Senior Software Engineering Manager (Global Billing, Payments & API )

Kaluza is an energy intelligence and optimisation software company that develops a vertically integrated platform designed to help energy providers manage and accelerate the transition to a cleaner, smarter energy system. The platform orchestrates billions of data points into a single, self-balancing network, enabling energy companies to streamline operations, enhance customer experience, and optimise energy flows in real time using data, AI, and automation. Kaluza serves leading energy providers across the UK, Australia, Europe, and Japan, and has been recognised as number one in the Frost & Sullivan Frost Radar Innovation Index 2025.

• Job title: Senior Software Engineering Manager (Global Billing, Payments & API)
• Location: London / Bristol / Edinburgh (Hybrid Office - 3+ days per week)
• Salary: £100,000 - £125,000
• Team: Global Billing, Payments & API)
• Level: PL2

This role is based in London, Bristol or Edinburgh and requires existing right to work in the UK.

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.

What will I be doing?
Kaluza runs the billing and payments engine behind some of the world's biggest energy retailers. Every bill sent and every payment collected across Kaluza's markets increasingly runs through one shared core platform, and GBPA exists to build and run that core, so foundational billing and payments capability gets built once and reused everywhere, rather than rebuilt separately for every new market or client relationship.

That matters because of where Kaluza is headed: as we grow into new markets and take on more of the world's largest energy retailers as clients, rebuilding core billing and payments capability separately for each one is slower, costlier, and more error-prone than building it once and configuring it at the edge. Getting this right directly shapes how fast Kaluza can bring new markets and clients onto the platform, and how reliable that platform is once they're on it.

We're also in the middle of reorganising how this part of the business works, moving from building billing and payments capability separately per area toward one shared global core that every area configures rather than rebuilds. Senior Engineering Managers across GBPA sit at the centre of that shift, each owning two domains rather than a single team. Responsibilities include:

• You'll lead engineering across two GBPA domains through complex, ambiguous, cross-squad initiatives.
• You'll own technical and product strategy across both domains simultaneously, rather than handing strategy off to a single team.
• You'll diagnose systemic and organisational issues using deep domain knowledge, not just resolve team-level technical problems.
• You'll manage cross-functional stakeholders across Product, Delivery, and adjacent engineering teams to align roadmap and trade-offs.
• You'll carry full people-leader ownership for both teams: goal-setting, performance and pay conversations, hiring and recruitment.
• You'll operate in a high-integrity data domain (billing and payments) where reliability and reconciliation come before speed.

About You
Ideally you’ll have/be

• Have a proven track record leading engineering team(s) through complex, ambiguous, cross-squad initiatives — not single-team delivery.
• Have experience owning technical and product strategy across multiple domains or services simultaneously.
• Have a track record of diagnosing systemic or organisational issues and resolving them with deep domain knowledge, not just fixing team-level technical problems.
• Be a strong cross-functional stakeholder manager, working with Product, Delivery, and adjacent engineering teams to align roadmap and trade-offs.
• Have full people-leader experience: goal-setting, performance and pay conversations, hiring and recruitment for the team(s) you lead.
• Be comfortable operating in a high-integrity data domain (billing or payments), where quality and reconciliation matter as much as delivery speed.
• Have a demonstrable record of applying AI/LLMs to deliver customer impact, not just adopting AI tooling internally.
• Have demonstrable customer obsession and a working-backwards practice: start from the customer problem and ship the simplest solution that solves it, rather than the most sophisticated one available.
• Have a track record of successfully navigating complex stakeholder and leadership dynamics, influencing the wider organisation beyond your direct scope to improve product quality and team experience.

What will set you apart 

• Direct experience in billing, payments, or API platform domains.
• Experience operating a "global core, configurable edge" or multi-market platform model (one engine, configuration at the edge, no client-specific forks of core logic).
• Experience mentoring senior engineers toward people-leadership roles.

Where you'll work
We offer flexible working, with an expectation of 3 days a week in the office. This gives us the best of both: real time together to collaborate and build relationships, with the flexibility to work in the way that suits you best the rest of the week.

Kaluza Values
Here at Kaluza we have five core values that guide us as a business: Play to win, Solve the real problem, Build trust every day, Own the outcome, Go further together.

Our Perks

• 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
• Progressive Leave Policy - With no qualifying service periods, including 26 weeks full pay if you have a new addition to your family
• Personal Learning Budget - Upskill, learn and grow!
• Home Office Budget
  And more!

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.