Software Engineer, Backend

Duffel· London, GB

Posted October 31, 2026

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Experience
6+ years
Pay
£80,000 – £90,000 per year
Education
Not specified
Location
London, GB
Work mode
On-site
Job type
Full-time

About this role

Duffel provides a single API for searching and booking flights across hundreds of airlines. The backend engineer designs and builds that API and its developer experience, mostly in Elixir.

What you will do

  • Design and build a well-crafted travel API
  • Integrate with airline systems
  • Deliver a strong developer experience
  • Help define engineering standards and processes

What the employer expects

  • Passion for API design and developer experience
  • Interest in Elixir (prior experience not required)
  • High bar for code quality
  • Ability to weigh technical tradeoffs against business impact
  • Strong communication skills

Benefits

  • Company share ownership for every employee

Skills

  • Elixir
  • Phoenix
  • Kubernetes
  • Google Cloud Platform
  • API design

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