Principal Engineer - (m/f/d) - Remote in DE/UK/PT

Job description

🌍 About the role Cozero's platform turns enterprise activity data into auditable CO2 numbers. Our platform is trusted by large enterprise customers with their full decarbonization journey. We are at an inflection point. The codebase works. The customers are real. The complexity is growing faster than the team. Looking for a Principal Engineer who can own our codebase quality and partner with our Head of Engineering in ensuring a purpose-fit architecture across our platform. You’ll be the most senior IC on our engineering team, partnering with our Head of Engineering to define and drive the most impactful technical initiatives of 2026, and raise our bar from “works most of the time” to finance-grade reliability. If you're excited about building an economy where every company creates an impact for a sustainable world and empowering companies to decarbonize and boost their business performance, we’d love to hear from you! 📍Fully remote - Germany, United Kingdom or Portugal. 🎯 What you’ll own: Technical architecture of our data platform (NestJS, Aurora PostgreSQL, SQS, Lambda, Cube.js/Snowflake) and its evolution toward reliability and scale. Cross-cutting technical initiatives from de...