Senior Backend Developer (Java/Kotlin)

We are looking for an experienced Backend Developer to join ZeptoLab’s Server Side team!

As a Backend Developer at Zeptolab, you’lll be responsible for server-side development for our games, 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 based in the Barcelona office.


  • Design, implementation, deployment and maintenance of highly-scalable and available game backend components (you will use Java 8 and Kotlin);
  • 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 3 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 Russian and 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).
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