Simulation Engineer (Robotics)

Location: San Carlos, California, United States; on-site

Salary: $200,000–$300,000 per year plus equity

Company

hirify.global builds humanoid robots designed to perform household tasks safely in real-world environments.

What you will do

• Build physically realistic simulation environments and infrastructure for the NEO humanoid robot.
• Improve contact dynamics, articulated-body models, actuator and transmission fidelity using system-identification data from real hardware.
• Model compliant and deformable bodies, as well as sensor noise, bias, dropout, latency, and sampling behavior.
• Establish benchmarks and real-robot comparisons to quantify sim-to-real error and guide fidelity improvements.
• Optimize physics and rendering pipelines while delivering diverse environments and synthetic-data pipelines for policy training and evaluation.
• Develop deterministic, reproducible, tested simulation code used by robotics research and development teams.

Requirements

• 5+ years of relevant industry experience, or an advanced degree with equivalent hands-on experience.
• Strong programming skills in Python, C++, or similar languages, with experience using robotics simulators such as MuJoCo, PyBullet, or Isaac Sim.
• Demonstrated experience improving simulation fidelity and closing the sim-to-real gap for behavior deployed on physical hardware.
• Experience modeling sensor behavior and failure modes, including noise, bias, latency, and dropout.
• Experience improving physics-simulation or rendering-pipeline performance.
• Strong testing practices for simulation stacks, including physical-correctness and regression testing.

Nice to have

• Experience with system identification on real hardware and converting measured parameters into simulation models.
• Experience with procedural environment generation or scalable simulation-data production.
• Familiarity with differentiable simulation, learned or neural simulators, or GPU-accelerated physics such as Warp or JAX-based frameworks.
• Background in legged locomotion, dexterous manipulation, or contact-rich and deformable-body simulation.

Culture & Benefits

• Medical, dental, and vision coverage.
• Paid time off, company holidays, and parental leave.
• 401(k) plan with company match, plus FSA and HSA options.
• Commuter benefits, disability and life insurance, and an Employee Assistance Program.
• On-site snacks and catered lunches.