Product, Application and Offensive Security Lead

InfoSum is WPP’s privacy-first data collaboration technology, trusted by global businesses to unlock the full potential of their first-party data without risk. Its patented, cross-cloud, decentralized collaboration technology leverages advanced Privacy-Enhancing Technologies (PETs) to radically transform how companies generate audience intelligence and drive better customer experiences. As the foundational infrastructure underpinning WPP Open, InfoSum powers trusted data collaboration across every cloud, client, and capability. WPP is the trusted growth partner for the world’s leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company – powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. We work with the world's most valuable brands and have global reach across 100+ markets, with deep local expertise. Our people are the key to our success. We're committed to fostering a culture of creativity, belonging and continuous learning, attracting and developing the brightest talent, and providing exciting career opportunities that help our people grow. For more information, visit WPP.com. Department: Data & Technology Solutions (DTS) Reports To: SVP Security and Compliance Location: [London/Hybrid 2 days a week in office] Position Type: Full-Time Role Overview The Product, Application and Offensive Security Engineer is responsible for embedding security directly into the design, development, testing, and operation of DTS products and platforms. This is a hands-on security engineering role. The role requires someone who can work directly with product and engineering teams, review designs, assess APIs, run threat models, test systems, coordinate penetration testing, identify vulnerabilities, and help teams remediate issues. The role ensures DTS products, APIs, data collaboration capabilities, AI-enabled workflows, and client-facing services are designed, built, and tested securely. It also owns the practical offensive security and adversarial assurance activity needed to test DTS products from an attacker’s perspective. The Product, Application and Offensive Security Lead will work closely with Product, Engineering, Architecture, Infrastructure, Security Operations, Privacy, Cloud and Platform Security, and the ISMS and Risk Officer to ensure security issues are identified early, fixed effectively, and tracked through governance where required. Key Responsibilities 1. Hands-on Product and Application Security Provide hands-on security support across DTS products and engineering teams. This includes: Reviewing product designs, technical designs, APIs, services, and integrations. Identifying security weaknesses in applications, workflows, and data flows. Advising engineering teams on secure implementation. Supporting secure design decisions during product discovery and delivery. Helping teams resolve security issues pragmatically without creating unnecessary delivery friction. 2. Secure Software Development Lifecycle (SDLC) Embed security into the software development lifecycle across DTS. This includes: Defining and applying secure engineering standards. Supporting secure coding practices. Reviewing CI/CD security controls. Supporting SAST, DAST, SCA, secrets scanning, dependency scanning, and container scanning. Helping teams triage, prioritise, and remediate security findings. Working with engineering teams to make security checks practical and repeatable. 3. Threat Modelling and Security Design Reviews Run threat modelling and security design reviews for new and changed capabilities. This includes: Facilitating threat modelling sessions with engineering and product teams. Reviewing authentication and authorization designs. Assessing API exposure, data flows, trust bou