Senior Software Engineer (Rails)

8returns

Berlin💼 Full-time🗓 2025-07-30 → 2026-07-31

Core

Building the backend systems for an e-commerce returns platform that serves merchants and consumers.

Role type

Senior Backend Software Engineer (Rails)

Builds

APIs, data models, and integrations for a post-purchase returns platform

Domain

E-commerce / SaaS

Deliverable

production ML models | product features

Required skills

Ruby on Rails, PostgreSQL, API design, backend architecture, query optimization, system debugging

Preferred skills

Early-stage SaaS experience, AWS/Heroku, AI/LLMs (OpenAI, LangChain), React/TypeScript

Technologies

Rails, PostgreSQL, Heroku, AWS, OpenAI, LangChain, React, TypeScript

Responsibilities

Ship new backend features, design and maintain APIs, improve performance and reliability, own core data models and workflows, debug issues, explore AI/automation integrations

Seniority

Senior, hands-on IC

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