Senior Software Engineer, Simulation

About the role

We are seeking a Senior Software Engineer to build the log replay and scenario execution systems at the core of our simulation platform. In this role, you will take a recorded log from storage, to a replayable test case, to a scored result, and own the execution, determinism, and reporting in between. You will do this across on-road and off-highway programs, and you will own the tooling other engineers use to run scenario suites.

What you’ll do

• Log replay. Build the pipeline that converts recorded logs into replayable test cases, including ingest, indexing, retrieval, and replay of a specific run on demand. Implement open-loop scoring against ground truth and closed-loop replay where the simulated machine is allowed to diverge.
• Scenario execution. Build the execution layer that runs a scenario identically every time, including clock control, seed and configuration management, and results traceable to a software version.
• Continuous integration. Integrate simulation into CI. Maintain the commit, nightly, and regression workflows, and keep failures attributable.
• Metrics and reporting. Implement the pass criteria and metrics a release is judged against, and the reporting that reduces a batch of failing runs to an actionable list.
• Scale and cost. Run large batches efficiently, track the cost of a simulation run, and reduce it as volume grows.
• Tooling. Build the interfaces, visualizations, and command-line tools that make the platform usable by engineers who did not build it.
• Cross-functional work. Work with autonomy and robotics on failure definitions, with bench and hardware-in-the-loop engineering on the path from simulation to bench to vehicle.

What we’re looking for

• Bachelor's degree in Computer Science, Robotics, Electrical Engineering, or a related field with 5+ years of software engineering experience, or a master's with 3+ years required.
• Proficiency in C++ and Python, including the ability to read, navigate, and debug large codebases.
• Experience building and operating data or test infrastructure at scale, including pipelines, batch execution, storage and indexing.
• Experience with simulation, log replay, or large-scale automated testing for robotics or autonomous vehicles.
• Working experience with a robotics middleware and its logging and replay tooling.
• Experience handling autonomous driving or robotics sensor data across multiple modalities and timestamps, including camera, LiDAR, and radar.
• Practical understanding of determinism and reproducibility, including clock control, seed management, and configuration pinning.
• Experience integrating test workloads into continuous integration.
• Working fluency with modern AI coding and agentic development tools.
• Clear written communication covering design notes and test results.
• Willingness to travel occasionally to deployment and test sites.
• Ability to work onsite five days a week in San Francisco.

What else you need to know

This role is based in our San Francisco office. Atoms is a company driven by invention and continuous change - we are constantly reimagining our industries, building new products, and refining how we operate. We do our best work together. That’s why all of our office-based teams work onsite, five days a week.

The base salary range for this role is $195,000 - $246,000 per year.

Base salary is just one part of your total rewards package. You may also be eligible for equity awards.

Benefits Summary (USA Full-Time Exempt Employees):

• Medical, Dental, Vision, Disability, and Life Insurance
• Flexible Spending Account / Health Savings Account Options
• 401(k)
• Equity
• Sick Time, Unlimited Flexible Time Off, and Paid Holidays
• Paid Parental Leave
• Pre-Tax Commuter Benefit Plan
• Team lunch in our SoMa office every Tuesday and Thursday

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