Marqeta Inc Senior Security Engineer at Marqeta leads incident response for North America and engineers AI-driven automated detection and response workflows. The role includes mentoring junior teammates and participating in a 24x7 on-call rotation.
Responsibilities
Serve as the lead security responder in North American timezones, triaging and investigating complex alerts
Participate in 24x7x365 on-call rotations providing senior-level expertise and escalation support
Engineer, maintain, and optimize detection logic across multiple data sources
Design detection coverage mapping to document capabilities and identify blind spots
Develop and track KPIs including detection effectiveness and mean time to detect, respond, and recover
Create and maintain incident response runbooks, SOPs, and technical documentation
Mentor junior team members in security operations best practices
Build automation workflows and orchestration playbooks
Develop and use AI-driven tools for Security Operations and Incident Response
Conduct proactive, hypothesis-driven threat hunts and support logging and monitoring infrastructure
Qualification
Typical Process
Required
5+ years of hands-on experience in security operations with emphasis on Incident Response and Detection Engineering. Additional expertise in threat hunting, cyber threat intelligence, and digital forensics is preferred.
Industry certifications in Incident Response or related fields are strongly preferred, such as GCIH, GCFA, GIME, OSIR, or GEIR.
Intellectual curiosity with a passion for understanding emerging threats, analyzing attack patterns, and continuously learning about evolving security landscapes and adversary tactics.
Strong investigative instincts that compel you to dig deeper into anomalies, follow evidence trails, and reconstruct complex security incidents from fragmented data.
Commitment to proactive learning and staying ahead of evolving threats by researching emerging attack techniques and sharing insights with the security team.
Solid technical foundation in security concepts and technologies, with hands-on experience using enterprise security tools including EDR, NDR, CSPM, EASM, SIEM, SOAR, and Cloud Security platforms such as GuardDuty.
Proficiency with threat intelligence frameworks such as MITRE ATT&CK and their application in assessing detection capabilities and coverage gaps.
Expertise in developing new threat detection use cases based on security telemetry analysis, environment baselining, actionable threat intelligence, and incident response findings.
Ability to identify detection coverage gaps across global infrastructure and collaborate with stakeholders to enhance visibility through improved logging and detection content.
Strong understanding of AWS cloud services and containerization technologies.
Preferred
Experience with programming languages such as Python, JavaScript, or Go
Experience with infrastructure as code tools such as Terraform.
Experience with forensic tools such as KAPE, EnCase, FTK, or Volatility.
Experience with Detections-as-Code infrastructure like Sigma, or YARA.
Experience conducting Purple Team exercises and writing reports.
Experience validating vulnerabilities or reported bugs.
Experience with Observability or SRE tools and processes.