Senior Frontend Software Engineer (m/f/d) at InPost

We're building a platform — a unified system used organization-wide to manage and serve content for both web and mobile apps across all markets where InPost operates. The platform gives content editors a visual interface to build and publish pages. Behind the scenes, it's a TypeScript monorepo with a Next.js + PayloadCMS admin panel, an Astro SSR web renderer, and a custom shared design system. We are looking for a seasoned engineer (typically 4+ years building production frontend applications) who understands the complexities of working in a large, international organization. You aren't just a coder; you are a problem solver who understands how technical decisions impact global scalability, multi-market rollouts, and localization. You'll work at the intersection of product, design, and engineering. We expect you to bring experience from other mature organizations, challenge our ideas, and help us navigate the challenges of a multi-language, multi-region platform. We also believe AI is reshaping frontend development. We want someone who has already adapted—using AI tools naturally—and can help the team raise the bar. Your Responsibilities • Develop new features focusing on architecture, scalability, and internationalization standards • Take ownership of your solutions — you own the outcome and quality of what you build • Drive the evolution of our shared design system to support multiple brands and markets • Own accessibility (a11y) as a first-class concern across all our international sites • Build complex UI features: block-based editor interactions, undo/redo, and previews • Experiment with and integrate LLM-based tools into our products and workflows • Drive AI adoption within the team — help establish best practices • Work with strict TypeScript to design safe, ergonomic APIs • Maintain and extend our E2E test suite (Playwright) to ensure stability across regions • Mentor junior engineers and foster a culture of technical excellence • Participate in architectural decision-making — we use lightweight RFCs and collective ownership to align on technical direction