Security Engineer: Build Trustworthy, Secure AI Platforms

Sierra; California (MO); On-site; USD 140,000 - 210,000; Full time

Benefits offered by this job

Flexible (unlimited) paid time off

Medical, dental, and vision benefits

Life insurance and disability benefits

Retirement plan dependent on country

Parental leave

Fertility and family building benefits

Lunch and snacks

Discretionary benefit stipend

Free alphorn lessons

Job summary

Sierra is seeking a Security Engineer to help build the foundations that keep our AI platform secure by default. You’ll design and ship systems across product security, infrastructure security, identity, and detection, partnering with product and platform teams to reduce risk and protect customer data.

You’ll own cross-cutting security initiatives, model designs, review architectures, and automate security workflows in CI/CD, enabling scalable defenses while balancing usability and performance.

Qualifications

• Deep Security Expertise in at least one domain (product, platform, cloud, identity, or detection & response).
• Ability to design secure, scalable systems and trade-offs between usability, performance, and security.
• Experience reading/writing code and contributing to APIs, services, and security controls.

Responsibilities

• Design and ship systems that make Sierra secure by default across product security, infrastructure security, enterprise security, identity, and detection & response.
• Threat model designs, review architectures, and evolve security primitives in collaboration with product/platform/infra teams.
• Identify vulnerabilities, investigate suspicious activity, and implement systemic fixes and controls to prevent issues.
• Create developer-friendly tooling to automate security checks in CI/CD and improve vulnerability discovery and response workflows.

Skills

Security fundamentals

Product mindset

Software engineering

Ownership & curiosity

Job description

Sierra is seeking a Security Engineer to help build the foundations that keep our AI platform secure by default. You’ll design and ship systems across product security, infrastructure security, identity, and detection, partnering with product and platform teams to reduce risk and protect customer data.

You’ll own cross-cutting security initiatives, model designs, review architectures, and automate security workflows in CI/CD, enabling scalable defenses while balancing usability and performance.