Serghey D.

Full-stack developer building production backends, payment systems, and AI-integrated tools. I work primarily with Python (FastAPI), TypeScript/React, PostgreSQL/Supabase, and Stripe — with hands-on Claude API integration when AI belongs in the stack, not bolted on. I ship the parts of a system that have to actually work in production: payments and webhooks, auth and access control, API integrations, deploys, and the backend logic underneath. I build for reliability — not demos. Recent production work: - Member portal with Stripe subscriptions, Apple Pay, multi-currency checkout, and Supabase- gated access. FastAPI + PostgreSQL + Railway, 5★ verified delivery - Market-data MCP server for Claude Desktop and agent clients — workflow-shaped tools, FastMCP, open source on GitHub - TradingView → Claude → Telegram approval pipeline for AI-assisted decisions with human-in-the-loop confirmation - Bybit futures bot suite: multi-symbol live execution, ATR trailing stops, backtest engine, parameter optimizer - Pine Script indicators with multi-timeframe logic and webhook integration for automated alert delivery Specialized in trading systems and Claude/MCP integration, but the core skill is shipping backends that don't break. If you're building a SaaS, integrating Stripe, wiring Claude into a workflow, or automating a trading system — happy to talk.