Senior Platform Engineering

⭐ You'll thrive in this role if you:

• Have 8+ years in software engineering with 3+ years in a senior IC role owning developer platform, developer experience, or data platform work.

• Have straddled backend and data engineering deliberately.Fluent TypeScript / NestJS, comfortable in Python, experience with a data warehouse (Snowflake, BigQuery, Redshift, or equivalent).

• Have owned DevEx as a first-class product with measurable outcomes:build times, test flakiness, PR turnaround.

• Have taken over a system from a single point of failure.You know how to do knowledge transfer well.

• Have opinions about test infrastructure at scaleand can defend the choices you made in a real codebase.

• Have shipped data quality automation:Great Expectations, dbt tests, custom frameworks. You know invariants matter more than assertions.

• Are AI-native in your engineering practice(Claude Code, Cursor, or equivalent) and have views on where AI helps and where it does not.

• Communicate in writing first and are comfortable with an ambiguous, broad charter you will shape as much as inherit.

💚 Why Join Cozero?

• Real technical challenge -You're joining a growing system with real complexity. Work directly reduces carbon emissions at scale. Not theoretical, actual tons of CO2.

• Actual climate impact - Series A funded, growing fast, working with enterprise customers who trust us with their decarbonization journey.

• Exceptional team -Work directly with our founders. And 10+ engineers across Germany, Portugal and the UK. Multicultural, senior-leaning, collaborative, and actually passionate about climate action.

• You'll grow fast - Flat hierarchy.Your ideas ship. Direct impact on product and strategy.

📍 Where You'll Work

Fully remote within Germany, United Kingdom, Portugal or Spain.

🌱 Benefits

• 27 vacation days + 1 day life event leave(Wedding, Birth of child etc.) + national holidays (Depends on location).

• 500 EURannual learning and development budget.

• 500 EURone-time home office setup.

• 100 EURmonthly coworking budget (for those outside Berlin headquarters).

• VSOP (Virtual Stock Options) -share in Cozero's success.

• Regular team events every year

We're committed to building diverse teams and creating an inclusive workplace. We welcome applications from all qualified candidates regardless of ethnic origin, gender, religion or belief, age, or sexual identity. Our recruitment process is fair, objective, and based solely on the skills and qualifications required for this role.