Software Engineer II (API Platform)

Ideally you'll have:

• Experience building backend services, ideally with TypeScript, and confidence working with production systems and tooling.
• The ability to work independently and take ownership of tasks, while contributing to a small, high-impact team.
• Experience using CI/CD pipelines and Infrastructure as Code (IaC) to support modern software delivery practices.
• Good communication skills and a collaborative approach to working within cross-functional teams.

What will set you apart:

• Experience building or maintaining services that expose GraphQL interfaces.
• Familiarity with AWS, Kubernetes, DynamoDB, or event-driven architectures using Kafka and Avro.
• An understanding of Site Reliability Engineering concepts, such as monitoring, resilience, and disaster recovery.

This stage includes three sessions, usually scheduled separately, though we can accommodate completing them in a single day if you prefer:

• Pairing - A collaborative session where you'll work through a practical task with one of our engineers, focusing on problem-solving, clean code, and communication.
• System Design - Explores how you approach more complex problems, including designing scalable, reliable systems.
• Behavioural - Focuses on collaboration, problem-solving, and how you deliver value for customers, using real examples from your experience.

Kaluza Values

Here at Kaluza we have five core values that guide us as a business:

Play to win, Solve the real problem, Build trust every day, Own the outcome, Go further together

From us you'll get

• Pension Scheme
• Discretionary Bonus Scheme
• Private Medical Insurance + Virtual GP
• Life Assurance
• Access to Furthr - a Climate Action app
• Free Mortgage Advice and Eye Tests
• Perks at Work - access to thousands of retail discounts
• 5% Flex Fund to spend on the benefits you want most
• 26 days holiday
• Progressive leave policies with no qualifying service periods, including 26 weeks full pay if you have a new addition to your family
• Dedicated personal learning and home office budgets
• Flexible working - we trust you to work in a way that suits your lifestyle
• And more…

Even better? You'll have access to these benefits from day 1 when you join.

We want the best people

We're keen to meet people from all walks of life - our view is that the more inclusive we are, the better our work will be. We want to build teams which represent a variety of experiences, perspectives and skills, and we recognise talent on the basis of merit and potential.

Kaluza is the Energy Intelligence Platform, turning energy complexity into seamless coordination. We help energy companies overcome today's challenges while accelerating the shift to a clean, electrified future. Leveraging Data, AI, and real-time decision-making we turn energy complexity into growth opportunities for our partners. By combining predictive algorithms with human-centred design, Kaluza makes clean energy dependable and affordable. With teams across Europe, North America, Asia and Australia, and a joint venture with Mitsubishi Corporation in Japan, we power leading companies including OVO, AGL and ENGIE, as well as innovators like Volvo and Volkswagen. What will I be doing? You'll take ownership of delivering a mix of discovery work and technical improvements, helping to evolve our GraphQL API and event gateway to meet the needs of a growing global client base. Alongside building and enhancing these core platform services, you'll focus on improving the developer experience for internal teams using our APIs, making them easier to work with and more reliable. You'll collaborate closely with teammates to refine shared systems and ensure consistency across the platform, while also contributing to keeping services running smoothly through team support and on-call participation. As part of the wider engineering community, you'll represent the API Platform team in forums such as health reviews and post-mortems, helping to continuously improve how we build and operate our systems.