Location: Bristol or London

Level: AppSec Staff Engineer (TL2)

Team: Security Engineering, within the Cyber Security squad

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

You’ll join the Security Engineering team, working alongside our cyber security leadership, architecture team and technical leaders across engineering. Our mission is to equip teams to build and innovate while upholding security best practice and protecting client data in the highly regulated energy sector.

Integrate security tooling and use AI to prevent, detect and respond to emerging threats

Work with senior technical leadership to shape our technical strategy and solutions architecture, so security, risk and compliance feed into technical decisions

Help product teams deliver secure systems quickly by building a strong security culture through mentoring, design reviews and training

Give product and engineering teams practical guidance on identifying, prioritising and mitigating systemic risks and vulnerabilities

Lead the evolution of our security best practice across application development and the wider SDLC, supporting teams with expert advice and automation

Influence technical and non-technical stakeholders across Kaluza and client teams

Mentor and coach security and software engineers to balance risk with speed and quality

Build relationships with third-party security vendors and industry bodies to keep us at the forefront of emerging practices, tooling and standards

What you’ll bring

Ideally, you’ll have:

Extensive experience mentoring engineers and collaborating closely (e.g. pairing, swarming)

Deep understanding of software security flaws and web application security best practice (OWASP Top 10, CWE/SANS Top 25)

Extensive knowledge of CI/CD and DevOps principles, and their security considerations

Experience applying AI in your own work and helping others build it safely into how they develop

Scripting skills and first-hand experience of software development at scale

Working knowledge of Okta or equivalent, to enable workforce identity and enforce access management policies

Awareness of AWS and/or GCP security best practice, and some experience with infrastructure as code (e.g. Terraform)

Experience applying architectural and software design patterns in a complex environment

You’ll also be:

A pragmatic, risk-based decision-maker who weighs the technical and commercial consequences of your choices

Skilled at influencing upwards and outwards, with great communication skills

Able to set a clear vision for large-scale technical direction and align multiple teams behind it

Keen to drive compliance and NFR improvements that balance information security and commercial goals

Committed to a culture of learning and improvement, and willing to challenge engineering leadership to support it

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.