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Senior Software Engineer (Ruby on Rails/Elixir) in Barcelona


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Job Description

We’re looking for a Ruby on Rails and/or Elixir Engineer to join our Kantox software engineering team in Barcelona! Our platform core is primarily based on Ruby on Rails but we also make good use of Elixir and Elixir/Phoenix as well. You will work with a self-motivated multi-disciplinary multi-cultural team that view Kantox software development as an extreme team sport.

The Kantox Engineering Manifesto

Kantox is a team sport. Our engineering culture is devoid of egos yet we take great pride in our work. We believe in constructively challenging each other pushing our knowledge, code, processes to the absolute limit.

Our processes are based around continual self improvement, continual code integration and deployment.


● Maintain and improve the code base, make sure that all the applications are running correctly

● Develop and test new features, solve issues as they appear, perform due maintenance and upgrades

● Review peer's code and help them improve. Review requirements and make sure they are valid and efficient.

● Participate in the Support shifts, solving requests from the rest of the company in a cordial and timely manner.

● Raise improvement suggestiond, participate in technical discussions, prepare and maintain technical documentation.


  • Senior level engineers with 3+ years of professional experience in either Ruby on Rails or Elixir
  • Team player with strong opinions capable of building consensus for the causes that they are passionate about and equally capable of accepting the direction taken once a decision has been taken
  • Engineers who value automation in testing and understand what it means to develop code with test driven automation in mind
  • Engineers capable of taking a complex feature and breaking it down in to bite size sprints that can be easily tracked both within engineers as well by our product development team
  • Engineers who practice continual improvement
  • Engineers that are self driven capable of moving ahead in the agreed direction with minimal supervision
  • Engineers who understand the balance between getting it done versus long term sustainability
  • Passionate about technology and who love engaging with other engineers to extract the best out of each other
  • Engineers with a University degree in Computer Science (preferably a Masters) or equivalent

Expected Skills & Experience

  • Permission to work within the EU is a must
  • At least 3 complete years working professionally on either: Ruby on Rails or Elixir based projects
  • Testing: you are convinced of its value and you know how to create useful, complete tests
  • Fluent in English.
  • If you are technically fluent in both Ruby on Rails and Elixir then we really would like to talk to you!


  • Competitive salary
  • Sponsored learning budget
  • Free private health insurance
  • Free Spanish, English and French lessons
  • Relocation package if needed
  • Flexible working hours with an intensive Friday schedule
  • 26 days of annual vacations
  • Gym discounts and free sport activities
  • Restaurant Ticket with monthly credit and regular cross-team lunches
  • Fresh fruit and unlimited coffee
  • Beautiful office with incredible 360-degree views of Barcelona


About Kantox

  • Fintech

  • Barcelona, Spain

  • 50-70 employees

  • 2011

Kantox is a foreign exchange service provider, offering small-medium sized enterprises and mid-cap companies a comprehensive solution to their foreign exchange needs, based on transparency, efficiency and value.

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