(Senior) Full-Stack Engineer | Frontend-leaning | Platform Team (f/m/d) | Berlin

bunch is building the backbone of private markets. We are enabling next-gen fund operations with one integrated system that combines secure data infrastructure, AI-powered workflows and expert fund services. If you value ownership, growth through real responsibility, and working with a thoughtful, ambitious team, this role might be for you. Your role You’ll join our Platform team as a Full Stack Engineer with a frontend focus , building the foundational product experiences and services that power bunch. We’re looking for someone who sees product development as a craft - a blend of technical excellence, user-centered thinking, and cross-functional collaboration. Whether you’re shaping frontend architecture, contributing to backend services, maintaining our Design System, or implementing features end to end, your work will have a direct impact on thousands of users managing billions in assets. We offer you freedom and ownership to build the right solutions and influence the product roadmap. Top responsibilities Build robust, scalable, and well-tested full-stack product features, with a strong focus on frontend quality, using modern frameworks and our in-house Design System Collaborate with PMs, Designers, QAs, and Engineers in the Platform Core team to ship high-quality features quickly Contribute to and evolve our frontend architecture, backend services, tooling, and design system Ensure a great developer experience and continuously improve performance, reliability, and maintainability across the stack Write meaningful unit and E2E tests Actively shape product solutions by participating in discovery, feedback rounds, and design critiques If you're applying as a Senior: Take ownership across the stack, with particular depth in the frontend domain, and influence platform-wide decisions Drive alignment between design and development, and collaborate on challenging UX cases Own and evolve our in-house Design System alongside the design team Guide the team in architecture and performance decisions Mentor and support other engineers About You To thrive in our Platform Core team, you combine a love for building excellent UIs with the ability to work confidently across the stack and a pragmatic, product-first mindset. You're a strong communicator, a team player, and someone who thrives in a growing, fast-paced environment where asking "why" is encouraged. You... Have 5+ years (Senior) of experience building product applications across the stack, with clear frontend depth Are fluent in TypeScript , comfortable with modern frontend frameworks, and able to contribute to Node.js backend services Have experience working with Design Systems for Senior: also experience building or maintaining custom ones Are familiar with unit and E2E testing (Vitest, Playwright, or equivalents) Understand UI/UX principles and care about building elegant, accessible, and usable interfaces Can operate in ambiguity and turn loosely defined ideas into working software Have experien