Security Engineer

Blocket AB; San Francisco (CA); Hybrid; USD 180,000 - 210,000; Full time

Benefits offered by this job

Health insurance

Vision insurance

Dental insurance

Unlimited PTO

Job summary

Blocket AB in San Francisco is seeking a Security Engineer focused on Linux infrastructure security to safeguard large-scale, untrusted workloads while maintaining low latency. You will design defense-in-depth for sandboxed and microVM systems, implement real-time threat detection, and ensure compliance with SOC 2, ISO 27001, and GDPR in a fast-growing startup.

This hybrid role requires 5+ years in production security, experience with container security and kernel-level controls; compensation is

Qualifications

• 5+ years of experience securing production infrastructure.
• Deep hands-on experience with Linux security primitives such as seccomp, eBPF, and namespaces
• Experience securing distributed systems at scale
• Familiarity with compliance frameworks including SOC 2, ISO 27001, and GDPR
• Comfortable working close to the system; kernel-level security experience is a plus

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

Job description

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

Why is This a Great Opportunity

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

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

• Fast paced startup experience (ideally,? seed-?Series B) working on a small team (
• 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.?

Job Requirements:

Qualifications

• 5+ years of experience securing production infrastructure
• Deep hands-on experience with Linux security primitives such as seccomp, eBPF, and namespaces
• Experience securing distributed systems at scale
• Familiarity with compliance frameworks including SOC 2, ISO 27001, and GDPR
• Comfortable working close to the system; kernel-level security experience is a plus