Descripción





We’re looking for a Frontend Engineer with strong React skills to help us build, maintain, and improve responsive, user-friendly interfaces. You’ll join a collaborative, product-led team where clean code, thoughtful architecture, and user experience are at the heart of everything we do.

This is a hybrid role requiring 3 days per week in our Barcelona office.

Your First 90 Days

• 30 days – Get familiar with our frontend stack, tools, and design systems. Understand team workflows, product goals, and development practices.
• 60 days – Start contributing to key product features. Write clean, modular, and testable code using React (hooks, functional components, state management). Collaborate closely with designers and backend engineers.
• 90 days – Take ownership of feature delivery from planning to release. Participate in code reviews, technical discussions, and help shape our frontend architecture and component libraries.
  
  
  
  
  
  

What You’ll Do

• Build, maintain, and improve responsive UI components using React and JavaScript.
• Write clean, modular, and testable code following modern best practices (hooks, functional components, state management).
• Contribute to frontend architecture and component libraries to ensure consistency and reusability.
• Collaborate with designers to translate Figma/mockups into polished implementations.
• Work with backend engineers to define and consume APIs.
• Optimize performance, accessibility, and cross-browser compatibility.
• Participate in code reviews, sprint planning, and technical discussions.
• Use last AI tools and practices like CursorTech Stack
  
  
  
  
  
  

Meet the Team

You’ll report to an Engineering Team Lead and work alongside designers, backend engineers, and product managers. Our team is cross-functional, agile, and highly collaborative, with a strong focus on user-centred design and maintainable code.

How Success Will Be Measured

• Delivery of clean, scalable, and reusable UI components.
• Active contributions to code quality, performance, and maintainability.
• Effective collaboration with cross-functional peers.
• Adoption of best practices in testing, accessibility, and responsive design.
  
  
  
  
  
  

Skills You’ll Gain

• Advanced experience with React, and modern UI architecture.
• Exposure to product-led development and scalable design systems.
• Enhanced skills in testing, accessibility, and performance optimisation.
• Experience working in a fast-paced, agile, and global environment.
  
  
  
  
  
  

Responsabilidades principales Snapshot of Your Day-to-Day

You’ll build and refine React components, translate Figma designs into code, and collaborate with designers and backend engineers to deliver end-to-end features. You’ll also contribute to component libraries, participate in reviews, and help shape our frontend architecture.

Qualifications

• Strong proficiency in JavaScript (ES6+) and modern frontend development.
• Solid experience with React (hooks, functional components, context).
• Familiarity with design systems and responsive design principles.
• Experience working with APIs and integrating frontend with backend services.
• English fluency is a plus.
  
  
  
  
  
  

Tech Stack You’ll Work With

• Languages and libraries: JavaScript, React, HTML, CSS, Golang (optional)
• Testing: Jest, React Testing Library, Cypress (optional)
• DevOps: Git, CI/CD pipelines, feature flag systems
  
  
  
  
  
  

At Sage, we offer you an environment where you can grow professionally without compromising your personal well-being. Our benefits package is designed to provide stability, flexibility, and balance:

• Flexible benefits: exchange part of your salary and make tax savings on health insurance, meal and transport vouchers, childcare, and training.
• Well-being: Free access to the Calm app (for up to 5 users), 24/7 counselling, and emotional support from our Healthy Mind Coaches. We also offer self-care and parenting resources through the Cleo app.
• Flexible working: flexibility of working one hour in, one hour out, shortened workdays on Fridays and during the summer, and the opportunity to work from over 40 countries for up to 10 weeks per year through our Work Away program.
• Annual leave: 23 working days of vacation, 5 paid days per year for volunteering, and 5 additional paid days annually for personal or professional development.
• Extended leave: 7 extra days of maternity leave and 5 extra days of paternity leave, on top of the legal allowance, available after one year of service.
• Financial support: Life and disability insurance, salary advances of up to 3.5 times your net monthly pay, a €300 net marriage bonus, and access to Sage's employee stock purchase plan at a discounted rate.
  
  
  
  
  
  

Health and Safety Responsibilities

• Fostering the safety culture, by leading with your own example.
• Following established safety procedures and reporting potential hazards promptly helps maintain a secure and efficient workplace.
• Participating in safety training sessions and adhering to preventive guidelines and procedures, the objective is minimizing risks and protecting yourself and the rest of your colleagues.