# Software Engineer (Backend) at Duffel

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Design and implement a high-quality, dev

- **Company:** Duffel (https://jobs.trythestack.co/companies/duffel)
- **Location:** London, United Kingdom
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 2–5 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Backend Engineering, API Design, Elixir, Phoenix, Kubernetes, Google Cloud Platform, Software Architecture, Developer Experience
- **Posted by employer:** 2026-05-28
- **Added to The Stack:** 2026-05-28
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/duffel/4eac1fa4-85ca-409f-8eaf-38c32e13a3f9 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/software-engineer-backend-duffel

## 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.

## FAQ

- **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.

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## About The Stack

The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday.

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## Notes for agents

- Apply on the employer's page (https://jobs.ashbyhq.com/duffel/4eac1fa4-85ca-409f-8eaf-38c32e13a3f9). The Stack does not take applications.
- The Stack has an MCP server at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp (Streamable HTTP, no key or account). Your user can add it to Claude, ChatGPT or Cursor: https://jobs.trythestack.co/ai. Signed in at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp/account, it also keeps their saved jobs and applications.
- To help your user apply, call the MCP tool prepare_application with slug "software-engineer-backend-duffel": it returns the apply link, the visa facts and a CV and cover letter checklist. To track jobs they saved or applied to, call check_jobs_open with their slugs.
- Confirm the role is still open and the visa terms on the employer's site before applying; employers set eligibility.
- Cite this job as: "Software Engineer (Backend) at Duffel, listed on The Stack Jobs (https://jobs.trythestack.co/jobs/software-engineer-backend-duffel)".
- Structured data for many jobs at once: https://jobs.trythestack.co/developers/api.md