Senior Front-end Developer

I own front-end initiatives for an AI-first product, translating ambiguous ideas into implementation-ready specifications, including user flows, edge cases, and acceptance criteria, and taking features through production release.

I design reusable component APIs and design-system foundations shared across more than four internal applications. I collaborate with backend and AI teams on REST API contracts and behavior, and use unit, component, and end-to-end testing in CI to ensure delivery quality.

I work with agentic and spec-driven workflows using Claude Code and Cursor, while critically reviewing generated output for correctness, performance, accessibility, and architectural fit.

I owned front-end delivery for more than six client products, covering requirements, technical planning, implementation, quality assurance, and production releases.

I built and maintained automated test suites using Testing Library and Playwright, diagnosed page-load and rendering performance issues, and monitored production with Sentry to resolve front-end and back-end behavior differences.

I worked directly with clients, product stakeholders, and designers to resolve UX and scope trade-offs. I also ran technical interviews and helped establish Cloud Nine's Polish team as its first Polish employee.

I developed customer-facing and internal front-end applications for the iGaming industry, focusing on performance, usability, and reliability.

I built an internal React data-management platform for a catalogue of thousands of casino games, establishing reusable patterns that supported scalability and performance.

I led the migration of the main legacy JavaScript application to React and Next.js, collaborating with design and product stakeholders to deliver consistent user experiences.

I owned the UX, visual implementation, front-end architecture, and CMS integration for a new Russell Hobbs website.

I created a scalable front-end foundation intended to support future e-commerce expansion and ongoing digital growth.

I also produced campaign assets, newsletters, banners, and digital advertising, translating brand and content requirements into consistent responsive digital experiences.

I designed and developed websites for Cocogreen and Zoobedding, combining front-end implementation with brand and visual design.

I created an in-house JavaScript solution that automated the generation of technical PDF drawings, reducing manual work and improving internal workflow efficiency.

I also produced newsletters, banners, and advertisements to support digital marketing and campaign activity.

IT Specialist profile. Location: Gdańsk, Poland.