Mykyta Y.

I build production backends and ship AI features into them: Django/DRF and FastAPI APIs, LLM and agent integrations, payment and billing systems. 5+ years from first commit to production and long-term support. Code ships with tests, Docker, CI and monitoring, not as a demo. What I take on: • AI integration into existing products: LLM features, agent workflows, MCP servers and tool APIs, RAG over your data. Claude and OpenAI APIs, FastMCP, structured outputs, evals. • Backend and APIs: Python 3.12, Django, DRF, FastAPI, Celery, PostgreSQL, Redis, Docker, AWS. Billing, subscriptions, payments, reconciliation, third-party integrations, real-time (WebSockets, background workers). • Full-stack delivery when you need one person end to end: React + TypeScript + Tailwind, Telegram Mini Apps, iOS (Swift). • Stabilizing legacy code: performance, refactoring, test coverage, before it slows your product down. Recent work: • Telegram Mini App for creator subscriptions: TON payments (TON Connect + custodial balance), video via Cloudflare Stream with HLS, KYC and moderation flow, referral system, GA4. Fixed-price MVP, kickoff to production in 4 weeks. • MCP server for a utility-billing company: investigation and debugging tools over a microservice architecture (Grafana, logs, databases), used by the engineering team and by AI agents. • Billing backend for an energy supplier: contracts, standing charges, bulk pricing updates from Excel, Celery pipelines, Django admin workflows. • Personal-finance product: budgets, transaction categorization, crypto exchange integration (MEXC), native iOS app. How I work: scope in writing before kickoff, milestones with demos, daily async updates, PRs with tests. Early warning if anything threatens the timeline. I take technical ownership when needed: architecture decisions, code review, unblocking and mentoring your team. I say no to scope that will not ship. I work directly with founders and product teams. Not an agency, no subcontracting. Available 30+ hrs/week, overlap with EU and US East hours. Send me the job post or a short description and I will reply with questions and a plan within a day.