Senior Python Engineer - London

Job summary

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.

Responsibilities

• 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.

Job description