Senior Product Security Engineer Financial Services | 6-month Contract | Inside IR35 London - 2 days onsite per weekMy client, a leading Payments company is looking for a Senior Product Security Engineer to join their evolving cyber security function. This is a key role focused on embedding security across the full product life cycle and driving secure-by-design principles across engineering teams.The RoleAs a Senior Product Security Engineer, you will act as the primary security partner for product and engineering teams - ensuring applications are designed, built and maintained with robust security at their core. You will lead threat modelling, manage vulnerability backlogs, support incident response, and help uplift security maturity across development squads.Key ResponsibilitiesDefine and implement product security policies, tooling and standards across the SDLCLead threat modelling for new and existing applicationsOwn the product vulnerability backlog, prioritising and tracking remediationLiaise on bug bounty findings and ensure timely fixesConduct root cause analysis for security incidents and systemic issuesAct as Incident Commander or Investigation Lead during security eventsPartner with CI/CD teams to integrate SAST, DAST, SCA and other security controlsCollaborate with product, engineering and compliance stakeholders to deliver security initiativesWhat You''ll BringStrong expertise in vulnerability management, threat modelling and secure SDLCSolid incident response a