Software Engineer, Systems Simulation & Test

General Matter; Los Angeles (CA); On-site; USD 100,000 - 200,000; Full time

Benefits offered by this job

Stock options

Medical/Vision/Dental coverage

401(k) retirement plan

Job summary

General Matter in Los Angeles is seeking a Simulation Software Engineer to design high-fidelity simulators for our physical systems, hardware, and control software. You will define architecture, standards, and reliability for mission-critical simulation pipelines, collaborating with hardware, chemical, and electrical teams.

The role emphasizes on-site work at our LA headquarters, HIL/SIL testbeds, and building scalable infrastructure for validation and design verification, with an emphasis on

Qualifications

• Bachelor’s degree or higher in CS, EE, Mech Eng, Physics, or related field.
• 7+ years of experience building simulators for real-world systems.
• Strong programming in C++ and/or Python with large data handling.
• Deep understanding of distributed systems, control systems, or physical processes.
• Experience validating simulations with empirical data or hardware-in-the-loop.
• High standards for correctness, robustness, and engineering rigor.

Responsibilities

• Architect and own simulators for large, distributed systems with complex interactions, feedback loops, and failure modes.
• Model system dynamics and control behavior across nominal and off-nominal operating conditions.
• Build scalable infrastructure for high-volume simulation, scenario generation, and automated validation.
• Define correctness criteria and validate outputs against test and real-world data in partnership with systems and hardware teams.
• Support hardware-in-the-loop (HIL) and software-in-the-loop (SIL) testbeds that exercise control and system software against simulated plant behavior.

Skills

C++

Python

Distributed systems

Control systems

HIL/SIL experience

Education

Bachelor’s degree or higher

Tools

HIL/SIL testbeds

CI/CD

High-performance computing

Job description

Software Engineer, Systems Simulation & Test

About the Company

We are designing, building, and operating the world’s lowest-cost enrichment services, here in the US.

In the process, we are restoring America’s ability to produce nuclear fuel to power AI, advanced manufacturing and critical industries our country relies on to remain competitive.

Fuel drives the cost of advanced reactor electricity production, and enrichment drives the cost of the fuel that advanced reactors consume. Reliable, low-cost enrichment is the catalyst for the nuclear Renaissance now under way.

Our mission is to make nuclear not only the cleanest and safest source of baseload power, but also the most affordable. We believe abundant nuclear energy will lead to a post-scarcity society.

We were incubated inside Founders Fund, like Anduril and Palantir before us, and are backed by over a dozen of the world's top venture capital firms.

Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.

We are a mission-driven company with a culture of urgency, accountability, and transparency.

Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable.

Simulation Software Engineer

We are seeking a Simulation Software Engineer to design and build the high-fidelity simulators that model our physical systems, hardware, and control behavior. This role sits at the intersection of physical systems modeling and high-performance software engineering, and is responsible for building simulators that accurately reflect real-world behavior and accelerate testing, validation, and control system development in partnership with hardware, chemical, and electrical engineering teams. The successful candidate will play a central role in defining the architecture, implementation standards, and operational reliability of mission-critical simulation systems.

Responsibilities

• Architect and own simulators for large, distributed systems with complex interactions, feedback loops, and failure modes.
• Model system dynamics and control behavior across nominal and off-nominal operating conditions.
• Build scalable infrastructure for high-volume simulation, scenario generation, and automated validation.
• Define correctness criteria and validates simulation outputs against test and real-world data in partnership with systems and hardware teams.
• Support hardware-in-the-loop (HIL) and software-in-the-loop (SIL) testbeds that exercise control and system software against simulated plant behavior.

Basic Qualifications

• Bachelor’s degree or higher in Computer Science, Electrical Engineering, Mechanical Engineering, Physics, or a related field.
• 7+ years of experience building simulators for complex, real-world systems.
• Strong programming skills in C++ and/or Python with experience handling large data flows.
• Deep understanding of modeling distributed systems, control systems, or physical processes.
• Experience validates simulations against empirical data or hardware-in-the-loop setups.
• High standards for correctness, robustness, and engineering rigor.

Preferred Skills and Experience

• Experience simulating industrial, aerospace, energy, or similarly complex systems (e.g., chemical plants, rockets, power grids).
• Background in control theory, numerical methods, or systems modeling.
• Experience running large-scale simulations for design validation or fault analysis.
• Familiarity with performance optimization and parallel or distributed simulation.
• Familiarity with automated test frameworks and continuous integration for simulation and test workflows.
• Hands‑on experience with HIL/SIL testbeds, including working knowledge of the underlying physical systems, instrumentation, and hardware interfaces they exercise.
• Experience operating in high‑stakes, safety‑critical engineering environments.
• Demonstrated technical leadership in setting engineering standards and building and mentoring high‑performance engineering teams.

Additional Requirements

• Ability to work extended hours and weekends as necessary.
• Ability to come into our office every day. This role is 100% on site.

Equal Opportunity Employer

General Matter is an Equal Opportunity Employer; employment with General Matter is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

Compensation and Benefits

The base salary range for this role is $100,000–$200,000 annually.

Compensation bands are determined by role, level, location, and alignment with market data. Individual level and base pay is determined on a case‑by‑case basis and may vary based on job‑related skills, education, experience, technical capabilities and internal equity. Please note that the stated salary range is an estimate and may be adjusted based on market conditions, business needs, or other factors. In addition to base salary, for full‑time hires, you may also be eligible for long‑term incentives, in the form of stock options, and access to medical, vision & dental coverage as well as access to a 401(k) retirement plan.

This role is based out of our headquarters in the south bay area of Los Angeles.

This position requires eligibility to obtain and maintain a U.S. Q security clearance. This includes, but is not limited to, the following requirements:

• Successful completion of an extensive background investigation
• Drug testing
• Security interview
• Favorable adjudication of trustworthiness and reliability

For more information about U.S. Security Clearances: click here .