Job Overview
Join Kaluza as a Senior Engineer I to work on our Energy Retail platform, an SaaS technology that revolutionises operating platforms for energy retailers worldwide. The role is hybrid, based in London, Bristol or Edinburgh.
Salary: £63,000 – £81,000
Reporting to: Software Engineering Manager
Location: London / Bristol / Edinburgh – Hybrid
Visa sponsorship: At this time we are not able to offer visa sponsorship for this role. 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.
Responsibilities
* Design, build, and maintain scalable backend services using TypeScript and other modern technologies.
* 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) – short call to tell you more about Kaluza and the specific team you’ll be joining.
First stage interview (1 hour) – interview with a hiring manager covering mindset, technical questions, and a 15‑minute coding exercise.
Final Interview Loop (3 hours total) – behavioural interview, system design interview, and pairing interview. The loop covers the following:
* Behavioural – understanding collaboration, problem solving, and value creation.
* System Design – approach complex, high‑scale problems, real‑time data, and reliable, secure, scalable systems.
* Pairing – clean code, real‑time collaboration, practical task with an engineer.
Kaluza Values
* We’re on a mission.
* We build together.
* We’re inclusive.
* We get it done.
* We communicate with purpose.
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 – an additional 8 days to choose when you like
* Progressive leave policies with no qualifying service periods, including 26 weeks full pay for new family additions
* Dedicated personal learning and home office budgets
* Flexible working – we trust you to work in a way that suits your lifestyle
* And more…
We want the best people
We’re keen to meet people from all walks of life. Our perspective is that inclusivity leads to better work. We recognise talent on the basis of merit and potential and encourage anyone who feels aligned with our needs to apply.
How to Apply
Apply through our careers site or reach out via LinkedIn. Referrals increase your chances of interviewing at Kaluza by 2x.
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