Principal Engineer, Cozero
+ Virtual Stock Options
More information about location
Carbon accounting & climate management solution
Open for applications
Carbon accounting & climate management solution
21-100 employees
Open for applications
+ Virtual Stock Options
More information about location
21-100 employees
Company mission
To enable companies to effectively decarbonize and transform their business sustainably in light of financial implications.
Role
Who you are
- Have 10+ years in software engineering, with demonstrated experience leading technical direction across a team, whether in a formal Staff/Principal title or equivalent scope
- Have led technical direction across a team of 5-15 engineers without being the manager - through RFCs, prototypes, and earning trust
- Think in end-to-end systems - you can trace a data quality issue from a customer-facing report back through the analytics layer, processing pipeline, queue, and ingestion point
- Have shipped a major system rewrite or migration incrementally - feature flags, phased rollouts - in a system where correctness matters as much as uptime
- Are fluent in TypeScript/Node.js and comfortable with AWS (ECS, Lambda, SQS, Aurora)
- Have a hands-on experience with queue-based architectures (SQS FIFO, Kafka) at scale
- Have a DevOps mindset - you own what you build, from technical design to deployment, monitoring, and operational health
- Care about observability as a discipline - SLOs, dashboards, runbooks, post-mortems that become preventive guardrails
- Communicate clearly in writing - tradeoff framing that other engineers actually read and reference
Desirable
- Familiarity with analytics layers (Cube.js, Snowflake, CDC pipelines)
- Climate tech, carbon accounting, or compliance-grade data systems
- Series A/B startup experience
What the job involves
- We are looking for a passionate Principal Engineer to help us transform every company into a sustainable business
- 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 (m/f/d) 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!
- 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 design through production: release, observability, and long-term maintainability
- Engineering standards through tech doc reviews, architectural decisions, and reusable patterns that raise quality without slowing delivery
- Technical decision-making across the team - resolving cross-domain disagreements with clarity, data, and written proposals
- Knowledge distribution, mentoring engineers and building habits that reduce single points of failure
- 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 9+ 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
Our take
Climate change and conflicts continue to challenge energy companies, leading to an unprecedented demand for more commitment to renewable raw materials from all stakeholders. For companies, this means it is now no longer a luxury to save CO2 emissions where possible.
Cozero is a software company that creates products to fit that need. The startup was founded to enable companies to effectively decarbonise. It differentiates itself from competitors by framing these CO2 savings in the language of business - each measure details CO2 saved per Euro invested.
With over 70 enterprise customers, the company's next steps will involve accelerating its international expansion and advancing its Climate ERP solution. Having already helped cut Vodafone's media carbon footprint by a third, the company is well set for even greater success as it continues to grow.
Freddie
Company Specialist at Welcome to the Jungle
Insights
Company
Funding (1 round)
Apr 2024
$7.5m
SERIES A
Total funding: $7.5m
Company benefits
- VSOP: As a valued team member, you'll have the opportunity to join our VSOP pool, allowing you to share in the company's financial success
- 27 days of vacation: We offer 27 days of paid time off on top of national holidays, no matter where you are based
- Flexible working hours: Trust is the backbone of our culture, so you have the autonomy to set your own work hours. We recognize that work-life balance varies for each individual, so you are encouraged to adjust your schedule to suit your personal needs, whether that's spending time with family or focusing on your health and well-being
- Learning budget: You will have a budget of EUR 500 per year to allocate towards any learning and development activities of your choice. You have the freedom to select whatever you believe is best for your growth
- Work from home budget: You will receive a one-off payment of EUR 500 to purchase any equipment you need for your remote office. We provide you with a Mac
- Work from anywhere: We fully embrace remote work and its flexibility. However, we must adhere to the tax regulations specific to each country
- In-person Gatherings: There's nothing like in-person connections to boost team spirit. That's why we organize two types of gatherings: company-wide events twice a year and team-focused meetups twice a year
Company HQ
Prenzlauer Berg, Berlin, Germany
Leadership
Fabian Schwarzer
(Co-Founder & COO)Previously a Senior Consultant at Roland Berger.
Helen Tacke
(Co-Founder & CEO)Preciously a Partner at a family office investment fund. Also previously Co-founded VEECEE, a networking platform for Venture Capitalists.
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