Pavlo S.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 Oct 16, 2026.

👋 𝐇𝐢, 𝐈’𝐦 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 & 𝐓𝐞𝐜𝐡 𝐋𝐞𝐚𝐝 𝐰𝐢𝐭𝐡 𝟕+ 𝐲𝐞𝐚𝐫𝐬 𝐢𝐧 𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭. I build production web applications from frontend and backend to APIs, databases, integrations, cloud infrastructure, and deployment. My core stack includes React, Next.js, Node.js, NestJS, TypeScript, PostgreSQL, MongoDB, AWS, and Docker. I also build AI-powered products and integrate AI agents, LLMs, RAG, and automation into existing SaaS platforms and business workflows. I can take ownership of the full product lifecycle: architecture, frontend, backend, third-party integrations, AI functionality, and production delivery. • 7+ years in software development and technical leadership • 100% Job Success on Upwork • AI systems automating 50-80% of repetitive manual workflows • ~1,000 recurring manual actions eliminated, saving 20-25 hours per week on a past project • Built production RAG system with hybrid retrieval and a 69-scenario regression suite • Full Stack ownership across AI, backend, frontend, databases, APIs, and cloud 📌 𝐒𝐄𝐑𝐕𝐈𝐂𝐄𝐒 • Full Stack development with React, Next.js, Node.js, NestJS, TypeScript, PostgreSQL, MongoDB, AWS, and Docker • AI agent development and agentic workflows with tool use, structured outputs, permissions, and human-in-the-loop approval • RAG systems, knowledge assistants, vector search, hybrid retrieval, grounding, and evaluation • AI automation with n8n, APIs, webhooks, CRM systems, and business tools • LLM integrations with OpenAI, Claude, Gemini, and other models • Conversational AI, AI assistants, lead qualification, sales automation, and internal knowledge systems • AI SaaS and AI-powered product development from architecture to production • API integrations, databases, authentication, dashboards, monitoring, and deployment 📌 𝐒𝐄𝐋𝐄𝐂𝐓𝐄𝐃 𝐀𝐈 𝐖𝐎𝐑𝐊 RAG Knowledge Assistant | Full Stack AI Product Built a production knowledge assistant that turns a verified company knowledge base into accurate answers for website visitors and supports lead qualification. Implemented hybrid retrieval, relevance thresholds, model fallbacks, Google Drive sync, moderation, and a 69-scenario regression suite. AI Sales Assistant | Full Stack SaaS & CRM Automation Built a system that combines conversation data, CRM records, company knowledge, and sales rules to qualify leads, recommend next actions, prepare responses, and manage follow-ups. Automated 50–80% of repetitive work and removed ~1,000 recurring manual actions. JedAI | Full Stack AI Agent Platform Worked on an AI-agent platform for turning business data into structured workflows for opportunity discovery, targeting, action monitoring, and impact measurement. Built agent flows, task configuration, history, generated files, and structured AI outputs. Creativio | AI SaaS & Generative AI Joined an existing SaaS product, refactored its architecture, migrated it to a new AI engine, and built a centralized editor for background removal, scene generation, inpainting, and upscaling. 💡 𝐖𝐇𝐀𝐓 𝐈 𝐇𝐄𝐋𝐏 𝐒𝐎𝐋𝐕𝐄 • build a Full Stack web application from MVP to production • develop React / Next.js interfaces and Node.js backend services • connect APIs, databases, CRMs, and external platforms • add AI functionality to an existing SaaS or web product • build AI agents and RAG systems around real business data • automate repetitive workflows across CRMs, APIs, and internal tools • reduce hallucinations and improve LLM reliability with grounding, validation, and evaluation • integrate AI into an existing SaaS product without rebuilding the platform • move an AI prototype into a maintainable production system You get senior Full Stack Developer ownership across React, Next.js, Node.js, NestJS, TypeScript, APIs, databases, AWS, and deployment, with strong hands-on experience in AI agents, RAG, LLM integration, and automation. I can join an existing team, own a specific part of the product, or take responsibility for the complete Full Stack architecture and delivery. 🚀 𝐋𝐄𝐓’𝐒 𝐓𝐀𝐋𝐊 Send me your product, technical requirements, or existing codebase. I’ll review the scope and suggest the most practical way to build or improve it. Keywords: full stack developer fullstack developer full-stack developer senior full stack developer full stack engineer full stack web developer react developer next.js developer node.js developer nodejs developer react node developer typescript developer javascript developer web application developer SaaS developer backend developer API developer REST API GraphQL PostgreSQL MongoDB NestJS React Node.js AWS Docker AI developer AI engineer AI agent AI automation n8n LLM RAG OpenAI AI integration