Senior Security Engineer — Own End-to-End Trust & Vault Security

Blue; Santa Clara (CA); On-site; USD 180,000 - 240,000; Full time

Job summary

Blue is seeking a senior security engineer to ensure the Blue OS and its services remain secure across all boundaries. You will guard user data, manage vault access, and own identity and accounts while mentoring junior engineers.

You will assess threats, establish a security bar for engineers, and review changes to authentication, permissions and data access. Collaboration with cross‑functional teams is essential.

Qualifications

• Proven experience delivering end-to-end security for a consumer product.
• Understanding of security risks associated with LLM agents and prompt injection.
• Ability to clearly communicate risk and drive changes.
• Mentored junior engineers in security practices.
• Comfort working with ambiguity and moving quickly without compromising quality.

Responsibilities

• Ensure Blue is secure in every aspect and block changes that weaken security.
• Own identity, login, accounts, and authentication workflows.
• Oversee security across OS, apps, servers, vault and the assistant.
• Develop threat models for new features and maintain security hygiene for dependencies and secrets.
• Provide reviews on vault access, authentication and app permissions.
• Mentor early‑career engineers to identify and fix security issues.

Skills

Security engineering

Threat modeling

Mentoring

Explain risk

AI/LLM security

Ambiguity tolerance

Tools

AWS

Android security

Job description

Blue is seeking a senior security engineer to ensure the Blue OS and its services remain secure across all boundaries. You will guard user data, manage vault access, and own identity and accounts while mentoring junior engineers.

You will assess threats, establish a security bar for engineers, and review changes to authentication, permissions and data access. Collaboration with cross‑functional teams is essential.