Ruby on Rails Engineer SENIOR

Overview Ruby on Rails Software Engineer — Candidates based in Spain, Europe. from 4 years of experience. 4 days remote / 1 day from office.

What’s the project? A leading fintech company, develops Currency Management Automation software that helps businesses automate their foreign exchange processes and unlock growth through smarter currency strategies.

What is your role? We’re looking for a Ruby on Rails Engineer to join the core Ruby team at Kantox—where performance, reliability, and elegant code matter deeply. You’ll work on building and improving our platform, writing well-tested and maintainable code, and collaborating across teams in a diverse, international engineering environment.

Your mission : Build & improve our core services with clean, efficient Ruby code.

Write meaningful tests and help maintain a robust test suite.

Collaborate with other teams and integrate with services like Elixir, Java, Redis, RabbitMQ.

Monitor & maintain the health of our system using metrics and checkers.

What do you need? A Ruby Engineer with strong fundamentals and a desire to grow within a highly collaborative environment.

Here’s what matters most : 4+ years of experience working with Ruby / Ruby on Rails

Degree in Computer Science or equivalent (Master’s is a plus)

Testing mindset : you believe in writing tests and doing it well

Strong grasp of Ruby, object-oriented programming, and meta-programming

Permission to work in the EU is a bonus

Bonus skills : Elixir or Java service integration

Working knowledge of CI / CD, metrics, or observability tools

Experience with Rails version upgrades

What else do you bring? Passion for Code : You breathe code and write it clean.

Team Spirit : You collaborate, challenge, and support—without ego.

Drive for Improvement : You practice continuous learning and evolve your craft.

Autonomy : You take ownership, manage complexity, and stay self-driven.

If you love Ruby and want to build meaningful fintech tools with a smart, international team—this is for you.

Seniorities Mid-Senior level

Employment type Full-time

Industries IT Services and IT Consulting

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