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Senior Front-end Developer - React

Publishing, media, mobile, advertisement, technology, Barcelona, start-up: all-in-one!

Job details

  • Full-time
  • map markerBarcelona, ES
  • globeRelocation paid
  • cardRequires Work Permit
    Requires that you're a citizen or have a valid work permit / visa sponsorship to work in the country in which this position is based.
  • routeSenior
  • routeEnglish
    Preferred spoken language

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We are Marfeel, one of the hottest European start-up companies, and we help publishers of all sizes to create, optimize and monetize their mobile websites. We have been named 16th fastest-growing European company of 2018, by The Financial Times, but we still think we have a long way to go to where we want to be.

We are looking for a talented Senior Front-end Engineer with React to join our Core product team and be part of a multicultural and talented Engineering team of over 70 developers. Our headquarters are based in sunny Barcelona and our office has a huge terrace to enjoy!

You will be part of a team who owns the performance and the architecture of our front-end ecosystem that supports over 15 million visits a day. Currently, we are in the process of redefining our architecture to React.

As a Senior Front-end Developer at Marfeel you will:

  • Help us define and implement our new front-end architecture
  • Have a say in what libraries, tools and technologies we use for front-end development
  • Join a fun and dynamic Core product team that follows Agile practices
  • Have opportunity and support to grow and develop your career further
  • Be able to help us shape our rapidly growing Engineering department
  • Be part of a multicultural and talented company, consisting of 28 nationalities

If this sounds interesting and you are up for the challenge, sit down and let us introduce Marfeel to you:

Main requirements

  • You have proven experience in delivering end-to-end features in React and other modern JavaScript front-end technologies for mobile applications
  • You have worked with Styled Components and style sheet languages, such as SASS
  • You know different ways of managing application state in the front-end
  • You have a solid understanding of the web technology stack (i.e. headers, cookies, cross-domain restrictions, HTTPS, caching, optimization opportunities, hardware acceleration, junk and scroll performance, server-side rendering etc.)
  • You are familiar with modern development and build tools such as Git, npm, Babel, and webpack
  • You have experience working in cross-functional collaborative teams, following Agile best practices
  • You are comfortable contributing to and leading technical and/or architectural discussions
  • You take ownership of your and your team's code quality. Writing tests is in your second nature, and you have a broad understanding of UI testing techniques
  • You continually strive to share your knowledge around best code practices
  • You have high emotional intelligence and finding it easy to empathise with others
  • You don’t take yourself too seriously and enjoy a few jokes now and then

Nice to have

  • You have experience with developing Progressive web applications, service workers, push notifications
  • You know how to analyse and optimise the performance of a front-end application
  • You have experience with various AWS services and understand the challenges of deploying large applications in the cloud
  • You are an active contributor to a front-end community
  • You have worked with Jenkins and familiar with CI and CD release cycles
  • You have experience with back-end languages and frameworks such as Node.js, Java, Python or any others
  • Experience with Google Analytics and ADServing
  • You are familiar with #perfMatters
  • You have experience with Vue.js and Linters


  • Talented, international and multicultural team (more than 27 nationalities and more than 8 languages). You will not get lost in translation
  • Flexible working hours
  • Free coffee, tea, juices and soft drinks
  • Beer tap in the kitchen
  • Sunny office terrace
  • Ping-pong, Mario Kart and foosball tournaments
  • Nerf guns
  • Free language and yoga classes
  • Team building events
  • Training, books and all you need to feel the empowerment
  • Beach: 30 minutes walking
  • Transport, restaurant and kindergarten tickets
  • And, Referral Bonus if you bring other talented people like you

Apply now

Sign up to apply

Or sign up to refer and earn a reward of €300