📍 Madrid (Hybrid)

🕒 Full-time

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, data, and real impact.

We’re looking for a Full Stack Developer to join our Engineering team.

You’ll help build and improve our next-generation checkout experience, working across our WooCommerce checkout plugin and Magento checkout module. You’ll develop modern React interfaces, contribute to PHP backend services, and help deliver seamless, high-converting checkout flows.

We’re looking for someone with relevant professional experience who’s excited to grow as a Full Stack Developer. Whether your background is stronger in frontend or backend, you’re curious, adaptable, and eager to keep learning across the stack.

• Build end-to-end features across frontend and backend.
• Develop modern, responsive user interfaces using React, JavaScript, HTML, and CSS.
• Build and maintain backend functionality using modern PHP.
• Work on our WooCommerce checkout plugin and Magento checkout module.
• Integrate frontend and backend through REST and GraphQL APIs.
• Collaborate closely with engineers, product managers, and designers.
• Write clean, maintainable, and testable code.
• Continuously learn new tools, technologies, and best practices.
  

• Relevant professional experience building web applications.
• Experience designing scalable systems.
• Experience working across the stack, with a stronger background in either frontend or backend.
• Strong problem-solving skills.
• Ability to work collaboratively within an engineering team.
  

• Experience with modern PHP.
• Experience with React, JavaScript, and TypeScript.
• Experience working with eCommerce platforms.
• Experience with REST or GraphQL APIs.
• Familiarity with checkout or payment flows.
  

• You’ve ideally worked in smaller teams.
• You’re excited to learn new frameworks, tools, and technologies.
• You have stronger experience in either frontend or backend and are motivated to continue growing across the full stack.
• You like being close to the impact of your work. At our size, what you build reaches production and customers fast.
• You’re happy wearing more than one hat when needed. In a team our size, ownership doesn’t stop at a narrow job description.
• You’re comfortable when priorities shift as we learn. We’d rather ship, iterate, and improve than wait for perfection.
  

• Permanent contract.
• Private health insurance (partially covered).
• Hybrid work (3 days office / 2 remote).
• Office in a central location in Madrid.
• Real growth opportunities.
• High-impact, collaborative environment.
  

• Screening call
• Technical interview with the Hiring Manager
• Final conversation