Andrii C.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I combine 17+ years of enterprise engineering with modern AI tooling to execute complex migrations, integrate smart features, and resolve deeply rooted technical debt in a fraction of the traditional time. I don't just clear Jira tickets - I take true ownership of your product. Whether I am architecting a new feature or untangling a decade-old legacy system, I care deeply about code quality, security, and your bottom line. I treat your business goals as my own. What I Deliver: - AI-Accelerated Migrations & Refactoring: Using advanced AI coding agents (Claude, Copilot, MCP) alongside deep architectural knowledge, I execute large-scale framework migrations, full-codebase modernizations, and tech-debt removal. What used to take months of manual labor is now delivered rapidly, saving you massive amounts of development budget. - Production-Ready AI Integrations: I build reliable, secure AI features directly into your existing platforms. From custom RAG (Retrieval-Augmented Generation) pipelines and autonomous agents to intelligent search and contextual chatbots, I bridge the gap between LLMs and your proprietary data. - Enterprise Performance & Scalability: My foundational specialty. I turn sluggish, expensive applications into lightning-fast experiences. I optimize database bottlenecks, reduce bundle sizes, and restructure cloud architecture to handle massive traffic spikes while actively lowering your server costs. Recent Proven Results: ✅ Executed a legacy multi-tenant SaaS migration, reducing enterprise client onboarding time from 1.5 months to just 2 days. ✅ Optimized a high-traffic 2M+ user platform, slashing load times from 8 seconds to 0.4 seconds. ✅ Audited and restructured AWS infrastructure, cutting hosting costs by 60% while successfully supporting 3x more traffic. ✅ Maintained a 100% Job Success Score across 50+ delivered projects. If you need a senior technical partner who can securely migrate your aging codebase, drastically improve your app's performance, or wire modern AI into your SaaS platform, let's talk. Top Rated | 100% Job Success Score | Immediate availability for the right project. Tech Stack, Methodologies & Search Keywords: - AI & Machine Learning: LLM Integration, RAG (Retrieval-Augmented Generation), Vercel AI SDK, OpenAI API, Anthropic Claude API, Prompt Engineering, Vector Databases, MCP (Model Context Protocol), AI Agents, LangChain. - Backend & Architecture: Node.js, PHP, Laravel, Symfony, Python, RESTful APIs, Microservices Architecture, Multi-tenant SaaS, Legacy System Modernization, Codebase Migration, WebSockets, OOP, SOLID Principles. - Frontend Development: React.js, Next.js, Vue.js, TypeScript, JavaScript (ES6+), React Native, SPA, PWA, Tailwind CSS, Webpack, Responsive Design. - Databases & Search: PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch, Manticore/Sphinx Search, Database Design, Query Optimization, Sharding, Data Migration. - Cloud, DevOps & Infra: AWS (Certified Cloud Practitioner), Docker, CI/CD pipelines, Serverless, Auto-scaling, Load Balancing, Linux Server Administration, Cloud Cost Reduction. - Performance & Metrics: Core Web Vitals Optimization, Website Speed, GTmetrix, Lighthouse, Page Load Time reduction, Caching Strategies, Technical SEO, Memory Leak Debugging.