Senior Product Security Engineer

The role

You will own security design reviews and threat models for Lambda's systems. You will secure multi-tenant infrastructure, find and fix vulnerabilities in code, and build security tooling using Python or Go.

What you will do

• Own security design reviews and threat models
• Harden network, cluster, and infrastructure-service layers
• Review application code and infrastructure as code to find and fix vulnerabilities
• Run vulnerability management as a program
• Develop security patterns and requirements
• Partner with GRC on customer security reviews
• Build security tooling in Python or Go
• Partner across Product Engineering, Data Center Operations, and Detection & Response
• Coach engineers and mentor newer security team members
• Balance strategic and tactical work

Required qualifications

• 5+ years of demonstrated security engineering experience, or as a software, infrastructure, or site reliability engineer driving security outcomes
• Demonstrated depth in infrastructure security or application security
• Track record of independently owning security work end to end
• Ability to thrive in high-speed, high-ambiguity startup environments
• Strong hands-on Linux experience in both bare metal and cloud environments
• Ability to read application code and infrastructure as code fluently
• Ability to ship production-grade tooling in Python, Go, or a similar language
• Ability to translate security risk into business impact
• Excellent collaboration with technical teams

Nice to have

• Deep code analysis expertise, such as source code auditing, fuzzing, reverse engineering, or vulnerability research with published findings or CVEs
• Experience securing multi-tenant infrastructure: network segmentation, virtualization or container isolation, Kubernetes, or hardware root of trust and secure boot
• Led the security assessment and requirements for a major platform component or enterprise system
• Experience building infrastructure-as-code security guardrails
• Run vulnerability management as a program with risk-based prioritization and remediation SLAs
• Experience supporting enterprise customer security reviews or providing evidence for compliance audits such as SOC 2, ISO 27001, or FedRAMP
• Experience with AI/ML infrastructure security, model security, or protecting high-value computational workloads
• Significant experience operating large-scale production services or with virtualization at scale
• Enthusiasm about leveraging LLMs, frontier models, and AI tools for security

Benefits

• Generous cash & equity compensation
• Health, dental, and vision coverage for you and your dependents
• Wellness and commuter stipends for select roles
• 401k Plan with 2% company match (USA employees)
• Flexible paid time off plan

About the company

Lambda is a leader in AI cloud infrastructure serving tens of thousands of customers. Founded in 2012, it has 500+ employees and is growing fast.