Senior Backend Engineer, Elixir and Phoenix

About the role

A hands-on senior engineering role extending and maintaining a custom e-commerce platform, migrating features from a legacy backend and owning quality through release.

What you will do

• Build and maintain backend services, APIs and core features in Elixir and Phoenix
• Move business logic from legacy services into the core platform
• Clarify requirements with stakeholders, weigh trade-offs and split complex work into steps
• Document architecture decisions, refine existing code and fix performance and reliability issues
• Test critical paths and edge cases before QA and validate releases through monitoring
• Lead code reviews, mentor developers and improve CI/CD and engineering practices

What they look for

• At least five years of relevant technical experience
• Strong Elixir and Phoenix skills, or senior experience with a similar functional, concurrent framework
• Experience building reliable systems under many concurrent requests
• Solid debugging and problem-solving ability
• REST APIs, automated testing and CI/CD experience
• Ability to work independently and turn incomplete requirements into a clear plan

Nice to have

• Full-stack work with React, Next.js and TypeScript

Benefits

• Remote work anywhere in Germany
• A proactive career development programme
• English as the company language