# Staff Software Engineer

**Company:** [Idler](https://hotfix.jobs/companies/idler)
**Location:** San Francisco, CA
**Role:** Backend Engineering
**Salary:** $300k – $400k/yr
**Experience:** 8+ years
**Skills:** TypeScript, React, Node.js, Postgres, Redis, Vercel, Cursor, Reinforcement Learning, Rl Environments, Automated Qa Systems
**Posted:** 2025-11-13

> Designs and builds scalable agentic systems for generating and QA'ing reinforcement learning environments that teach AI models to code. Leads core technology primitives, owns full stack, and mentors juniors with 8+ years experience.

## Job Description

## Responsibilities

- Build agentic systems that create and QA coding environments at scale
- Design these systems to be extremely sound
- Think critically about what makes a coding environment and task \"good\" and \"fair\"
- 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

## Staff Engineer Responsibilities & Requirements

- Lead the process of identifying, specifying, and implementing core technology primitives that maximize the leverage of the rest of the team
- Understand and own the technology stack end-to-end
- Lead and mentor more junior members of the team

## Tech Stack

- TypeScript
- React
- NodeJS
- Postgres
- Redis
- Vercel
- Cursor

## Benefits

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

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**Apply:** https://hotfix.jobs/jobs/557078d4-13cf-4d98-b9f8-176442ea8d21
**Canonical:** https://hotfix.jobs/jobs/557078d4-13cf-4d98-b9f8-176442ea8d21