Skip to content
CV Rocket
Get started
How it worksThe enginePricingBlogContactSign in

Open nowPosted 23 days ago

Staff Engineer (Global Billing, Payments & API)

Kaluza38 open roles

Where
Bristol, England, United Kingdom; Edinburgh, Scotland, United Kingdom; London, England, United Kingdom
Get the CV for this job

From $25 per CV, paid once. No subscription.

Your applicationOpen nowStaff Engineer (Global Billing, Payments & API)Kaluza · Bristol, England, United Kingdom; Edinburgh, Scotland, United Kingdom; London, England, United Kingdom

  1. YouYes, apply to this one.

  2. CV RocketCV written for this posting.

  3. 25 readersRecruiter, hiring manager, skeptic. Round after round.

  4. CV RocketApplied on Kaluza's own form.

The reply lands in your private mailbox

3×more interviews than doing it yourself with ChatGPT.

The clock on this job

Early applications get read.

12.1% of postings close within 7 days. Measured by our own scanner across the market. Kaluza postings stay open a median of 1 days.

Share of postings closed within
  1. 2.1%1 day
  2. 4.5%3 days
  3. 12.1%7 days
  4. 19.1%14 days
  5. 35.6%30 days
  6. 52.7%60 days
This job: posted 23 days ago

Kaluza median: 1 days open

The posting

Location: London, Bristol or Edinburgh, UK (hybrid, three days a week in the office)

Level: Staff Engineer TL2

Team: Global Billing, Payments & API

Salary: £97,000 – £122,000 + discretionary bonus

Contract: Permanent

Reporting To: Senior Software Engineering Manager

Please note: This role requires an existing right to work in the UK. We can’t offer visa sponsorship, but we review sponsorship role by role, so keep an eye on our careers site for future opportunities.

About Kaluza

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, 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 you'll do

Kaluza runs the billing and payments engine behind some of the world's biggest energy retailers. This role builds and evolves the platform other engineering teams build on top of: the shared APIs, integration patterns, and technical standards that let billing and payments capability get built once and reused everywhere, instead of 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, having a consistent, well-designed API platform is what lets new capability get adopted quickly and safely across every team that needs it, rather than each team solving integration and standards problems on its own. Getting this right directly shapes how fast Kaluza can extend billing and payments capability to new markets and clients.

We're also in the middle of reorganising how this part of the business works, moving toward one shared global core that every market configures rather than rebuilds. This role's remit, API platform and standards, is one of the technical foundations that shift depends on. Responsibilities include:

  • You'll own system design and architecture for the API Platform and Standards squad, not just a single service.
  • You'll create and challenge product and engineering proposals, backing design trade-offs with data.
  • You'll diagnose and resolve complex technical and product issues, including in areas outside your immediate domain.
  • You'll establish architectural patterns and technical standards that other teams build on top of.
  • You'll take ambiguous, loosely-defined technical requirements and turn them into a concrete plan others can execute against.
  • You'll influence engineering leadership, product, and adjacent squads to bring clarity and alignment on technical direction.
  • You'll mentor and upskill engineers beyond your immediate team, contributing to a wider learning culture.

What you'll bring Ideally you’ll have:

  • Deep technical expertise applied to system design and architecture ownership across a squad, not just a single team or service.
  • Be able to create and challenge product and engineering proposals and make design trade-offs, backed by data.
  • A track record diagnosing and resolving complex technical and product issues, including in domains you aren't already close to.
  • Be skilled at establishing and driving adoption of architectural patterns and technical standards that other teams build on top of.
  • Be comfortable taking ambiguous, loosely-defined technical requirements and turning them into a concrete plan others can execute against.
  • Be accomplished at influencing both upwards and outwards, bringing clarity and alignment to engineering leadership, product, and adjacent squads on technical direction.
  • A track record mentoring and upskilling other engineers, and fostering a learning culture beyond your own immediate team.
  • Be comfortable operating in a high-integrity data domain (billing or payments), where reliability, security, and auditability come before speed.
  • Demonstrable customer obsession and a working-backwards practice: start from the problem other engineering teams or end customers have, and design the simplest platform capability that solves it.
  • A demonstrable record of applying AI/LLMs to deliver customer impact, not just adopting AI tooling internally.

