Senior Software Engineer I

Ideally you'll have:

• Strong experience developing backend applications, ideally with TypeScript or the ability to pick it up quickly
• A solid understanding of event-driven systems and working with queues
• Confidence working with cloud infrastructure (AWS preferred), particularly serverless technologies
• Experience with database design, optimisation, and maintenance (SQL or NoSQL)
• A passion for building high-quality software and solving real customer problems
• Strong communication and collaboration skills, with an interest in mentoring and knowledge sharing
• A proactive mindset and the ability to operate effectively in ambiguous or evolving environments

What will set you apart:

• Some exposure to frontend development, such as React

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
• 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. 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. 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 join the Kaluza Technology community, working on the Energy Retail platform, a scalable SaaS product supporting energy retailers and decarbonisation efforts. In this role, you'll build and maintain backend services using TypeScript, contributing to event-driven systems that power reliable, real-time features. You'll collaborate with product managers, designers, and engineers to deliver customer-focused solutions, while taking ownership of services from design through to production. Along the way, you'll work with cloud technologies like AWS, optimise performance and data models, and contribute to a collaborative engineering culture.