Senior Python Engineer

About Us

Do you want to work on the most pressing problem of our generation? Do you have experience building great products and know what it’s like to roll up your sleeves and execute well, while building a company around you for the long term? If you truly know what it feels like to fly the plane while trying to build it, we want to hear from you. We’re looking for the best software engineers in the world to join a growing series A startup. At CarbonChain we see the climate crisis as a transformative opportunity for the global economy, and a rewarding career opportunity for those excited to take on the challenge in a rapidly growing market.

Decarbonizing the economy requires a granular, real-time view of where emissions come from and how they might be reduced. We’ve built software to automate the carbon footprinting of supply chains so their emissions can be measured and managed down. Banks, traders, and manufacturers use our product to tame the complexity of international supply networks, identify the most carbon-intensive parts, and find greener alternatives. Having developed technology which is significantly ahead of other solutions, we are now investing heavily in market adoption.

To join CarbonChain, you’ll need a proven career path in software engineering building great products that delight customers. Our company is made up of passionate people with expertise ranging from oil refining to deep learning but we know that there’s a lot we don’t know, and we’re hoping you can help fill that gap.

About the Role

We’re looking for a highly motivated and experienced Backend Python Engineer to help scale our product, infrastructure, and core data pipelines. You’ll play a key role in shaping the technical foundation of our platform and working with a collaborative team of engineers, product managers, and sustainability experts.

What You’ll Do

• Design and implement robust, scalable backend services using Python (FastAPI preferred).
• Build and maintain core APIs that power customer workflows and third-party integrations.
• Work with data engineering to ingest, transform, and expose environmental and operational datasets.
• Ensure high system reliability and performance by writing testable and maintainable code.
• Collaborate closely with the product and design teams to iterate quickly on features.
• Implement best practices for code quality, CI/CD, observability, and infrastructure-as-code.
• Participate in technical architecture discussions and make foundational decisions.

Requirements

• 4+ years of backend engineering experience, with a strong focus on Python.
• Proficient in developing RESTful APIs and integrating with external services.
• Solid experience with PostgreSQL, Docker, and cloud platforms. GCP preferred.
• Familiarity with distributed systems, background processing (e.g., Celery), and message queues (e.g., PubSub).
• Experience working in early-stage startups or fast-paced environments.
• A product-minded approach: you think about how your work impacts users.
• Passion for climate solutions and a genuine interest in sustainability.
• An ability to work in our London office 3 days per week in Camden Market

Nice-to-Have

• Experience with data-intensive applications or carbon accounting platforms.
• Knowledge of carbon footprint methodologies or ESG reporting.
• Contributions to open-source projects or technical blogs.

What We’re Offering

CarbonChainer’s receive a ton of great benefits, including:

• 28 days of annual leave
• Home office set up allowance of £500
• £2,000 annual learning allowance
• Private healthcare
• Generous parental leave policy
• Team lunches once a week in the office
• Subsidized gym classes, office gym, and cycle to work scheme.

We're striving to build a diverse team and we would love to hear from applicants from backgrounds less frequently represented in technology, be that in terms of gender, race, or professional background. If you think your skills and experience match what we’re look