Senior Full-Stack Engineer (Frontend focus) – Remote (Spain)

About the role

You’ll join the Platform team as a Full‑Stack Engineer with a frontend focus, building the foundational product experiences and services that power bunch. We look for someone who treats product development as a craft, blending technical excellence, user‑centered thinking, and cross‑functional collaboration.

Key responsibilities

• Build robust, scalable, well‑tested full‑stack features with a strong emphasis on frontend quality using modern frameworks and our in‑house Design System.
• Collaborate with product managers, designers, QA engineers, and other engineers to ship high‑quality features quickly.
• Contribute to and evolve frontend architecture, backend services, tooling, and the Design System.
• Ensure great developer experience and continuously improve performance, reliability, and maintainability across the stack.
• Write meaningful unit and end‑to‑end tests and actively participate in discovery, feedback rounds, and design critiques.

Required profile

• 5+ years of experience building product applications across the stack, with deep frontend expertise.
• Strong communicator and team player who thrives in a fast‑paced, growth‑focused environment.
• Ability to operate in ambiguity, turning loosely defined ideas into working software.
• Experience in a startup or scale‑up, preferably in fintech or regulated domains.

Required skills

• TypeScript
• Svelte & SvelteKit (moving to React & TanStack)
• React
• Node.js, NestJS
• MySQL, Sequelize
• Kubernetes on AWS
• Vitest (unit testing) and Playwright (E2E testing)
• Design Systems (MeltUI, Shadcn)
• Form validation tools such as zod

What we offer

• Competitive salary plus equity
• Customizable benefits package (wellbeing, sport, mobility, food, etc.)
• 28 days of vacation plus company holidays
• Remote work with quarterly trips to Berlin
• Diverse team of 130+ members from 40+ countries