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About the Role

We are looking for a Senior Backend Engineer who enjoys building reliable systems and taking ownership of their work, from clarifying requirements and making architectural decisions to writing, testing, and releasing code. You will help extend the capabilities of our custom e-commerce platform, maintain it, and progressively migrate functionality from our legacy backend into it.

Responsibilities

Build and maintain backend services, APIs, and core functionality in Elixir and Phoenix, including migrating business logic from legacy services.
Shape solutions with stakeholders by clarifying requirements, evaluating trade-offs, and breaking complex work into independently deliverable pieces.
Make and document architectural decisions, improve existing code, and resolve performance and reliability problems.
Own quality from implementation through release by testing critical paths, edge cases, and interactions between services before handing work to QA, and using monitoring to validate releases.
Lead code reviews, mentor other developers, and help establish coding, testing, and documentation standards.
Improve development tools, CI/CD, and engineering practices.
Keep delivery visible by coordinating dependencies, raising risks early, and communicating changes to scope or estimates.
Actively develop with AI tools and agentic development pipelines, defining architecture, coding standards, and rules, reviewing output, and validating results.

Requirements

At least five years of relevant technical experience.
Strong Elixir/Phoenix experience, or senior-level experience with a language or framework built on similar principles, particularly functional programming, concurrency, and message-based systems.
Experience building reliable systems that handle many concurrent requests.
Strong debugging and problem-solving skills.
Experience with REST APIs, automated testing, and CI/CD.
The ability to work independently, explain technical trade-offs, and turn incomplete requirements into a clear delivery approach.
Good knowledge of OTP, GenServers, Supervisors, LiveView, Ecto, and BEAM (for Elixir/Phoenix background).
Experience with PostgreSQL, Docker, Kubernetes, and monitoring tools is a plus.
Full-stack development experience is a plus, particularly with React, Next.js, and TypeScript.
A valid work permit for Germany is mandatory.
Residence in Germany is required.

Skills

Elixir
Phoenix
Functional programming
Concurrency
Message-based systems
REST APIs
Automated testing
CI/CD
OTP
GenServers
Supervisors
LiveView
Ecto
BEAM
PostgreSQL
Docker
Kubernetes
Monitoring tools
React
Next.js
TypeScript
AI tools
Agentic development pipelines

Location

Remote within Germany
Berlin (ideal)

Work Type

Remote-first
Full-time

Experience Level

Senior

Benefits

Proactive career development programme
Flexible working hours
Competitive salary
Choice of equipment (Mac/Windows)
Personal development budget
Internal coaching
Regular team events

About the Company

Pets Deli is the leading premium pet food D2C brand in Germany.
Our mission is simple and ambitious: create a better world for pet lovers.
We focus on three pillars: better and healthier food, informative and educational content, and digital services.

Equal Opportunity

We believe diverse perspectives make better teams. That's why we explicitly welcome applicants of all backgrounds, regardless of ethnicity, gender identity, disability, age, religion or belief, or sexual orientation.