Software Engineer II (Front End) in Bristol

Location: London / Bristol / Edinburgh - Hybrid

Salary: £46,000 - £60,000

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 join the team building Kaluza’s Energy Retail platform, a SaaS product modernising how energy retailers operate globally. This is a frontend focused role centred on large scale React applications used by both customers and internal teams. You’ll design, build, and evolve complex user interfaces that sit on top of high volume, distributed systems. The frontend is a critical part of how customers experience Kaluza’s platform, and engineering quality is a priority. We’re looking for engineers who are comfortable owning significant areas of the frontend, contributing to technical decisions, and improving systems over time, not just delivering tickets.

Responsibilities

• Design and deliver scalable frontend features using TypeScript and React.
• Take ownership of frontend domains from discovery through release and ongoing improvement.
• Contribute to architectural discussions and help shape patterns that support a growing codebase and contributor base.
• Build and maintain shared tooling, components, and standards that enable consistency across teams.
• Collaborate closely with product managers and designers to turn complex problems into intuitive user experiences.
• Work with backend and platform engineers to ensure robust, well integrated solutions.
• Write well tested, maintainable code and raise the bar through thoughtful code reviews.
• Identify and address performance, scalability, and technical debt issues proactively.

About You

• Professional experience building production frontend applications with TypeScript and React.
• Strong understanding of component architecture, state management, and patterns for scaling React applications.
• Experience delivering substantial features or systems with a high degree of autonomy.
• Comfortable reasoning about performance, reliability, and long term maintainability.
• Experience with end‑to‑end testing in modern frontend environments.
• Confident collaborating across disciplines and contributing to technical discussions.
• Motivated by solving real customer problems, not just shipping code.

Bonus: Experience with monorepo tooling such as Nx or Turborepo.

Our Interview Process

• Initial Call with Talent Acquisition (30 minutes) - An introduction to Kaluza, the team, and your experience.
• First Stage Interview (1 hour) - A technical and mindset discussion with a hiring manager, including a short live coding exercise.
• 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.

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. You can also find our Applicant Data Protection Policy here.