Software Engineer (Backend) at Duffel
May no longer be active — verify on the employer site
At a glance
- Company
- Duffel
- Location
- London, United Kingdom
- Work arrangement
- On-site
- Employment type
- Full-time
- Experience
- 2–5 years
- Working hours
- 40 hours
- Visa sponsorship
- Offered, according to the listing
- Posted
✨ The Stack take on this Duffel job
- 🏢 This is Duffel's only job here right now
- 🛂 Skilled Worker visa. Standard minimum salary: £41,700 a year guide
- 💡 No salary shown. Ask Duffel if it is above the minimum.
Updated 2026-11-05, from our data and official sources.
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About the role
Responsibilities:
- Design and implement a high-quality, developer-friendly public API for travel distribution, search, and booking.
- Integrate and maintain connectors to many travel providers, handling varying protocols and edge cases.
- Build scalable backend services using Elixir/Phoenix, deploy on Kubernetes and Google Cloud Platform.
- Maintain strong test coverage, code quality, and observability for production systems.
- Collaborate with product, design, and other engineers to drive product decisions and technical trade-offs.
Requirements:
- Strong engineering fundamentals with experience building backend services and APIs.
- Experience or willingness to work with Elixir and Phoenix; familiarity with Kubernetes and GCP preferred.
- Solid understanding of API design, reliability, and developer experience best practices.
- Good communication skills, ability to explain trade-offs and work collaboratively in a team.
- Bonus: prior experience in travel (airlines, hotels, cars) or integrating third-party providers.
Responsibilities
Design and build a seamless API to simplify travel distribution, search, and booking. Integrate the API with hundreds of travel providers while maintaining high engineering standards.
Requirements
Candidates should have strong engineering fundamentals and a passion for high-quality API design and developer experience. Experience in the travel, flights, hotels, or cars industry is a bonus.
Key skills
- Backend Engineering — in 127 other listings on The Stack
- API Design — in 192 other listings on The Stack
- Elixir — in 8 other listings on The Stack
- Phoenix — in 1 other listing on The Stack
- Kubernetes — in 585 other listings on The Stack
- Google Cloud Platform — in 53 other listings on The Stack
- Software Architecture — in 102 other listings on The Stack
- Developer Experience — in 16 other listings on The Stack
Relocation terms mentioned in this listing
- flights
Quoted from the listing's text; confirm the details with Duffel.
On The Stack (as of 2026-11-05)
Frequently asked questions about Duffel
Is this Software Engineer (Backend) role still open?
It was posted on 2026-05-28. Listings more than 30 days old may no longer be active, so check Duffel's site before applying.
Does Duffel offer visa sponsorship?
This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Duffel's site.
Where is this role located?
The listing gives the location as London, United Kingdom. It is marked on-site.
What skills does this role ask for?
The listing names: Backend Engineering, API Design, Elixir, Phoenix, Kubernetes, Google Cloud Platform, Software Architecture, Developer Experience.