Senior Security Architect (Product Security) in London

At Anaplan, we are a team of innovators focused on optimizing business decision-making through our leading AI-infused scenario planning and analysis platform so our customers can outpace their competition and the market. What unites Anaplanners across teams and geographies is our collective commitment to our customers’ success and to our Winning Culture. Our customers rank among the who’s who in the Fortune 50. Coca-Cola, LinkedIn, Adobe, LVMH and Bayer are just a few of the 2,400+ global companies who rely on our best-in-class platform.

Our Winning Culture is the engine that drives our teams of innovators. We champion diversity of thought and ideas, we behave like leaders regardless of title, we are committed to achieving ambitious goals, and we love celebrating our wins – big and small. Supported by operating principles of being strategy-led, values-based and disciplined in execution, you’ll be inspired, connected, developed and rewarded here. Everything that makes you unique is welcome; join us and let’s build what’s next - together!

Role Summary

This role owns the architecture itself: the reference designs engineering builds against, the review of the hardest problems, and the work of making secure-by-design real across the Hyperblock and Polaris platform and the AI product surface. As the most senior technical individual contributor in the security architecture practice, you set the technical bar the practice codifies into standards. The value of this role is not in producing documents that describe good architecture; it is in producing architecture that engineers adopt because it is genuinely the better path. You will work hands-on, on the problems that carry the most risk. Anaplan is not a simple SaaS application. The platform performs highly dimensional, enterprise-scale modelling with responsive recalculation and strong correctness expectations. The technical surface area includes the legacy Hyperblock engine, the newer Polaris engine, and a growing set of AI-powered products, including CoModeler for AI-assisted model building and CoPlanner for conversational, analyst-style planning support. AI-assisted capabilities such as CoModeler and CoPlanner are reshaping how the platform behaves, which means identity, authorisation, supply-chain integrity, and verification all need designing rather than reusing. The hardest security design problems land here, with real room to set the patterns. Security architecture has high leverage because it sits close to engineering and platform decisions.

Your Impact:

• Define reference architectures: own the security reference designs for the platform and the AI products, and keep them current as both evolve.
• Own identity and authorisation architecture: including authorisation for AI agents and analyst-style workflows, where assumptions about who is acting no longer hold.
• Set cryptography architecture: encryption and key-management standards, with a clear position on what is mandatory versus contextual.
• Design AI guardrails: input and output controls, tool and authorisation boundaries, and abuse and prompt-injection defences, informed by references such as MITRE ATLAS and the OWASP LLM Top 10.
• Lead threat modelling on the riskiest systems: and turn the findings into concrete design changes.
• Drive secure-by-design into the supply chain and attack surface: including build integrity and provenance, hardened images, and reduction of exposed surface.
• Set the technical bar the practice codifies: establish the standard that becomes adopted, enforceable guidance across the team.
• Stay hands-on: write and review real designs and prototypes, and pressure-test your own architecture rather than only specifying it.

Your Qualifications:

• Deep, demonstrable architecture mastery: secure software architecture, cryptography, identity and authorisation, and threat modelling at scale.
• Real AI and ML security depth, not vocabulary: a working grasp of how LLM-driven features change identity, authorisation, supply chain, and verification.
• Hands-on technical authority: you still design and review real systems and can defend your choices to strong engineers.
• The ability to influence senior engineers without formal authority, especially when risk and delivery pressure are in tension.
• Enterprise-scale, SaaS or cloud-first experience where architecture decisions carried real consequences.

Nice to have

• Published research, talks, or contributions to standards such as NIST, ISO, or OWASP.
• Experience designing for enterprise and regulated environments.
• An offensive grounding, formal or informal, that you use to pressure-test your own designs.

Our Commitment to Diversity, Equity, Inclusion and Belonging (DEIB)

We believe attracting and retaining the best talent and fostering an inclusive culture strengthens our business. DEIB improves our workforce, enhances trust with our partners and customers, and drives business success. Build your career in a place where diversity, equity, inclusion and belonging aren’t just words on paper – this is what drives our innovation, it’s how we connect, and it contributes to what makes us a market leader. We believe in a hiring and working environment where all people are respected and valued, regardless of gender identity or expression, sexual orientation, religion, ethnicity, age, neurodiversity, disability status, citizenship, or any other aspect which makes people unique. We hire you for who you are, and we want you to bring your authentic self to work every day!

We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, perform essential job functions, and receive equitable benefits and all privileges of employment. Please contact us to request accommodation.