Senior Fullstack Engineer (Rails, React)

About 8returnsReturns aren't just inconvenient, they're quietly eroding the profitability and sustainability of retail brands. At 8returns, we turn the costly chaos of e-commerce returns into streamlined, data-driven profit. We've been trusted by some of the fastest-growing European DTC brands like OACE, PEGADOR, and GOT BAG, and are now ready to scale our proven solution to larger retail brands—with iconic brands such as Fielmann, Tommy Hilfiger, and FILA already leveraging our platform. This is where you step in. About the RoleAs a Senior Fullstack Engineer at 8returns, you’ll have a direct impact on reducing the environmental and financial burden of e-commerce returns. With ownership over key product areas, you’ll help us scale from a powerful niche player into a global platform. If you thrive in a dynamic, fast-moving setting and want to be part of a small team solving global challenges, 8returns is where you’ll make a real difference.✨ About You (musts)You have 3+ years of experience shipping production web apps with Rails and ReactYou’re a builder first you care more about delivering value than arguing about patternsYou’re comfortable jumping between frontend, backend, APIs, and data modelsYou’ve got strong product instincts, you think about UX, not just codeYou can handle ambiguity and tradeoffs without freaking outYou’re proactive, opinionated, and fast - you don’t wait to be told what to do Would be a strong plusExperience with Postgres, Heroku, AWSYou’ve worked in early-stage SaaS or marketplace toolsYou’ve played with AI tools (ChatGPT, Claude, LangChain, etc.) and see them as part of your workflow Key ResponsibilitiesShip new features end-to-end using Rails, React, and PostgresImprove performance, reliability, and developer experience across the stackOwn parts of the product and drive technical decisions. We’re not big on layers of abstraction or committeesJump into support, bugs, or integration issues when needed - but always with the goal of building systems or tools that make them disappearWork closely with the founders and PM to prioritize ruthlessly and ship what mattersTinker with AI to find ways we can work faster, automate more, or build new things we couldn’t beforeBenefits at 8returnsWe’re async-first, low-meeting, high-ownershipWe value shipping fast over debating for weeksWe run lean, stay profitable, and reinvest in productWe care deeply about our merchants and solve real pain - not vanity metricsHiring ProcessWe believe great hiring is about mutual fit, not hoop-jumping. Our process is straightforward, focused, and respectful of your time—no take-home tasks, no unnecessary steps. Intro Call (20 min)Technical Deep Dive (45-60 min)Case Interview (60-90 min)—a collaborative session (not a test)Meet the Team (optional)Reference Checks (optional)Offer! If this sounds exciting, we’d love to talk to you!! Apply to this Job