Software Engineer II - API Platform

Job title: Engineer II

Location: London / Bristol / Edinburgh - Hybrid

Salary: £45,600 - £60,000

Team: API Platform

Reporting to: Software Engineering Manager

At this time, we are not able to offer visa sponsorship for this role. We are committed to building a diverse, global team and our sponsorship policy is evaluated on a role-by-role basis. We encourage you to keep an eye on our careers site to stay informed about future opportunities where we are able to offer visa sponsorship.

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.

Our platform orchestrates millions of real-time decisions across homes, devices, markets and grids. By combining predictive algorithms with human-centred design, Kaluza makes clean energy dependable, affordable and adaptive to everyday life.

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.

Where in the world of Kaluza will I be working?

You'll be joining the Kaluza Technology community. We’re a diverse group of both data-led and product-focused engineers, pushing the boundaries of technology and working at an extraordinary scale. We strive for engineering quality & innovation, continuously improving our best practices across our highly collaborative community.

The API Platform team is a newly combined team of software engineers within the Client Integrations squad responsible for building & supporting the retail platform-critical components of Kaluza’s GraphQL API (KaPI) & event gateway (KEG) solutions. Our vision is that Kaluza is the easiest, most intuitive retail platform with which to integrate - our API Platform sits alongside our other large-scale analytical offering (KDM) to provide a coherent, low latency way for retail clients to maintain and find their data.

Core technology-wise, we use Scala, GraphQL and DynamoDB, alongside Kafka & Avro. We deploy on to our internal Kubernetes platform with Terraform & Aiven as our IaC and GitHub for code repositories and workflows..

What will I be doing?

• Driving Delivery: Independently execute a mix of discovery spikes and technical debt resolution to enhance our GraphQL API (KaPI) and event gateway (KEG).

Evolving API Offerings: Take the lead on evolving our API products to meet the rapidly growing needs of our global client base.

Improving Developer Experience: Focus on improving the tooling and usability for various internal teams who expose their domains via our API products.

Ensuring Platform Reliability: Provide essential in-hours support as part of a team rota to maintain high-availability retail platform components.

System Evolution: Pair or "swarm" with teammates to improve shared services and products, ensuring architectural consistency across the platform.

Community Contribution: Represent the API Platform team in broader engineering forums, including platform health reviews and post-mortems.

About You

Ideally you’ll have/be:

• Well-Rounded Engineer: Strong backend development experience, primarily with TypeScript, and a solid grasp of tool proficiency in a production environment.
• Operational Ownership: Proven ability to work independently and take the lead on tasks within a small, high-impact team.
• Problem Solver: Experience working with CI/CD pipelines and Infrastructure as Code (IaC) to support modern software delivery.

Collaborative Spirit: Excellent communication skills with an interest in working within a highly integrated, cross-functional squad.

What will set you apart:

• Functional Programming & Scala: Familiarity with functional programming concepts and a strong interest or experience in Scala (our core service language).
• GraphQL Expertise: Experience maintaining services that expose GraphQL interfaces.
• Cloud & Data Expertise: Familiarity with AWS components, Kubernetes, DynamoDB, or event-driven architectures using Kafka and Avro.
• SRE Awareness: Knowledge of Site Reliability Engineering concepts, including disaster recovery and proactive monitoring.
  
  

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.

We understand some people may not apply for jobs unless they tick every box. But if you're excited about joining us and think you have some of what we're looking for, even if you're not 100% sure, we'd still love to hear from you.

Find out more about working at Kaluza on our careers page and LinkedIn.

You can also find our Applicant Data Protection Policy here.