🌍 About us - Join our mission to fight climate change

We’re building the carbon accounting platform that enterprises trust for compliance reporting and decarbonization decisions. We're Series A funded (€6.5M from Kvanted and ENV), working with enterprise customers, and at an inflection point: quality can't stay distributed across engineers anymore. We need someone to own it.

If you want to build QA practices that directly impact how companies measure and reduce their carbon footprint, keep reading.

We are looking for a QA Lead to build and own the quality discipline across our engineering team from the ground up. Your mission is to build test automation, data validation frameworks and quality practices that scale with us. 

We need someone who can define what "quality" means for a data-intensive platform, build the testing strategy and tooling to enforce it, and partner with engineers to make quality a habit rather than a gate. 

We are open to hiring fully remotely for this role within Europe timezone. 

🎯 What you’ll do

• Define and own the testing strategy across the platform - unit, integration, E2E, and data validation testing for a system that spans APIs, async pipelines, and analytics layers

• Build test automation that gives engineers fast, reliable feedback - so quality is caught before production, not after

• Establish data correctness validation - our platform calculates CO2 emissions from raw activity data, and the numbers must be auditable and accurate

• Partner with engineers to embed quality into their development workflow - not as a gate at the end, but as a practice throughout

• Own the QA process for releases - coordinate validation across review environments, define what "ready for production" means, and make sure nothing ships without confidence

• We are not looking for a tester. You’ll create a robust QA framework that supports engineers to test their own work, and embeds testing and automation into our delivery lifecycles, so that manual testing is the fallback mechanism and not the norm.

⭐ You'll thrive in this role if you:

• Bring 8+ years of experience in Software Engineering with 3+ years in QA/quality engineering. 

• Are a QA-centric Software Engineer that understands code and architecture

• Are DevOps-first, and have experience embedding QA practices with tools, scripts and frameworks

• Have built QA practices from scratch, or significantly matured them

• Think about quality as data correctness, not just "no bugs" - you've tested systems where wrong output is worse than a crashed page

• Are hands-on with test automation - you write and maintain E2E and integration tests, not just test plans

• Understand async and event-driven systems - you know how to test pipelines where data flows through queues and gets processed asynchronously

• Care about developer experience - the test infrastructure you build is fast, reliable, and something engineers actually want to use

• Can work across the full stack - comfortable validating frontend behavior, API responses, database state, and calculated outputs

• Communicate clearly with both engineers and product - you can explain what's risky about a release and what needs more validation without creating bottlenecks

Nice to have

• Experience with TypeScript/Node.js test frameworks (Jest, Playwright, Cypress)

• Familiarity with AWS services from a testing perspective(Lambda, SQS, ECS)

• Experience testing data pipelines, ETL, or analytics systems

• Climate tech, carbon accounting, or compliance-grade data systems

• Series A/B startup experience
  

💚 Why Join Cozero?

• Real impact - Your quality ensures enterprises get accurate carbon data. That accuracy drives real decarbonization decisions. 

• Right timing - Early enough to shape everything, mature enough to have real users depending on quality.

• Exceptional team - Work directly with our founders Helen, Fabian, and Tiago. Multicultural, collaborative, and actually passionate about climate action—not just talking about it.

• You'll grow fast - Flat hierarchy. Your ideas ship. Potential to build a QA team as we scale.

📍 Where You'll Work

Fully remote within Europe.

🌱  Benefits

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

• 500 EUR annual learning and development budget

• 500 EUR one-time home office setup

• 100 EUR monthly 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.