Senior Software Engineer

About Letly Letly is the AI-Native operating company built for the home. We believe the home should be autonomously run and we're building the software that will run all rental properties end-to-end. The backend at Letly is technically difficult on purpose as the operational realities of handling property and money are messy. But the foundations are already there: 10+ backend and AI services, a monorepo on the frontend, GitOps and Kubernetes on the infra side. You'd be building on solid ground rather than firefighting a fragile prototype — with a lot still to build. We've raised a $4m pre-seed and are a small, high-agency, engineering-oriented team, growing revenue at >100% month-over-month. We're hiring to facilitate this aggressive growth. Our stack - Backend — a microservice architecture in NestJS and TypeScript, with Python and FastAPI for the AI agent services. - Data — MongoDB Atlas and Redis. - Event-driven — services coordinate over Pub/Sub rather than calling each other directly. - Infra — Kubernetes on GCP (GKE), deployed via ArgoCD. - Frontend — Angular in an Nx monorepo. How we build Small, well-factored services with clear boundaries. Tests are written alongside the code, not after it — they're what lets us move quickly without breaking things that handle money. Trunk-based CI/CD: you ship to production and own it, with observability and clean rollbacks. Lean frameworks, readable code. We work on a wide spectrum of technical challenges from money movement to operational logistics (scheduling, bookings, access) mediated over event-driven systems, to building around AI agents in production that are capable of executing autonomously under the hood. What we're looking for - You've built and operated production backend systems that real users depended on. We care about the scope you've owned and how you owned it. - First Class or high 2:1 (or international equivalent) in Computer Science or a relevant technical field. - Fluency in at least one backend language and framework. You don't need to arrive fluent in our stack: we hire engineers who've built production systems with any robust framework — NestJS/TypeScript, Java/Spring Boot, Go, Kotlin, C#/.NET or Ruby on Rails — and can ramp into TypeScript fast. - System design: where a service boundary belongs, what a design trades away, how services coordinate — events, queues, retries that are safe to repeat — and how it holds up once it's live. - Fundamentals: concurrency, HTTP and API design, auth, data modelling and transactions (document or relational), changing a live schema safely, and what happens when a call fails. - Tests: you treat tests as part of shipping, you work comfortably in a shared trunk, and you can quickly understand a large codebase you didn't write. - You use AI heavily and still know exactly what you shipped. Generated code has the same quality bar as what you wrote by hand: you can explain every line, you've thought about the constraints it has to bear, and you don't merge anything you couldn't have written yourself. How you work - Hyper-focus on detail. These systems move money and manage assets; we have low tolerance for "mostly right". - First-principles reasoning. You take a hard problem apart rather than reaching for the nearest familiar pattern. - Communication clarity. You can explain a complex trade-off to another engineer, and to someone who doesn't write software — because here you'll have to do both. - Ownership mentality. You own the outcome, not the ticket: start to production, without being chased. - Collaborative. Teams change the world, not individuals. You make the next engineer better and faster. - Adaptability. You do well in a fast-moving environment where requirements shift under you. - Learning velocity. You pick up new paradigms quickly and don't need long to get productive in unfamiliar territory. - Quality-obsessed. Not just the code — the tests, the docs, the handover, the thing you leave behind. Our process We aim to complete end-to-end in under a week. - Screening — 30 minutes with the CEO - Skills — 45 minutes with the CEO & CTO - Problem solving — 60 minutes with the CTO - Slope — 45 minutes with the CEO - Offer — references and a decision in days Benefits On top of base salary, equity and annual bonus, you're also entitled to: - Private health insurance - Paid gym membership - Three meals a day, in office - Ubers home on late nights Compensation: £70K – £140K • Multiple Ranges - Mid • £70K – £100K - Senior • £90K – £140K Find more English Speaking Jobs in United Kingdom on Arbeitnow