Rostyslav Ryzhkov

I’m a Software Developer specializing in backend development, AI automation, and production-ready applications. I build robust Python and Node.js backend services, REST APIs, and full-stack features that move from concept to production.

In my current role at HelpU, I developed backend APIs and business logic with Node.js, Express, TypeScript, PostgreSQL, and REST APIs. I built end-to-end booking workflows with role-based access control, real-time booking messaging, configurable pricing, platform fees, earnings calculations, and multilingual support.

I also contributed across the full application stack using React, TypeScript, Node.js, and PostgreSQL. I collaborate in Agile using Git, pull requests, code reviews, Jira, sprint planning, and production release validation, and I diagnose and resolve production issues with Docker-based deployments.

On the project side, I’ve shipped production MVPs like ExpensesAI with OpenAI Vision for structured receipt extraction, multilingual support, dashboards, exports, and a Dockerized Ubuntu VPS setup. I also built an AI booking assistant with FastAPI, PostgreSQL, OpenAI Tool Calling, SQLAlchemy, Alembic, and Pytest—focused on maintainable architecture, reliable persistence, and testable workflows.