RL Environments Engineer (AI)

Location: Mountain View, CA — onsite

Base salary: $250,000–$300,000 USD per year; 25% performance-based bonus and equity.

Company

hirify.global is an applied AI research lab focused on curating data and reinforcement learning environments for training and evaluating agents.

What you will do

• Build high-fidelity coding environments around real codebases, including their conventions, dependencies, tooling, and historical complexity.
• Design tasks across the full lifecycle: prompts, environments, graders, frontier-model execution, failure analysis, and iteration.
• Create deterministic, sandboxed grading and code-execution systems that are resistant to gaming.
• Run frontier coding agents against environments, evaluate their output, and identify silent failures.
• Develop internal tooling and automation that increases the team's environment-production capacity.
• Choose valuable environments targeting areas where frontier models measurably struggle.

Requirements

• Demonstrated experience shipping agentic coding tasks or environments at meaningful volume, with measurable output and production cost.
• Strong software engineering fundamentals and fluency in several programming languages.
• Production experience with large codebases, build systems, testing, deployment, on-call, and root cause analysis.
• An adversarial approach to graders and a clear understanding of how frontier coding agents behave and cut corners.
• Ability to build, debug, and ship independently with limited supervision.
• Availability to work onsite in Mountain View, California.

Nice to have

• Experience with RL training systems, post-training, verifiers, or tool-use harnesses.
• Background in developer tooling, CI/CD, sandboxes, or code-execution infrastructure.
• Experience with automated test generation, fuzzing harnesses, or benchmark suites.
• Contributions to public agentic benchmarks such as Terminal-Bench.
• Open-source work used by other people.

Culture & Benefits

• Health, dental, and vision coverage.
• 401(k) plan.
• Daily onsite lunch.
• Visa sponsorship and relocation support available.
• Direct impact on how the industry trains and evaluates agents.
• Additional compensation includes a performance-based bonus and equity.