AI Engineer – Backend

🕒 April 30

🏢🏡 London – Hybrid

⏰ Full Time

🟡 Mid-level

🟠 Senior

🔙 Backend Engineer

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Duffel

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2017

🔌 API

🤝 B2B

☁️ SaaS

💰 $30M Series B - Duffel on 2019-10

API • B2B • SaaS

Duffel is a technology platform that enables businesses to sell and manage travel products through a developer-first API. The company provides tools and accreditation to access global airline content, book and manage flights, offer ancillaries (seats, baggage), and distribute hotel stays, with SDKs, documentation, and prebuilt components for rapid integration. Duffel targets other businesses—startups, challenger banks, spend-management platforms, and enterprises—that want to embed travel booking and revenue streams into their own products.

📋 Description

• Design, ship, and own production-grade AI agents end-to-end — from intent through to taking action against Duffel's APIs — and define the agent development lifecycle the rest of the team will follow. • Build the core platform that powers our agents: the orchestration engine, runtime, and primitives that define how agents reason, take actions, and interact with users — keeping them steerable and verifiable while staying conversational and adaptive. • Make agents trustworthy. Build the retrieval and grounding systems that ensure responses are accurate, and the evaluation frameworks that let us measure and improve agent quality deliberately rather than vibes-first. • Lay the foundations for memory and personalisation: long-term agent memory, reusable customer data primitives, and the optimisation loops that let agents personalise interactions and demonstrably lift business outcomes.

🎯 Requirements

• Significant experience shipping AI agents and LLM systems into production, with strong opinions on the modern toolkit — eval frameworks, agent orchestration, RAG pipelines, prompt engineering — and the tradeoffs between them. • A track record of taking ambiguous problems from zero to one, raising the bar for the engineers around you, and shaping technical direction across teams. • A strong general engineering foundation. We care more about your ability to design good systems than about any specific language or framework — you'll work across our stack as needed (Elixir on the backend, TypeScript on the frontend). • Big picture thinking — you can make tradeoffs on technical work streams against business impact, and know when to ship something rough to learn from versus when to invest. • Fantastic communication skills. You're able to articulate what you're working on and why to the team in a clear and structured way. • You thrive in a collaborative environment. You believe in your own methods but keep an open mind, taking suggestions and feedback onboard as well. • Bonus if you have experience in travel, flights, hotels or cars.

🏖️ Benefits

• Duffel Travel Allowance: We subsidise your wanderlust. • Work From Anywhere (60 days): Your office, your rules. • Sabbaticals: Long-term loyalty, long-term breaks. • Flexible Bank Holidays: Swap holidays to suit your schedule. • Study Days: Get paid to learn. • Volunteering Day: One day a year to save the world. • Electric Car & Cycle Schemes: Eco-friendly rides, tax-free prices. • Family Leave (maternity, paternity and adoption): Big support for life’s biggest moments, 26 weeks fully paid. • Pensions & Loans: Future-proofing and interest-free commuting. • Eye Tests: Keeping your vision (and your style) sharp.