Gem.com

Simulation Researcher/Engineer

Gem.com$250K — $450K *
Consumer Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Strong background in robotics simulation or generative 3D
  • Degree or equivalent practical record in relevant field
  • Fluency in Python and C++
  • Familiarity with at least one production physics engine (e.g., Isaac Sim, MuJoCo, Bullet)
  • Proven experience building widely-used simulation systems

Responsibilities

  • Design visually rich and physically plausible simulation environments
  • Build evaluation harnesses to assess world model quality
  • Develop differentiable and GPU-accelerated simulation pipelines
  • Drive asset, scene, and task generation pipelines
  • Collaborate with upstream world-model and downstream policy-learning researchers

Benefits

  • Opportunity to work at the cutting edge of robotics and simulation
  • Access to advanced generative video and 3D models
  • Collaborative environment with cross-disciplinary teams
  • Potential to influence the design of simulation infrastructures
  • Contribute to impactful research published in top venues
Full Job Description
THE ROLE

We're building a sufficiently faithful, controllable simulation of the world - on top of Luma's generative video and 3D models - as the substrate for training general-purpose robot policies. As a Simulation Researcher/Engineer, you'll help define what that substrate looks like. You will sit at the boundary between generative models and classical physics simulation, and you'll be one of the people who decides where each one earns its keep.

WHAT YOU'LL DO

- Design simulation environments that are visually rich, physically plausible, and trainable at scale - a hybrid of generative rollouts and physics-engine-based scenes.

- Build the evaluation harness that tells us whether our world model is good enough to train robots on (sim-to-real gap, physical consistency, long-horizon coherence).

- Develop differentiable and GPU-accelerated simulation pipelines where they unlock new training signal.

- Drive the asset, scene, and task generation pipelines - including using Luma's own generative stack to bootstrap diversity.

- Collaborate with world-model researchers (upstream) and policy-learning researchers (downstream).

MINIMUM QUALIFICATIONS

- Strong background in robotics simulation, computer graphics, physics-based modeling, or generative 3D - degree or equivalent practical record.

- Fluency in Python and C++; deep familiarity with at least one production physics engine (Isaac Sim/Lab, MuJoCo, Bullet, PhysX, Drake).

- Track record of building simulation systems other people actually used.

PREFERRED

- Research on sim-to-real transfer, domain randomization, differentiable simulation, or neural-rendering-based simulation.

- Game engine, CGI, animation, or photogrammetry background.

- Publications at top venues (CoRL, RSS, ICRA, NeurIPS, SIGGRAPH).

Compensation

The base pay range for this role is $250,000 - $450,000 per year.

About Gem.com

Industry
Founded
2013

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