Software Engineer, Full Stack

About Thinking Machines

The mission of Thinking Machines is to build AI that extends human will and judgment. We are training frontier models with Inkling, developing Tinker to let people make models their own, and crafting interfaces that broaden human-AI communication. We believe the future worth building is human, and we're hiring people who want to build it.

About the Role

We’re looking for a full stack engineer to build and ship products from prototype to scale and to maintain tools that accelerate research and product teams. You’ll work across frontend and backend components, and contribute to reliability, observability, and security in production.

What You’ll Do

• Prototype and build new APIs and product backends in Python and Rust.

• Launch new products and UX with React and TypeScript where needed.

• Improve developer experience for local dev, deployment, testing, and iteration speed.

• Improve system reliability, observability, and security across production environments; participate in on‑call.

Skills and Qualifications

Minimum qualifications

• Bachelor’s degree or equivalent experience in computer science, engineering, or similar.

• Proficiency in at least one backend language (we use Python or Rust).

• Some familiarity with ReactJS, TypeScript or mobile platforms.

• Comfort operating across the stack and owning projects end-to-end.

• Thrive in a highly collaborative environment involving many, different cross-functional partners and subject matter experts.

• A bias for action with a mindset to take initiative to work across different stacks and different teams where you spot the opportunity to make sure something ships.

Preferred qualifications

• Experience designing and maintaining backend APIs at scale.

• Experience building tooling or products for LLMs or other systems that scale to a large number of users.

• Ability to build high‑quality, production-level UIs from prototype to polish.

• Familiarity with NodeJS, Python, and/or Rust.

• Experience building AI products or other products that scale to a large number of users.

Logistics

• Location: This role is based in San Francisco, California. 

• Compensation: Depending on background, skills and experience, the expected annual salary range for this position is $300,000 - $475,000 USD.

• Visa sponsorship: We sponsor visas. 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.

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