Senior Software Engineer (Rails)

8returns GmbH; Berlin; Hybrid; EUR 60.000 - 80.000; Vollzeit

Zusammenfassung

A growing e-commerce solutions company in Berlin is looking for a Backend Software Engineer to develop backend features using Rails and PostgreSQL. The ideal candidate has over 3 years of experience in building production web apps and strong skills in API design and backend architecture. This role offers direct impact on product development within a low-meetings, high-ownership culture, allowing you to work closely with the founders in a flexible hybrid setup. Join us to revolutionize the future of e-commerce.

Leistungen

Direct impact on millions of users

High-ownership culture

Meaningful equity in a fast-growing company

Qualifikationen

• 3+ years building production web apps with Rails.
• Strong database skills in PostgreSQL, schema design, and query optimization.
• Solid understanding of backend architecture and API design.

Aufgaben

• Ship new backend features with Rails and PostgreSQL.
• Design and maintain APIs for frontend and external integrations.
• Improve performance and developer experience across the stack.

Kenntnisse

Rails development

PostgreSQL

API design

Problem-solving

Autonomous work

Tools

Heroku

AWS

Jobbeschreibung

At 8returns, we’re 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, we’re 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 pragmatic — you solve problems, not just write code
• Comfortable with ambiguity and tradeoffs; you keep moving
• Autonomous. We give you problems, not solutions

Bonus points if:

• 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

We run lean, stay profitable, and care about solving real merchant problems.

Ready to build the backbone of the future of e-commerce? Let’s talk.