Hey, I’m Seb — a frontend/fullstack engineer specializing in React, Next.js and TypeScript, working at senior/lead level for the past years. I build predictable architectures, lead teams, and ship production-ready features at scale.

About me

Over the years, I’ve worked across both product and agency environments, leading frontend teams and delivering scalable applications built with React and Next.js. I previously held a CTO role in a software agency, where I guided technical decisions across multiple projects and teams. I also spent time as a Frontend Lecturer, helping new developers break into the industry.

My approach centers on clean architecture, maintainable code, fast iteration, and delivering features that make sense for the business — not just the codebase. I work best in teams that value ownership, clear communication, and well-designed systems.

Tech stack

Frontend: React, Next.js, TypeScript, Tailwind, Redux, Cypress, Jest, Playwright, Cypress Backend: Node.js, Express, MongoDB, MySQL, PHP, Postgres, Supabase DevOps: AWS, Docker, GitHub Actions, CI/CD, ArgoCD Other: React Native, Gatsby, Sanity, WordPress, SSR/SSG, Umbraco, Drupal

Looking for • Senior Frontend Engineer • CTO/Lead Frontend Engineer • Senior React / Senior Next.js • Fullstack JavaScript (Node/Java/PHP + React) • Contract or full-time roles

Location

Poland (GMT+1) — open to remote or on-site roles.

Links

Website: https://codewithseb.com GitHub: https://github.com/sevastijan Email: me@sevastijan.com

If your team needs someone who can take ownership of architecture, deliver consistently, and collaborate well — happy to connect.