(Senior) Full Stack Developer - Web (f/m/d)

Join us as a (Senior) Full Stack Developer - Web (f/m/d) in Berlin. We are looking for a Senior Full Stack Developer to help shape and scale think-cell’s web platform and enable multiple teams to efficiently manage and publish content. You will work across frontend and backend, improve the technical foundation of our web platform, and help us build scalable solutions.

• Design, build, and evolve our web platform features across front-end and CMS back-end.
• Solve complex technical problems in a pragmatic way, balancing speed of delivery with long-term maintainability.
• Drive architectural improvements that make our web ecosystem more robust, scalable, and easier to work with.
• Build and improve our back-end functionality in PHP and Laravel for integrations, dynamic features, and internal tooling.
• Extend and optimize our CMS and publishing workflows to support efficient content operations without compromising technical quality.
• Improve performance, Core Web Vitals, accessibility, and technical SEO foundations across the platform.
• Work on the evolution of our current web architecture, while also challenging existing approaches when better solutions exist.
• Collaborate with design, marketing, product, and engineering teams to turn business requirements into well-structured technical solutions.
• Interface with back-end systems written in C++, ensuring reliable and efficient data exchange across system boundaries.
• Identify opportunities to improve developer experience, reduce complexity, and raise the overall engineering standard of the platform.
• Take ownership of technical tasks and help define best practices for modern web development at think-cell.

• Strong experience building and shipping production-grade web platforms, applications, or systems.
• A proven ability to solve non-trivial technical problems and work confidently in complex web related codebases.
• Strong full stack engineering skills, with solid backend experience in PHP, Laravel, or similar technologies and frameworks.
• Strong frontend fundamentals, including HTML, CSS, JavaScript and modern approaches to building maintainable user interfaces.
• Good judgment when making architectural and technical trade-offs.
• A pragmatic mindset: you know when to build for flexibility and when to keep things simple.
• Curiosity and confidence to work with unfamiliar technologies or domains when needed.
• A strong sense of ownership and responsibility for code quality, maintainability, and technical outcomes.
• Experience collaborating across disciplines and communicating clearly with technical and non-technical stakeholders in English.