idler
idler6mo ago
New
$180K – $280K • 0.15% – 1%/yr

Senior Software Engineer

San Franciscofull-timesenior
Software EngineerSoftware Engineering
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Quick Summary

Overview

What we do Idler builds reinforcement learning environments that teach AI models to code like 0.01% engineers. Our training environments are based on real-world coding scenarios that frontier models will actually encounter.

Key Responsibilities

Build agentic systems that create and QA coding environments at scale. Most of your day will be spent designing these systems to be extremely sound.

Technical Tools
postgresqlreactredistypescriptvercel

Idler builds reinforcement learning environments that teach AI models to code like 0.01% engineers. Our training environments are based on real-world coding scenarios that frontier models will actually encounter.

We've closed a multimillion-dollar contract with a leading foundation lab (the largest they've issued to date). Demand is outpacing our capacity to deliver, so we're scaling the team fast.

Responsibilities

~1 min read

Build agentic systems that create and QA coding environments at scale. Most of your day will be spent designing these systems to be extremely sound. A big part of our work is thinking critically about what makes a coding environment and task "good" and "fair". This requires high agency and philosophical thinking alongside technical execution.

Concretely, you'll:

  • Design and build scaleable systems that generate RL environments

  • Create automated QA systems to validate environment quality and fairness

  • Work directly with AI researchers at leading labs to understand what makes training data effective

  • Support new product lines as we expand beyond coding environments

The founding team, a founding engineer, and a small group of engineers (we're hiring quickly). You'll have direct access to AI researchers at frontier labs.

Typescript, React, NodeJS, Postgres, Redis, Vercel, Cursor

What We Offer

~1 min read
Healthcare coverage, 401(k), and 15 days PTO.
Meals, coffee, and snacks (that you will actually enjoy) covered during working days.
Latest MacBook Pro and equipment.
Relocation assistance available.
Team offsites and events (we love hanging out).

Location & Eligibility

Where is the job
San Francisco
On-site at the office
Who can apply
Same as job location

Listing Details

Posted
October 22, 2025
First seen
May 6, 2026
Last seen
May 8, 2026

Posting Health

Days active
0
Repost count
0
Trust Level
23%
Scored at
May 6, 2026

Signal breakdown

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idlerSenior Software Engineer$180K – $280K • 0.15% – 1%