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Full-stack Developer in Barcelona


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Job Description

Who we are:

Marfeel is a publishing platform that revolutionizes the way publishers create, optimize and monetize mobile websites. Over 850 publishers, including USAToday, Euronews, and El Confidencial use Marfeel to serve a billion mobile sessions, every month.

We take a Technology-First approach and have a commitment to developing new tools for digital publishers to reach their audience. Our innovative technology, including PWAs, SEO and engagement tools, monetization and experimentation makes us proud of what we can offer to our clients: faster speeds, greater performance, and worldwide distribution.

Our team now has more than 190 members, made up of over 30 different nationalities. With headquarters in Barcelona and offices in New York and Bogotá, our people and our diversity are the reason behind our world-class product, and we’re still growing.


The role:

We are looking for a Full-stack Developer to join our Product Team.

Marfeel is a product-led company. We use results and data to keep creating better and better solutions to our publishers’ challenges. As part of our product team you’ll be part of:

  • A 190+ strong team with 70% focused on product development
  • An agile environment delivering 4.8 billion ad impressions per month
  • Solutions built using the latest technology
  • Continuous delivery and 200 daily deploys to production
  • Developments that affect 30 million users a day
  • Leading contributions to the open-source community.

If you’re creative and innovative, be part of Marfeel!


This is you:

  • At least 5 years of experience building software that works at web scale
  • Able to create an interface using JavaScript, React, TypeScript, HTML and CSS
  • Capable of developing end-to-end on both server & client side, Java preferable for server-side
  • Demonstrable experience with cross-browser JavaScript and CSS development; strong understanding of HTML5 tags (functions and intent); solid experience with UI components
  • Recent web technologies: 3D CSS transformations, Web Animation APIs, Web Workers, Javascript ES2020
  • A technical problem-solver, with OO, DOM oriented or functional JavaScript
  • Solid understanding of the web technology stack (i.e. headers, cookies, cross-domain restrictions, https, caching, optimization opportunities, hardware acceleration, junk and scroll performance, etc.)
  • Familiar with end-to-end testing, integration testing and testing libraries, like JUnit or Jest
  • Well versed in clean code principles and practices
  • A curious mind and a strong team player, aware of the importance of working with both tech and non-tech departments in order to achieve goals
  • Business-oriented, with a data-driven mindset
  • You love: pair-programming, TDD, collective-code ownership, continuous integration, iterative development, architectural design

We will be impressed by experience in:

  • Online advertising ecosystems
  • AWS services, deploying large applications in the cloud
  • Server-side stacks: NGINX, Tomcat, MongoDB, Node.js, Express
  • UX Design
  • React SSR
  • Instrumentation platforms, like Google Analytics
  • Developing web architectures with Spring framework, REST, Spring IoC, Spring MVC, and Spring Data
  • Parallel code execution

This will be you as part of the Marfeel team:

  • Open-space, light-filled and eco-conscious office with large sunny terrace
  • Unlimited refreshments including coffee, tea & soft drinks
  • Subsidized healthy & tasty lunch delivered to the office & free fresh fruit
  • Ping-pong, video games, table football and other games for down-time
  • Free language and yoga classes at the office
  • Subsidized monthly plan to a huge network of health & wellness centres (Andjoy)
  • Transport, restaurant & kindergarten tickets
  • Subsidized health insurance for you and your partner/family
  • Flexible working hours and early finish on Fridays
  • Loyalty sabbatical and vacation days
  • Access to training platforms, courses & materials
  • Referral bonus for talent brought to us by you



About Marfeel

  • Ad Tech

  • Barcelona

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