Senior Full Stack Engineer (Backend-leaning) - High-Growth eCommerce PlatformLondon / Hybrid (1 day per week) ·c£80,000 + Share Options · VC-backed Series A Startup🚫 This company is unable to offer visa sponsorship at this timeShape the Architecture of a High-Growth eCommerce PlatformWe’re working with a VC-backed, Series A startup in the luxury eCommerce space that is scaling fast and working with some of the most recognisable fashion brands globally.They’re looking for a Senior Full Stack Engineer (backend-leaning) to take ownership of architecture, data flows, and complex integrations powering a platform used by millions.This isn’t about tweaking themes, it’s about designing and scaling systems at the core of a rapidly growing business.The OpportunityDesign and scale backend systems powering payments, returns, personalisation, and more.Lead API-first development, data modelling, and performance optimisation.Build reliable systems in TypeScript, working across the stack with React on the frontend.Own deep integrations with Shopify APIs and third-party services (not just theme edits).Collaborate closely with product and design in a lean, high-impact team.Embrace automation and AI tooling to accelerate delivery and maintain quality.Tech StackLanguages: TypeScript (core), Python/Ruby (data flows)Frontend: React (preferred), Node.js welcomeInfrastructure: AWSDatabases: RDBMS (essential), Neo4j (nice-to-have)Integrations: Shopify APIs, payment gateways, fraud toolsYou’ll Thrive Here If You...Have strong backend engineering fundamentals (schema design, query optimisation, scalable architectures).Have hands-on experience scaling systems in startups or scale-ups.Enjoy owning architecture end-to-end in small, fast-moving teams.Are excited by working close to the product and shipping meaningful features quickly.Bonus: experience with eCommerce APIs, Shopify, payment gateways, or growth tooling.Why This RoleReal architectural ownership in a lean engineering team.Build systems that reach millions of users.Fast decision-making, direct impact, and modern engineering culture.c£80,000 + share options, hybrid London, 1 day/week in office.Series A stage — ideal for engineers who want to shape tech foundations pre-scale.Interview Process30-min culture & tech fit conversation60–90 min technical scenario interview (no whiteboarding)OfferIdeal for senior full stack or backend engineers with TypeScript/React/AWS experience who want to shape architecture at a growing, product-led company.