Staff Security Engineer - Detect & Response - EU/UK

The Staff Security Engineer will proactively monitor Marqeta's environment for cyber threat activity and manage day-to-day security alerts through timely analysis, triage, and appropriate response actions. They will serve as the incident commander during security events of all severity levels, directing investigation strategies and coordinating cross-functional response efforts. The role involves delivering NIST Incident Response Lifecycle aligned services to prepare for, detect, contain, eradicate, recover, and learn from cybersecurity incidents. They will work with the CISO to maintain the Cybersecurity Incident Response Plan (CIRP), ensuring alignment with government and law enforcement reporting requirements. Responsibilities include documenting and maintaining Security Operations processes, procedures, playbooks, and runbooks, and participating in 24x7x365 on-call rotations, providing expert-level guidance during security incidents and conducting thorough post-incident reviews. The engineer will proactively research threat intelligence sources to develop and lead hypothesis-driven threat hunting initiatives, work closely with Security Solution Engineering to tune security solutions and enhance detection capabilities, and serve as liaison with HR, law enforcement, response retainers, and cyber insurers as required. Additionally, they will mentor security team members in incident response methodologies while collaborating with senior leadership to communicate security risks and strategic recommendations.