Security Engineer

Security Engineer (Infrastructure / Linux)

Location: San Francisco, CA (Hybrid: 4 days onsite, 1 day WFH)
Compensation: $180,000 – $210,000 base
Employment: Full-time
Visa sponsorship: Not available

A well-funded client is seeking a senior Security Engineer to secure infrastructure that runs untrusted code at massive scale. This role is focused on Linux and infrastructure security, balancing strong isolation guarantees with high-performance requirements in a distributed environment.

Responsibilities

• Secure high-scale infrastructure executing untrusted workloads
• Design and implement defense-in-depth security for sandboxed and microVM-based systems
• Build real-time threat detection across large numbers of concurrent environments
• Apply Linux security primitives to enforce isolation and runtime protection
• Ensure compliance with enterprise security standards while maintaining low-latency performance

Tech Stack

• Go, Rust, C, TypeScript, Linux security, container hardening

• Cover full healthcare, vision, and dental insurance, and offer unlimited PTO.
• Series A startup with 7-figure revenue
• Small team, real impact 

Please highlight the must haves in the submittal. They have to have all the must haves to get an interview.  
Must have:

• Fast paced startup experience (ideally,? seed-?Series B) working on a small team (<?50 total)
• Proficiency in Go,? Rust,? or TypeScript.?
• Deep expertise in Linux security primitives (seccomp,? eBPF,? namespaces).?
• Willingness to work 4 days on-?site in San Francisco.?
• 5+ years of experience in production security infrastructure,? securing distributed systems at scale
• Experience securing distributed systems at massive scale.?
• Experience with container security and microVM hardening.?

Like to have

• Comfortable implementing kernel-?level security controls.?