AppSec Staff Engineer

Location: Bristol, UK (hybrid, three days a week in the office) Level: Staff Engineer (TL2) Team: Security Engineering, within the Cyber Security squad Salary: £105,600 – £132,000 + 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 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