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Senior Software Engineer - Ruby on Rails / Elixir in Barcelona


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Job Description

Kantox is a leading fintech company building solutions that help companies to use currencies to boost competitiveness. Today, we’re also one of the fastest-growing fintechs in the world, with over 4,700 clients in 72 countries.

With company headquarters in London and stunning Mediterranean-facing offices in Barcelona, our team is made up of more than 120 people from 33 different nationalities.

We launched our award-winning Dynamic Hedging solution in 2016. Since then, we have received several awards for our innovative technology with Treasury Management International also recognising our solutions as best-in-class, awarding us the Best Risk Management Solution and Best Solution Innovation – FX Risk.

We’re always on the lookout for new Kantoxers that are committed to helping us deliver disruptive solutions that benefit the wider financial industry.

Could that be you?

The Position

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.


  • 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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