Job title: Engineer II
Location: London / Bristol / Edinburgh - Hybrid
Salary: £45,000 - £60,000
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 engineers building data-led and product-focused software at scale. We care deeply about engineering quality and collaboration, and we support each other in continuously improving how we build and operate our systems.
In this role, you’ll work on Kaluza’s Energy Retail platform, a SaaS product that helps energy retailers operate more effectively and supports the decarbonisation efforts of Kaluza’s customers. The platform is built with scalability and reliability in mind, and you’ll contribute to systems that are used in production at meaningful scale.
You’ll focus primarily on building and improving backend services, working alongside experienced engineers who will support your development and growth. You’ll collaborate closely with product and engineering partners to deliver reliable, well-designed solutions.
Our tech stack evolves over time, but you can expect to work with technologies such as:
TypeScript, Node.js, GraphQL, Kafka, AWS, Terraform, Docker, Kubernetes, and CI tooling.
Responsibilities
- Build, maintain, and improve backend services using TypeScript.
- Contribute to event-driven systems that process data reliably and in near real time.
- Work closely with product managers, designers, and other engineers to deliver user-focused features.
- Write clean, well-tested code and take part in code reviews to uphold high engineering standards.
- Take ownership of well-defined services or components, with support from more experienced engineers.
- Work with SQL and NoSQL databases to store and retrieve data effectively.
- Help deploy and operate services on cloud platforms, particularly AWS and serverless infrastructure.
- Contribute positively to team culture through collaboration, knowledge sharing, and continuous learning.
About You
- Professional experience developing backend applications.
- Experience with TypeScript, or strong experience in another language and a desire to work with TypeScript.
- Some experience or exposure to event-driven systems or message queues (e.g. Kafka, SQS).
- Familiarity with cloud environments, ideally AWS.
- Comfortable working with databases (SQL or NoSQL) and an understanding of basic trade-offs.
- A collaborative team player who communicates clearly and enjoys problem-solving with others.
- Curious, motivated, and keen to grow as an engineer.
Bonus: Exposure to front end development, such as 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
We aim to run a fair and transparent interview process that gives you a clear picture of the role and plenty of opportunity to show how you work.
Initial Call with Talent Acquisition (30 minutes)
A short introductory call to tell you more about Kaluza, the team, and the role, and to check that this opportunity is a good mutual fit.
First Stage Interview (1 hour)
A conversation with a hiring manager from one of our engineering teams. This interview covers both technical topics and mindset. It also includes a short 15 minute coding exercise, so please be prepared to share your screen and write some code.
Final Interview Loop (up to 3 hours total)
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:
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.
