Senior Software Engineer II (Front End) in Bristol

Location: London / Bristol / Edinburgh - Hybrid

Salary: £76,800 - £96,000

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.

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.

In this role, you’ll work specifically on the Enterprise Experience team which maintains Kaluza’s design system, Nebula, as well as supporting all front-end contributors to our enterprise platform. You will also support cross-cutting features within the platform itself. The platform is built with scale, performance, and technical quality at its core, and plays a key role in enabling decarbonisation for Kaluza’s customers.

This is a front end focused engineering role, with occasional backend tasks. Your primary responsibility will be evolving our enterprise design system, establishing strong accessibility patterns, and ensuring domain teams have what they need to create consistent, accessible, and evolving large-scale React applications used by customers and internal teams. While the role is mainly front end development, you’ll collaborate closely with backend and platform engineers and have exposure to cloud-based systems that support the frontend experience.

Responsibilities

• Design, build, and maintain scalable front end applications using TypeScript and React.
• Work closely with product managers and designers to deliver high-quality, customer-focused user experiences.
• Build and maintain shared frontend platforms, patterns, and tooling that support hundreds of contributors.
• Lead by example through high-quality code, thoughtful technical decisions, and mentorship.
• Take ownership of frontend systems through development, testing, release, and ongoing improvement.
• Collaborate with backend and platform teams to ensure frontend solutions integrate cleanly and perform reliably.
• Contribute to a positive engineering culture through knowledge sharing and continuous improvement.

About You

• Strong experience building and maintaining frontend applications with TypeScript and React.
• A passion for Design Systems and working closely with designers.
• Strong experience creating accessible UI patterns and testing against accessibility standards.
• Deep understanding of React patterns and techniques for scaling frontend codebases and teams.
• Experience writing end-to-end tests for frontend applications.
• Comfortable working in a cloud-based environment and collaborating across platform and backend boundaries.
• Passionate about building high-quality software that solves real customer problems.
• Strong communication skills and an interest in mentoring and supporting other engineers.
• Proactive, adaptable, and comfortable working in evolving problem spaces.
• Bonus: Experience with monorepo tooling such as Nx or Turborepo.

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.