Senior Engineer I

Job title: Senior Engineer I
Location: London / Bristol / Edinburgh - Hybrid
Salary: £63,000 - £81,000
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.
At Kaluza we embrace a flexible, hybrid work model that balances autonomy with the power of in-person connection. Many of our teams find value in coming together regularly to collaborate, strengthen relationships, and accelerate progress. We’re focused on shaping thoughtful, team-driven approaches that support both business impact and individual well-being.
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
Responsibilities
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.
About You
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.
Bonus: exposure to frontend development with React.
Why might this role not suit you?
We are going through a period of significant evolution which is exciting and with it brings lots of opportunity and challenging work, which is not for everyone. To be successful in this role, you will be excellent at operating in ambiguous, changing environments, balancing multiple priorities simultaneously and get enjoyment from making the complex, simple.
Our Software Engineering Interview Process
Initial call with our Talent Acquisition team (30 minutes)
This short call is designed to tell you more about Kaluza and the specific team you’ll be joining, as well as to ensure that the role is the right fit for you
First stage interview (1 hour minutes)
This interview will be with a hiring manager from one of our engineering teams, this interview will cover both mindset and technical questions. We will also incorporate a 15 coding exercise, so have your screen ready to do some coding.
Final Interview Loop (3 hours)
Three hours sounds like a long time, but we don’t expect all of these to be completed across one day, but we can support that if you so wish, the three sessions cover the following:
Behavioural - We use behavioural interviews to understand how you collaborate, solve problems, and build value for customers through real-world examples.
System Design - Our system design interview explores how you approach complex, high-scale problems — from handling real-time data to building reliable, secure, and scalable systems.
Pairing - Our pairing interview focuses on problem-solving, clean code, and real-time collaboration — you'll work through a practical task with one of our engineers.
Kaluza Values
Here at Kaluza we have five core values that guide us as a business:
We’re on a mission, We build together, We’re inclusive, We get it done, We communicate with purpose.
Read more about our values over on our careers site.
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.
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 in Kaluza on our careers page and LinkedIn .

Apply Now

Senior Engineer I

Job Details