Senior Software Engineer I

• Design, build, and maintain scalable backend services using TypeScript and

• Work with event-driven systems and message queues to power real-time, reliable features.

• Collaborate with product managers, designers, and other engineers to build customer-focused solutions.

• Lead by example - contributing to high-quality code, mentoring others, and fostering best practices.

• Own services end-to-end, from architecture to production monitoring and continuous improvement.

• Optimise system performance and data design, working with SQL or NoSQL databases as appropriate.

• Leverage cloud platforms (especially AWS) and serverless architectures to build reliable, scalable solutions.

• Contribute to a positive engineering culture by sharing knowledge and supporting your team.

Do you have experience in TypeScript?, * Solid experience developing backend applications, ideally in TypeScript or a willingness to pick it up quickly.

• Understanding of event-driven systems and working with queues
• Extremely comfortable working with cloud infrastructure (AWS preferred), especially serverless technologies.
• Experience with database design, optimisation, and maintenance (SQL or NoSQL).
• Passionate about high-quality software and solving real customer problems.
• Strong communication and collaboration skills - you enjoy mentoring and knowledge sharing.
• Proactive mindset and ability to thrive in ambiguity.

The final stage consists of three interviews. These are usually scheduled across multiple sessions, though we can accommodate completing them in a single day if you prefer.

• Behavioural Interview Focuses on collaboration, problem-solving, and how you deliver value for customers, using real examples from your experience.

• System Design Interview Explores how you approach complex, large-scale problems, such as designing scalable, reliable, and secure systems.

• Pairing Interview A collaborative session where you'll work through a practical task with one of our engineers, focusing on problem-solving, clean code, and communication.

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
• Flexible bank holidays, giving you an additional 8 days which you can choose to take whenever you like
• 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. 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. As we're scaling rapidly, we have a number of opportunities available across different teams and levels. The specific role you move forward with will be shaped as we progress through the interview process - allowing us to assess where your experience can have the greatest impact, with the right support around you to enable both your growth and that of the team. Our Talent Acquisition team will guide you through the details as we go. What will I be doing? You'll be joining the Kaluza Technology community. We're a large team of both data-led and product focused Software and Production Engineers, pushing the boundaries of technology and working at an extraordinary scale. As a collective we strive for engineering greatness and by ensuring best practices across the board of the community. More specifically, you'll be working on Kaluza's Energy Retail platform. This is a SaaS technology platform that aims to revolutionise the operating platforms for energy retailers globally. This platform has been built with scale and technical quality in mind and is the foundation for decarbonisation efforts by Kaluza's customers. Our tech stack is very fluid, but broadly you can find yourself working with: Typescript, Node JS, Terraform, Gitactions, Kubernetes, Docker, AWS, Kafka, GraphQL