What will set you apart

  • Direct experience with API gateway, versioning, or developer-experience standards work at scale.
  • Direct experience in billing, payments, or financial-services 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).

Our Values

Five values guide how we work at Kaluza:

  • Play to win: Collective pride in decarbonising energy at scale.
  • Solve the real problem: Cutting through complexity to focus on real-world outcomes.
  • Build trust every day: Consistency, transparency and doing what we say.
  • Own the outcome: Full accountability, wins and setbacks, without ego.
  • Go further together: Collaboration, respect and different perspectives.

Our Perks

  • Time off and family: 26 days’ holiday, plus 26 weeks’ full pay for new parents with no qualifying service period
  • Health and security: Private medical insurance with virtual GP, life assurance, pension scheme, free mortgage advice and eye tests
  • Pay and flexibility: Discretionary bonus, a Flex Fund of 5% [of salary] to spend on the benefits you want most, retail discounts through Perks at Work
  • Growth and setup: Personal learning budget, home office budget
  • Climate: Furthr, our climate action app

Come as you are

We want to meet people from all walks of life. The more inclusive we are, the better our work will be, and we recognise talent on merit and potential. If you’re excited about the role but don’t tick every box, we’d still love to hear from you.

Find out more on our careers page and LinkedIn. Our Applicant Data Protection Policy is here.

From $25, paid onceGet the CV for this job

What happens when you press

One press. We do the rest.

  1. A CV for this posting

    Written against Kaluza's own wording, from every piece of relevant proof in your profile.

  2. 25 readers review it

    Recruiter, hiring manager, skeptic and more read every draft, round after round. You get the best round.

    The review screen in CV Rocket: how each CV was read, round by round.

  3. We apply on Kaluza's form

    Our application engine gets through the hardest forms there are. Where a question needs you, AI suggests the best answer. Don't want us applying from our IP addresses? Use our Chrome extension: we apply straight from your own browser.

    An application in CV Rocket: every answer filled in on the employer's form.

  4. Every reply, sorted

    Kaluza's answer lands in your private mailbox, and we classify it on arrival: interview, question, rejection.

    The CV Rocket inbox: each employer reply classified as an interview, an action or a rejection.

  5. Reply with AI

    AI helps you write the email, checks it and sends it. We show you whether the recruiter read it.

  6. The interview in your calendar

    Full integration with your calendar. The invitation goes straight in.

    An interview invitation in the CV Rocket inbox, added to the candidate's calendar.
Get the CV for this job

From $25 per CV, paid once. No subscription.

Why it works

3×

more interviews than doing it yourself with ChatGPT.

ChatGPT writes a CV and never learns what happened to it. We see every reply. For each CV we know:

  • How it was written, and how the review scored it
  • When we applied, and how long after the posting went up
  • Which posting, which company, which city
  • Who got the interview, and who heard nothing

That is how we know which CVs get called.

Get the CV for this job

From $25 per CV, paid once. No subscription.

The numbers game

More applications. More interviews.

Every application goes out with its own CV, written for that posting and paid once. Send enough of them and the law of large numbers finds you the job.

Get the CV for this job
By hand5–10
With CV Rocket100
applications a day

Nearby

Live postings like this one

Same employer first, then the same role elsewhere.

Before you press

Straight answers

Get the CV for this job

From $25 per CV, paid once. No subscription.

What if my background isn't good enough?

We make the most of the background you have. The CV uses every piece of relevant proof your profile holds, and one of the 25 readers reads your whole profile and flags what the CV left out.

Do you really apply for me?

Yes, on the employer's own form, the hardest ones included. Where a question needs you, you answer it right there and AI suggests the best answer. Don't want us applying from our IP addresses? Use our Chrome extension: we apply straight from your own browser.

Is it a subscription?

No. You pay once per CV, from $25. Every application goes out with its own CV, written for that posting.

One job. One CV.
Paid once.

Pick the posting you want. We write for it, apply for you and catch the reply.

Get the CV for this job

From $25 per CV, paid once. No subscription.