Software Engineer; Backend

Software Engineer

London | Full-time | Hybrid | Shoreditch/Liverpool Street

Create the Future of Travel With Us

Whether it's visiting the people closest to us, starting an exciting adventure, or a career-defining business trip, travel is essential. Yet we've all experienced the aches and pains of getting to our destination.

More than 4 billion airline passengers rely on technology that hasn't kept up with modern expectations. That's why we're rebuilding the infrastructure that underpins the travel industry - simplifying systems and building tools that will make the future of travel effortless.

We were part of Y Combinator S18's cohort and we're backed by Benchmark, Blossom, Index Ventures, and Kima Ventures - a fantastic set of investors that has helped build some of the world's largest companies.

Our London team is growing, and we're looking for talented people to join us on our journey.

We're building tools to simplify travel distribution, search, and booking through one seamless API. The technical challenge? Design a beautiful API, then integrate it with hundreds of travel providers - each with different systems and requirements - whilst delivering a fantastic developer experience.

We work with Elixir, Phoenix, Kubernetes, and Google Cloud Platform, but we value strong engineering fundamentals over specific tech experience.

Work on the core API powering millions of travel bookings, designing beautiful APIs and creating great developer experiences. Define engineering standards and processes, and build integration solutions with hundreds of travel providers.

• Passionate about designing beautiful APIs and creating great developer experiences
• High bar for code quality and API design
• Opinionated about good engineering standards and processes, as we define ours at Duffel
• Think big picture – making trade‑offs between technical work and business impact
• Communicate clearly, articulating what you’re working on and why in a structured way
• Collaborate well – believe in your methods but stay open to feedback and suggestions

Experience in travel, flights, hotels, or cars.

• Competitive salary + equity (you’ll own part of Duffel)
• Work from anywhere policy
• Duffel travel allowance (use what we build)
• Matched parental leave
• Sabbatical programme (3 months full pay)
• Visa sponsorship available
• Office in Shoreditch + regular team socials

You’ll work on the core API powering millions of travel bookings. Early‑stage role = outsized impact on how we build and scale.