At 8returns were transforming one of the most frustrating environmentally damaging and costly aspects of e-commerce: returns. Trusted by the fastest-growing DTC names like OACE PEGADOR GOT BAG and now adopted by iconic brands such as Fielmann Tommy Hilfiger and Reebok were inventing what's next in post-purchase. As a Backend Software Engineer at 8returns you'll own the systems that make our product fast reliable and scalable. From APIs to data models to integrations you'll build the foundation that turns returns chaos into margin protection. If you care about clean architecture love shipping and want real ownership this is your role.
Tasks
* Ship new backend features with Rails and PostgreSQL
* Design and maintain APIs that power our frontend and external integrations
* Improve performance reliability and developer experience across the stack
* Own core data models and workflows that merchants rely on daily
* Debug and fix issues quickly but always aim to build long-term solutions
* Explore ways to integrate AI / automation to make systems smarter and faster
* Work closely with founders and PM to prioritize what matters most
Requirements
* 3 years building production web apps with Rails
* Strong database skills (PostgreSQL schema design query optimization)
* Solid understanding of backend architecture and API design
* You’re you solve problems not just write code
* Comfortable with ambiguity and tradeoffs; you keep moving
* Autonomous. We give you problems not solutions
Bonus points
* You’ve worked in an early-stage SaaS startup or as a founder
* You know your way around Heroku / AWS / infrastructure basics
* You’ve dabbled in AI / LLMs (OpenAI Claude LangChain etc.)
* You can jump into React / TypeScript when needed
Benefits
* Direct impact on millions of users
* Own what you build no layers of approval
* Low-meetings high-ownership culture
* Work directly with the founders
* Berlin-based flexible hybrid setup
* Meaningful equity in a profitable fast-growing company
Ready to build the backbone of the future of e-commerce Lets talk.
Required Experience : Senior IC
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