Thinking Machines Lab

Software Engineer, Security

San Francisco

H1B sponsorship available$350k-$475kDetected 110 days ago

PythonRustExpressCloud PlatformsCI/CDMachine LearningPyTorchLLMsCybersecurityLogisticsResearch

About the role

We're looking for a software engineer focused on making our products secure by default while supporting fast and ambitious product iteration.
Note: This is an "evergreen role" that we keep open on an on-going basis to express interest.
We receive many applications, and there may not always be an immediate role that aligns perfectly with your experience and skills.

Partner with product and research teams to embed security into the development lifecycle: threat modeling, design reviews, and secure defaults for new features.
Design and implement security controls across our product stack (authentication, authorization, session management, input validation, etc.).
Build and maintain security tooling and automation for engineers: secure frameworks and templates, CI/CD checks, dependency management, and vulnerability detection.
Collaborate with researchers to identify and mitigate AI-specific product risks, such as model abuse, prompt injection, data leakage, or misuse of capabilities.

Bachelor's degree or equivalent experience in computer science, engineering, or similar.
Proficiency in at least one backend language (we use Python or Rust).
Strong generalist software engineering background and ability to review production code for security risks.
Familiarity with common vulnerability classes and prevention frameworks
experience hardening prototypes into production.
Comfort with modern cloud infrastructure and understanding how application concerns intersect with infrastructure.
Comfort operating across the stack and owning projects end-to-end.

we encourage you to apply if you meet some but not all of these:
Experience securing AI‑powered products or working with ML/LLM APIs and their unique threat models.
Background in human-computer interaction, especially where security or trust plays a central role in the user experience.
Strong skills in rapid prototyping and iteration, with a habit of turning ad-hoc fixes into reusable patterns and tools.
Open‑source security work, bug bounty write‑ups, or published tooling.

Thinking Machines Lab's mission is to empower humanity through advancing collaborative general intelligence.
access anomalies, abuse patterns, and suspicious behavior in production.
Skills and Qualifications

Depending on background, skills and experience, the expected annual salary range for this position is $350,000 - $475,000 USD.

Thinking Machines offers generous health, dental, and vision benefits, unlimited PTO, paid parental leave, and relocation support as needed.

While we can't guarantee success for every candidate or role, if you're the right fit, we're committed to working through the visa process together.
We sponsor visas.

This listing is sourced directly from Thinking Machines Lab's careers page and normalized into a canonical job model.