Senior Frontend Platform Engineer

October 21, 2026

Hybrid

Senior

Barcelona, Spain

Description

A pet-care marketplace is hiring a Senior Frontend Platform Engineer for its Client Platform team in Barcelona. The team owns shared frontend tooling for web and mobile: the cross-platform Design System, the migration to Next.js SSR, and the React Native-first development cycle. The role combines hands-on contribution with setting technical standards and mentoring engineers across Barcelona teams. Work is hybrid, with two days per week in the Poblenou office.

Responsibilities

Solve complex technical problems at the fundamentals of web and React Native clients
Set technical standards across the organization, then evangelize and educate on them
Build cross-platform code that works across both web and React Native
Help set the technical roadmap and vision for the team without a partner Product Manager
Work with other engineers in Barcelona, mentor them and answer Client Platform questions
Represent Client Platform in broad forums and collect feedback for the roadmap
Help mentor and coach more junior engineers
Expand the cross-platform Design System of reusable components
Migrate the website to a community supported Next.js SSR platform
Build workflows, skills and techniques for AI-based development and migrations

Requirements

7+ years as a professional software developer
Expertise with JavaScript frameworks, especially React, and component-driven design
Experience in React Native development
Expertise in multiple parts of the stack: React, SSR, Django backend, Webpack
Experience building reusable frontend libraries
Experience handling large-scale technology upgrades across a broad codebase
Excitement for defining technical standards that make sense for the organization
Experience coaching more junior developers
Rigor in automated testing, code quality and engineering standard methodologies
Focus on observability and propensity to ship code with effective monitoring and logging
Primarily web development background, with readiness to work on React Native
Readiness to adopt AI/LLM-based development practices in daily work

Conditions

Hybrid position with a minimum of two days per week in the Barcelona office
Office days are Mondays and Thursdays in the Poblenou neighborhood
Candidates must be based in Barcelona or willing to relocate
Full-time employment with flexible work hours and some fixed times
Long-term incentive plan with a company performance-based cash payout
Pension plan and private medical insurance
25 days PTO
Meal allowance and flexible compensation plan for transport and nursery
Gym membership, €450 pet adoption coverage and annual €150 wellness reimbursement
Dog-friendly office with snacks and fresh fruit in the kitchen
First-year salary range in the greater Barcelona area is €62 722 – €76 027

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