Senior Frontend Developer (React)
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Madrid (hybrid)
Full-time
About FERO
FERO is reinventing checkout for eCommerce.
We build high-performance, adaptive checkout experiences that help merchants increase conversion and revenue.
Backed by top-tier VCs, we're building from Madrid with a strong focus on performance, UX, and real impact.
Why join FERO?
Work on a product that directly impacts revenue
Own critical parts of the user experience
Modern stack + real performance challenges
Direct collaboration with product and engineering
Competitive salary + equity
Ambitious, international team
About the role
We're looking for a Senior Frontend Developer to lead the development of our next-generation checkout experience.
You'll design and build high-performance React interfaces, working closely with backend teams to deliver seamless, scalable checkout flows.
This is a product-focused role where UX, speed, and conversion matter.
What you'll do
Lead frontend development of checkout experiences
Build modern, responsive interfaces using React, JavaScript, HTML, and CSS
Integrate with backend APIs (REST, GraphQL), payment systems, and eCommerce platforms
Collaborate with backend engineers, product, and design
Write clean, scalable, and maintainable code
Optimize performance, accessibility, and UX
Use data and best practices to improve conversion
Core requirements
5+ years of frontend development experience
Strong expertise in React and modern JavaScript
Experience integrating with REST and/or GraphQL APIs
Experience building high-performance web applications
Strong understanding of UX, performance, and accessibility
Nice to have
Experience with eCommerce platforms (Magento, WooCommerce)
Exposure to payments or checkout systems
Familiarity with backend systems (Node.Js, PHP)
Experience with experimentation / A/B testing
Who you are
Product-minded — you care about user experience and impact
Strong ownership — you take features from idea to production
Detail-oriented and performance-focused
Curious and always learning
Collaborative and proactive
What makes this role different
You're not just building UI —
you're working on the most critical moment in eCommerce: checkout.
Every improvement you ship directly impacts conversion and revenue.
What we offer
Competitive salary + equity
Private health insurance (partially covered)
Hybrid work (3 days office / 2 remote)
Real growth opportunities
Collaborative, high-performance environment
Hiring process
Application review
Intro call (15–20 min)
Technical interview (deep dive + practical discussion)
Final interview
Offer
Ready to build what really matters? xqysrnh
If you want to work on high-impact product challenges and push performance and UX to the next level — we'd love to meet you.