Senior Product Engineer (Backend-Leaning Fullstack) in London

Join us at a pivotal moment to help maintain and evolve our B2C products used by millions, while playing a key role in building our new B2B offering from the ground up. You'll build the TypeScript/NestJS services powering our mobile app and ship full-stack features (backend through frontend) on our web products.

Who You Are

• You're a Product Engineer first, an engineer second. Code is a tool, the goal is user value and business impact.
• You're backend-heavy and full-stack capable. Your home base is backend (TypeScript/NestJS), and you ship full-stack on the web (React/Next.js/similar) when the work calls for it. Angular & Vue experience is fine!
• You build for mobile without building the mobile app. You design APIs and services that serve mobile clients beautifully, accounting for offline, network, battery, and app-release realities and are able to partner closely with mobile engineers.
• You own features end-to-end. From API design and data modelling to web frontend implementation, deployment, and post-launch iteration.
• You're a proactive collaborator. You ask the right questions, propose solutions, and work effectively with teammates whose depth complements yours, including mobile, design, and product.
• You thrive in fast-paced, early-stage environments where speed, user feedback, and product-market fit drive decisions.

What You Bring

• You have strong backend depth in TypeScript and NestJS (or comparable Node.js frameworks).
• You bring solid web frontend skills with React, Next.js, or similar enough to ship polished, production-quality interfaces independently.
• You have a working knowledge of cloud infrastructure; ideally GCP (Cloud Run, Cloud Functions, Firestore), CI/CD pipelines, and event-driven patterns (BullMQ/Redis or similar). You can ship and operate your own services.
• You have awareness of mobile constraints. You know what makes an API painful or delightful to consume from a mobile client, even if you don't write the mobile code yourself.
• You value pragmatism over purism. You make calibrated calls on architecture, scale, and tech debt based on what the product actually needs.

How You Work

• You push back on the why, not just the how.
• You ask "why are we building this?" before "how do we build this?"
• You propose simpler alternatives when a 3-day version captures 90% of a 3-week feature's value.
• You're comfortable telling PMs and designers when something isn't worth building.
• You treat technical debt as a tool.
• You ship throwaway prototypes to validate hypotheses with real users.
• You delete what flops and re-architect what succeeds.
• You know when "the right way" is a luxury vs. a necessity, and can tell the difference.
• "Done" to you means users are using it. A merged PR isn't done. A feature is done when it's live, adopted, and the metrics prove it was worth building.
• You actively monitor analytics post-launch.
• You're a strategic partner. You sit with PMs and designers to shape what we build and what we don't.
• You're as comfortable in a product strategy conversation as you are in a code review.
• You contribute insights from user data, technical constraints, and implementation realities to inform product decisions.

Must be based and have the right to work in the United Kingdom.