Software Engineer, Security

About this role

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.

SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.

SOFTWARE ENGINEER, SECURITY

You form hypotheses about why data is helping or misleading the model, build the systems to test them, run ablations, and read the rollouts to find the bug, shortcut or mismatch behind a result. Every flaw you catch, or miss, shows up in what the next Grok models learn.

RESPONSIBILITIES:

• Build AI augmented code review to get involved in important systems at the right time
• Build a least-privilege and JIT system for cloud access that enables engineers and enforces least privileges
• Implement a safe environment for agents to engage with code
• Implement a framework for securely handling agent manipulation of user systems (e.g., MCP tool calls and command execution)
• Implement a paved road for preventing inappropriate data from being logged

BASIC QUALIFICATIONS:

• Experience building or scaling secure systems in fast-moving environments

PREFERRED SKILLS AND EXPERIENCE:

• A strong software engineer first, with security as your superpower
• Think like both a builder and an attacker: you anticipate vulnerabilities before they become issues
• Care about developer experience, building solutions that are secure and frictionles...