Kostiantyn Marchuk

I've delivered production backend platforms at Nettia OY and RenesandroAI, building Django, FastAPI, and Flask services from requirements through release and production support. At Nettia OY, I improved selected Django/DRF endpoint latency by approximately 30–40% and grew daily Google Search Console impressions from approximately 2,000 to 7,000.

At RenesandroAI, I led the migration of Flask services to FastAPI, improving API response times by about 35%, and built GCP infrastructure that reduced spend by about 30% through autoscaling and right-sizing. I also created a unified AI integration layer across OpenAI, Google Gemini, and media AI services, turning complex workflows into reliable product features.

I enjoy refactoring legacy systems into cleaner architectures, building reusable internal tooling, and partnering with QA and product teams to make software testable, observable, and maintainable. I'm looking to bring strong engineering fundamentals and end-to-end ownership to a Python Engineer role.