Senior Java Back-end Developer in Barcelona


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Job Description

We are looking for an experienced Back-End Developer (Java or Kotlin) to join ZeptoLab’s Server Side team!

As a Senir Back-end Developer at Zeptolab, you'll be embedded in a game team of one of our most successful titles C.A.T.S. and will be actively contributing to game design and direction, as well as building scalable backend components. You'll be responsible for making sure that our hundreds of thousands of daily players get the best, most uninterrupted experience possible.

If you have experience in developing live systems, and you understand what it means to support a system with large user volumes, in addition to being interested and excited about working in these areas - this might be a great opportunity for you!

This role is remote or Barcelona office. We offer relocation support.


  • Design, implementation, deployment and maintenance of highly-scalable and available game backend components;
  • Contribute to best-practices on reliability and availability;
  • Work as part of a team improving development process and communication and contributing to game design discussions.


  • Excellent Java programming skills – a minimum of 5 years experience with server-side Java, concurrency handling, and distributed systems;
  • Good experience with Linux shell and scripting languages;
  • Database design and implementation skills, and good SQL knowledge;
  • Collaborative mindset and good communication skills in English;
  • Ability to think clearly under pressure. We aim for minimal downtime in our games, and you are expected to be able to respond to and troubleshoot a wide range of issues in a production environment;
  • Strong self-organization skills. Being passionate and committed to tasks, and an autonomous person with high levels of initiative and energy.


  • Enthusiasm towards games in general;
  • Familiarity with Kotlin or other JVM-based languages (Scala, Groovy);
  • Knowledge of network protocols and non-blocking IO;
  • Experience with NoSQL databases, Cassandra and Redis, in particular, would be a plus;
  • Understanding the challenges and caveats of large-scale distributed systems;
  • Familiarity with concurrent, event-driven systems.

Why join us

  • We do something magical and unique – we create great games – and we do it well;
  • We operate in a challenging and rapidly growing mobile gaming industry;
  • ZeptoTeam - is a cohesive team of enthusiastic professionals - so your input will be heard, and your role in the project will be weighty;
  • Our office is cozy and beautiful, you'll have a comfortable working place;
  • Diversity and inclusion are important to us. ZeptoLab is committed to creating a diverse environment and is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, colour, religion, age, gender, gender identity or expression, sexual orientation, or disability;
  • And at last – we'll offer you an attractive compensation package (from wages to social intangible elements. Package includes medical insurance, meals, transportation, fitness and a lot of additional services).

About Zeptolab

  • Games

  • Barcelona, Spain

  • 50-200

  • 2010

ZeptoLab is a global gaming international company dedicated to the science of fun. It all started back in 2010 with just two people and one monster – the cheerful green Om Nom, whose biggest passion is candies.

Since then, Cut the Rope games have been downloaded more than 1,3 billion times. Cut the Rope franchise aside, ZeptoLab released C.A.T.S. Crash Arena Turbo Stars and King of Thieves, massive multiplayer mobile titles with more than 170 million combined downloads so far. The company’s portfolio also includes Pudding Monsters and My Om Nom.

And there’s more to come! ZeptoLab is an ambitious and growing global entertainment brand: we’re constantly working on new games and aim to expand them beyond smartphone screens. With the help of our partners, we develop toys, clothes and other cool stuff. “Om Nom Stories” cartoon series has exceeded 3 billion views on YouTube and in-game player, and the seasons keep coming! Our mission is to bring fun to every corner of the world, and we’re just getting started.

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