Senior Full-Stack Engineer | Frontend-leaning | Platform Team | Remote Spain

Bunch; United States; Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Equity stake

Flexible benefits

Remote work

Job summary

Bunch is seeking a senior full-stack engineer for a frontend-leaning platform role. You’ll build foundational product experiences while enhancing backend services, shared tooling, testing, and a design system.

You will own technical direction, improve performance and quality on data-heavy financial workflows, and mentor peers across product, design, QA, and engineering teams. This remote role is based in Spain with quarterly travel to Berlin.

Qualifications

• Five or more years of experience building product applications across the stack, with strong frontend expertise.
• Fluency in TypeScript and experience with modern frontend frameworks; comfortable contributing to Node.js backend services.
• Experience with design systems, including ownership or maintenance at senior level.
• Ability to work through ambiguity and deliver shipped software in startup/scaleup environments.
• Experience with unit and end-to-end testing and accessible UI/UX.

Responsibilities

• Deliver robust, maintainable full-stack features with emphasis on frontend quality and UX.
• Shape frontend architecture and contribute to Node.js services and platform tooling.
• Collaborate with PMs, designers, QA, and engineers through discovery and delivery cycles.
• Improve performance, reliability, maintainability, and test coverage across the stack.
• Write meaningful tests using Vitest, Playwright, or equivalent tools.
• Influence platform-wide decisions, guide architecture, and mentor engineers.

Skills

Five+ years experience across the full

TypeScript fluency

Frontend frameworks

Node.js backend

Design systems

Testing (unit/e2e)

Communication & collaboration

Tools

Vitest

Playwright

Zod

Node.js

Job description

Role overview

Senior full-stack engineer joining a platform team in a frontend-leaning capacity. You will build foundational product experiences while also contributing to backend services, shared tooling, testing, and a custom design system. The position offers broad ownership over technical direction and product quality, with work that supports sophisticated financial workflows and data-heavy user experiences.

Responsibilities

• Deliver robust, maintainable, and well-tested full-stack features, with particular attention to frontend quality and user experience.
• Shape frontend architecture and contribute to Node.js services, platform tooling, infrastructure-facing concerns, and the internal design system.
• Collaborate with product managers, designers, QA specialists, and other engineers during discovery, design critique, feedback, and delivery.
• Improve performance, reliability, maintainability, developer experience, and test coverage across the stack.
• Write meaningful unit and end-to-end tests using Vitest, Playwright, or equivalent tools.
• Influence platform-wide decisions, resolve complex UX cases, guide architecture and performance work, and mentor fellow engineers.

Requirements

• Five or more years of experience building product applications across the stack, with substantial frontend expertise.
• Fluency in TypeScript, experience with modern frontend frameworks, and confidence contributing to Node.js backend services.
• Experience with design systems, including ownership or maintenance of custom systems at senior level.
• Familiarity with unit and end-to-end testing, accessible UI/UX, and building elegant, practical interfaces.
• Ability to work through ambiguity, ask productive questions, and convert early concepts into shipped software.
• Experience in a startup or scaleup setting, together with strong communication and collaborative problem-solving skills.

Nice to have

• Background in fintech or another highly regulated environment.
• Experience with Zod or similar validation libraries.
• Experience creating data visualizations, including tables and charts.

Benefits and work setup

• Remote role based in Spain, with an average quarterly trip to Berlin.
• Salary plus equity and a flexible benefits package that can support wellbeing, sport, mobility, food, and related needs.
• 28 vacation days, two company days, and local public holidays.
• Quality technical equipment and collaboration with a diverse international engineering organization.