Hi, I'm

Yevhen
Kotliarchuk

Fullstack Software Engineer

I deliver backend-heavy products end to end — from API design and third-party integrations to the interface that makes them usable. I turn complex business flows into maintainable systems that stay reliable under real production load.

Based in Krakow Working globally EN · UK · PL

Experience

Software Engineer

Softcery

Backend-heavy full-stack engineering across NDA projects in marketing, travel, and fintech. Delivered analytics and platform integrations, stabilized checkout and fraud-related systems in a legacy fintech stack, and improved delivery reliability across changing client requirements. Also supported engineering workflow improvements for legacy codebases.

Software Engineer

B2B Grocery Ordering Platform

Delivered a B2B ordering platform for a German grocery supplier end to end as a solo engineer — landing page, ordering flow, backend architecture, and automated invoicing via Fakturownia.pl. Shipped the MVP in about two weeks on a fixed contract, then proposed and built accounting-automation tooling that cut the client's recurring manual work.

Backend Developer

BYFL.team

Owned the NestJS backend in a startup environment, driving API design, code reviews, and release quality. Coordinated closely with frontend, iOS, and Android teammates across a long engagement to keep cross-platform releases shipping in sync as contracts and integrations shifted.

Software Engineer

CML Team

Delivered CRM product work on Next.js with measurable wins in page load, build time, and long-standing UI bugs that had resisted prior attempts. Also supported a fintech/blockchain track covering KYC flows and smart-contract development on NestJS, and wrote minimal-dependency scrapers for large-scale data collection.

Fullstack Developer Intern

Binary Studio Academy

Shipped the SmartSpend expense-tracking fintech project across both frontend and backend. Earned review responsibility for other interns' code and communicated directly with program stakeholders to turn feedback and requirements into concrete changes.

Let's build something reliable together.

I'm a fullstack engineer focused on backend-heavy products. Happy to talk about interesting engineering problems, new opportunities, or just swap notes on systems that need to stay up.

Email me