Senior Software Engineer

Location: Bristol, London or Edinburgh (hybrid, three days a week in the office) Level: Senior Engineer I C3 Team: Engineering Salary: £60,000 – £80,000 + discretionary bonus Contract: Permanent Reporting To: Software Engineering Manager Please note: This role requires an existing right to work in the UK. We can’t offer visa sponsorship, but we review sponsorship role by role, so keep an eye on our careers site for future opportunities. About Kaluza 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, 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 you'll do 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. Responsibilities: • Design, build, and maintain scalable backend services using TypeScript and Node.js • 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. Tech stack: Typescript, Node JS, Terraform, Gitactions, Kubernetes, Docker, AWS, Kafka, GraphQL What you'll bring Ideally, you'll have: • 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. Our Values Five values guide how we work at Kaluza: • Play to win: Collective pride in decarbonising energy at scale. • Solve the real problem: Cutting through complexity to focus on real-world outcomes. • Build trust every day: Consistency, transparency and doing what we say. • Own the outcome: Full accountability, wins and setbacks, without ego. • Go further together: Collaboration, respect and different perspectives. Our Perks • Time off and family: 26 days’ holiday, plus 26 weeks’ full pay for new parents with no qualifying service period • Health and security: Private medical insurance with virtual GP, life assurance, pension scheme, free mortgage advice and eye tests • Pay and flexibility: Discretionary bonus, a Flex Fund of 5% [of salar