Full Stack Developer - JavaScript / Java

Barcelona, Full time

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 170 members, made up of 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.


This is what you will do:

  • Develop clean and reliable code that is simple and scalable, following standards and best practices
  • Contribute to improve the performance of our tech stack
  • Implement new features and functionalities into our product
  • Build interactive components for our platform, using React, styled-components, storybook and other modern frontend tools
  • Collaborate with Developers, UX Designers, Product Managers and other stakeholders to find the best solutions and delight our clients
  • Contribute evolving our server side rendering solution
  • Be a tech reference for peers and help them develop professionally 
  • Take ownership of ongoing initiatives getting actively involved in all development phases, from conception to roll-out
  • Be actively involved in the investigation and resolution of production issues
  • Represent the team in cross team ceremonies, being able to disseminate team’s expertise and help unblocking other teams


This is you:

  • 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 JS and CSS development; strong understanding of HTML5 tags (functions and intent); solid experience with UI components
  • Recent web technologies: Web Workers, Javascript ES2020
  • A technical problem-solver, with OO, DOM oriented or functional JS
  • 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
  • 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, 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:

  • Work in an Agile environment, using cutting-edge tech
  • Access to training platforms, courses & materials
  • Flexible hours, remote work, and early finish on Fridays
  • Subsidized health insurance for you and your partner/family
  • Subsidized monthly plan to a huge network of health & wellness centres (Andjoy)
  • Transport, restaurant & kindergarten tickets
  • Free language and yoga classes
  • 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
  • Loyalty sabbatical and vacation days
  • Referral bonus for talent brought to us by you


This is our interview process: 

We always adapt our interview process to the role, but it usually looks like this:

  • Phone call: we get started by covering the basics, to make sure we fit your search and vice-versa
  • Test stage: we want to give you a preview of the job, as well as see you in action!
  • Interview: we aim to understand you professionally and personally, and answer all your questions too!


This is our tech stack:

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