms, dashboards, and custom APIs, I translate complex tech into clear product decisions that drive results. Over those years as a Front End Developer I've worked with startups from idea stage to Series B, as well as enterprise clients like 𝗦𝗮𝗺𝘀𝘂𝗻𝗴, 𝗛𝗼𝗿𝗶𝘇𝗼𝗻𝘀, and 𝗕𝗲𝗻𝘁𝗹𝗲𝘆 - always focusing on fast delivery, clean architecture, and measurable outcomes. 💬 Here's what founders say after working with me as their Front End Developer: "𝘎𝘳𝘦𝘢𝘵 𝘦𝘹𝘱𝘦𝘳𝘪𝘦𝘯𝘤𝘦 𝘸𝘰𝘳𝘬𝘪𝘯𝘨 𝘸𝘪𝘵𝘩 𝘒𝘺𝘳𝘺𝘭𝘰! 𝘏𝘦 𝘥𝘦𝘭𝘪𝘷𝘦𝘳𝘦𝘥 𝘢 𝘩𝘪𝘨𝘩-𝘲𝘶𝘢𝘭𝘪𝘵𝘺 𝘙𝘦𝘢𝘤𝘵 + 𝘛𝘺𝘱𝘦𝘚𝘤𝘳𝘪𝘱𝘵 𝘧𝘳𝘰𝘯𝘵𝘦𝘯𝘥 𝘴𝘵𝘺𝘭𝘦𝘥 𝘸𝘪𝘵𝘩 𝘛𝘢𝘪𝘭𝘸𝘪𝘯𝘥 𝘊𝘚𝘚, 𝘣𝘶𝘪𝘭𝘵 𝘸𝘪𝘵𝘩 𝘤𝘭𝘦𝘢𝘯 𝘤𝘰𝘥𝘦 𝘢𝘯𝘥 𝘴𝘵𝘳𝘰𝘯𝘨 𝘢𝘵𝘵𝘦𝘯𝘵𝘪𝘰𝘯 𝘵𝘰 𝘥𝘦𝘵𝘢𝘪𝘭. 𝘊𝘰𝘮𝘮𝘶𝘯𝘪𝘤𝘢𝘵𝘪𝘰𝘯 𝘸𝘢𝘴 𝘴𝘮𝘰𝘰𝘵𝘩 𝘢𝘯𝘥 𝘥𝘦𝘭𝘪𝘷𝘦𝘳𝘺 𝘰𝘯 𝘵𝘪𝘮𝘦 - 𝘩𝘪𝘨𝘩𝘭𝘺 𝘳𝘦𝘤𝘰𝘮𝘮𝘦𝘯𝘥!" "𝘒𝘺𝘳𝘺𝘭𝘰 𝘥𝘦𝘭𝘪𝘷𝘦𝘳𝘦𝘥 𝘤𝘭𝘦𝘢𝘯, 𝘴𝘤𝘢𝘭𝘢𝘣𝘭𝘦 𝘤𝘰𝘥𝘦 𝘢𝘯𝘥 𝘩𝘢𝘯𝘥𝘭𝘦𝘥 𝘧𝘳𝘰𝘯𝘵-𝘦𝘯𝘥 𝘥𝘦𝘷𝘦𝘭𝘰𝘱𝘮𝘦𝘯𝘵 𝘸𝘪𝘵𝘩 𝘱𝘳𝘦𝘤𝘪𝘴𝘪𝘰𝘯. 𝘊𝘰𝘮𝘮𝘶𝘯𝘪𝘤𝘢𝘵𝘪𝘰𝘯 𝘸𝘢𝘴 𝘴𝘮𝘰𝘰𝘵𝘩, 𝘢𝘯𝘥 𝘩𝘦 𝘸𝘢𝘴 𝘱𝘳𝘰𝘢𝘤𝘵𝘪𝘷𝘦 𝘪𝘯 𝘴𝘰𝘭𝘷𝘪𝘯𝘨 𝘵𝘦𝘤𝘩𝘯𝘪𝘤𝘢𝘭 𝘤𝘩𝘢𝘭𝘭𝘦𝘯𝘨𝘦𝘴. 𝘏𝘪𝘨𝘩𝘭𝘺 𝘳𝘦𝘤𝘰𝘮𝘮𝘦𝘯𝘥𝘦𝘥 𝘧𝘰𝘳 𝘸𝘦𝘣 𝘥𝘦𝘷𝘦𝘭𝘰𝘱𝘮𝘦𝘯𝘵, 𝘈𝘗𝘐 𝘪𝘯𝘵𝘦𝘨𝘳𝘢𝘵𝘪𝘰𝘯, 𝘢𝘯𝘥 𝘱𝘦𝘳𝘧𝘰𝘳𝘮𝘢𝘯𝘤𝘦-𝘧𝘰𝘤𝘶𝘴𝘦𝘥 𝘦𝘯𝘨𝘪𝘯𝘦𝘦𝘳𝘪𝘯𝘨 𝘱𝘳𝘰𝘫𝘦𝘤𝘵𝘴." "𝘏𝘢𝘱𝘱𝘺 𝘸𝘪𝘵𝘩 𝘴𝘱𝘦𝘦𝘥 𝘢𝘯𝘥 𝘲𝘶𝘢𝘭𝘪𝘵𝘺!" Why founders keep me as their long-term Front End Developer: 🎯 Business-first mindset - a Front End Developer who understands your priorities and aligns tech decisions with them ⚙️ Rapid MVP execution - from concept to launch in weeks, not months 🧩 Front End ownership - a senior Front End Developer handling React, Next.js, API integrations, Tailwind, MUI and scalable architectures 🧩 Full Stack ownership - MERN, Express.js, Node.js, MongoDB 🧠 Strategic guidance - more than a Front End Developer: I help you define what truly matters for your first release 📌 Typical projects I take on as a Front End Developer: SaaS dashboards and admin panels - React Front End Developer work with complex state and data-heavy UI MVPs from Figma to production - a Front End Developer who ships, not just prototypes Custom API integrations and internal tools for growing teams Frontend rescue - stepping in as the new Front End Developer on an existing codebase I don't take on last-minute fixes or e-commerce stores - as a Front End Developer I focus on SaaS and MVP projects where clear product thinking makes the difference. If you're a founder looking for a reliable Front End Developer who speaks your language and delivers predictably - let's build something great together. 🛠️ Tech Stack & Tools: Languages & Libraries: React, React.js, Node.js, JavaScript, ReactJS TypeScript, ReactJS NodeJS, Python, PHP, React Native, NextJS, MERN Stack Styling: Material UI, Tailwind CSS, MUI React, custom SCSS / CSS Build Tools: Webpack, Vite, NPM UI/UX: Figma, Frontend Design tools for pixel-perfect visuals Visualization: Leaflet, maps & data-driven charts Databases: MongoDB, PostgreSQL, MySQL, Firebase State Management: Redux, Zustand, RTK Query Cross-browser / cross-platform manual testing