Senior Engineer

<h1>Senior Software Engineer</h1><h1></h1><p style="min-height:1.5em"><strong>London | Full-time | Hybrid | Shoreditch/Liverpool Street</strong><br /></p><h2>Create the Future of Travel With Us</h2><p style="min-height:1.5em">Whether it's visiting the people closest to us, starting an exciting adventure, or a career-defining business trip, travel is essential.</p><p style="min-height:1.5em">Yet we've all experienced the aches and pains of getting to our destination.</p><p style="min-height:1.5em">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.</p><p style="min-height:1.5em">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.</p><p style="min-height:1.5em">Our London team is growing, and we're looking for a Senior Engineer to help shape both the product and the team building it.<br /></p><h2>Engineering at Duffel</h2><p style="min-height:1.5em">We're building tools to simplify travel distribution, search, and booking through one seamless API. The technical challenge? Design a world class API, then integrate it with a vast number of travel providers - each with different systems and requirements - whilst delivering a fantastic developer experience.</p><p style="min-height:1.5em">We work with Elixir, Phoenix, Kubernetes, and Google Cloud Platform, but we value strong engineering fundamentals over specific tech experience.</p><p style="min-height:1.5em">As a Senior Engineer, you won't just execute against a spec - you'll help define what gets built and how. You'll take on ambiguous problems, shape technical decisions across teams, and set a bar for quality that others follow.<br /></p><h2>You'll Thrive Here If:</h2><p style="min-height:1.5em">✅ You've designed and shipped APIs at scale, and have a clear point of view on what makes a great one</p><p style="min-height:1.5em">✅ You can take a loosely-defined problem and turn it into a clear technical plan, working independently - weighing technical rigour against business impact along the way</p><p style="min-height:1.5em">✅ You think in systems: you can trace how a decision in one part of the stack ripples into others, and design with those knock-on effects in mind</p><p style="min-height:1.5em">✅ You want to keep writing production code as a senior engineer, not move away from it - this role is hands-on for the long run, not just at the start</p><p style="min-height:1.5em">✅ You've mentored engineers or helped them do their best work, and take real satisfaction in others reaching the bar you hold yourself to</p><p style="min-height:1.5em">✅ You communicate clearly, articulating what you're working on, why, and the reasoning behind your tradeoffs, in a structured way, to a variety of internal and external stakeholders.</p><p style="min-height:1.5em">✅ You thrive collaboratively - you believe in your methods but stay open to feedback and suggestions, and know when to stand by your approach and when to compromise</p><p style="min-height:1.5em"><strong>Bonus:</strong> Experience in travel, flights, hotels, or cars<br /></p><h2>What You'll Get:</h2><p style="min-height:1.5em">💰 Competitive salary + equity (you'll own part of Duffel)</p><p style="min-height:1.5em">🏝️ Work from anywhere policy</p><p style="min-height:1.5em">🏥 Private Healthcare</p><p style="min-height:1.5em">🛩️ Duffel travel allowance (use what we build)</p><p style="min-height:1.5em">🍼 Matched Family leave</p><p style="min-height:1.5em">🧘‍♂️ Sabbatical programme (3 months full pay)</p><p style="min-height:1.5em">🪩 Office in Shoreditch + regular team socials<br /></p><h2>Why Now Matters</h2><p style="min-height:1.5em">You'll work on the core API powering millions of travel bookings, with real influence over its direction. Early-stage role = outsized impact on how we build and scale, and a seat at the table for the technical decisions that will define the next phase.</p><p>Find more <a href="https://www.arbeitnow.co.uk/english-speaking-jobs">English Speaking Jobs in United Kingdom</a> on Arbeitnow</a>