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Alexander Kolesnikov

@alexanderkolesnikov

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I build high-load backend, AML/KYC, and AI-powered products from end to end.

Poland

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What I'm looking for

I'm looking to build high-impact backend, RegTech, or AI products where I can own architecture, ship reliable APIs, and apply AI-first engineering from design through production.

I've built production AML/KYC platforms and APIs at Coinfirm, including automated Dow Jones PEP and sanctions screening, identity flows, and onboarding capabilities.

At Travelplanet.pl, I built a DDD travel-booking API and Go/PHP microservices for international teams, improving platform integration through SQL optimisation, refactoring, CI/CD, and observability.

I also build AI-first products end to end, including Sanqto, a sub-30 ms sanctions-screening platform, AlexChange payment automation, and Clippy, a macOS clipboard manager delivered through multi-agent development.

Experience

Work history, roles, and key accomplishments

Senior Backend Developer

Travelplanet.pl (Invia / Wirtualna Polska Holding)

Oct 2023 - Jun 2026 (2 years 8 months)

Built a new DDD travel-booking API and stabilized its integration with the wider e-commerce platform. Worked on Go and PHP microservices in the booking domain, with gRPC, GitLab CI/CD, Kubernetes/Helm, and observability tools.