# Senior Software Engineer

**Company:** [Idler](https://hotfix.jobs/companies/idler)
**Location:** San Francisco, CA
**Role:** ML Engineering
**Salary:** $180k – $280k/yr
**Skills:** TypeScript, React, Node.js, Postgres, Redis, Vercel, Cursor, Reinforcement Learning, Rl Environments, Ai Systems
**Posted:** 2025-10-22

> Designs and builds scalable agentic systems for generating and QA'ing reinforcement learning environments that teach AI models to code. Collaborates with AI researchers using TypeScript, React, NodeJS stack in a tight-knit founding team.

## Job Description

## Responsibilities
- Design and build scalable 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

## Requirements
- Build agentic systems that create and QA coding environments at scale
- High agency and philosophical thinking alongside technical execution

## Tech Stack
- TypeScript
- React
- NodeJS
- Postgres
- Redis
- Vercel
- Cursor

## Benefits
- Healthcare coverage
- 401(k)
- 15 days PTO
- Meals, coffee, and snacks during working days
- Latest MacBook Pro and equipment
- Relocation assistance
- Team offsites and events

## Similar roles

- [Senior Software Engineer, AI](https://hotfix.jobs/jobs/b5ff4a30-137e-4cb9-93aa-59afeae0fa12) - Ironclad - San Francisco, CA - $180k – $220k/yr
- [Senior Software Engineer (AI)](https://hotfix.jobs/jobs/b2089819-c5b7-41e6-91e1-ad192b2d58ac) - Onos Health - San Francisco, CA - $180k – $240k/yr
- [Senior Machine Learning Engineer](https://hotfix.jobs/jobs/4713b492-d636-407a-bb9b-2a7357fb074a) - Teleskope - New York, NY - $180k – $210k/yr
- [Senior Machine Learning Engineer](https://hotfix.jobs/jobs/cc221086-96c9-44b8-9848-3fc8a12e202b) - Arcade - San Francisco, CA - $180k – $300k/yr
- [Senior Software Engineer, Personalization](https://hotfix.jobs/jobs/915a0781-f16b-4ca2-9381-d5483d637e67) - Posh - New York, NY - $180k – $220k/yr

**Apply:** https://hotfix.jobs/jobs/f3776300-c379-487e-b2a4-429e5c46e585
**Canonical:** https://hotfix.jobs/jobs/f3776300-c379-487e-b2a4-429e5c46e585