Software Engineer
Idler · San Francisco, US
Checked against ashby — still accepting applications.
- Location
- San Francisco, US
- Type
- Full-time
- Posted
- 2025-10-14
- Applies via
- ashby
About idler
idler is a frontier data research lab. We build the evals and environments that the world's leading frontier labs use to measure and train their models.
We closed on a multimillion-dollar contract with a top lab and raised a $9m seed round led by Paradigm. We are now facing more lab demand for our data than we can currently serve.
Teaching AI superhuman capabilities is a responsibility we take very seriously. Our training data comes from work that is rigorous, ethically produced, and grounded in real expertise.
About the role
As a Software Engineer at idler, you’ll build the systems and infrastructure that our entire company relies on. You will solve open-ended, technical challenges with focus on performance, scale, and simplicity. In the era of AI-coding, systems-level thinking and attention to detail is more important than experience with a particular framework or language
Examples of what you'll do
- Design and build scaleable systems that generate RL environments
- Create agentic QA systems to validate environment quality and fairness
- Work directly with AI researchers at leading labs to understand what makes training data effective
- Handle petabyte scale ETL and orchestrate millions of concurrent jobs
- Support new product lines as we expand beyond coding environments
- Manage our security posture and compliance requirements
What we’re looking for
- 1-10 years of experience writing excellent production software (new grads OK)
- Experience with full-stack applications in a popular programming language
- A meticulous problem solver who creates robust systems under time pressure
Tech stack
Typescript, React, NodeJS, Postgres, Redis, Vercel, Cursor
Details
- In-person in San Francisco
- Competitive salary + meaningful equity
- Free meals in office
- Healthcare, 401(k), 15 days of PTO per year
- Relocation assistance
- Small, ambitious team
This is an in-person role in San Francisco. We're a tight-knit founding team and we play to win. Join us if you like to win too.
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