Systems Engineer, Spacecraft Design & Simulation

Vast is developing next-generation space stations and space infrastructure using an incremental, hardware-rich, and low-cost approach. Vast is rapidly developing its multi-module Haven Station to ensure a continuous human presence in space for America and its allies, enabling advanced microgravity research and manufacturing, and unlocking a new space economy for government, corporate, and private customers. Haven Demo’s 2025 success made Vast the only operational commercial space station company to fly and operate its own spacecraft. Next, Haven-1 is expected to become the world’s first commercial space station when it launches in 2027, followed by additional Haven modules. Additionally, the company recently announced Vast Satellite , a high-power satellite product line leveraging its space station components and the heritage of Haven Demo.

Headquartered in Long Beach, California , and with more than 1,000 employees and over a billion dollars in private capital, Vast has built the facilities required to manufacture and operate America’s next space station. The company plans to develop future habitats and systems for the Moon and Mars, dedicated space stations for government partners, and other crewed systems that will unlock the expanding long-term space economy.

Vast is seeking a Systems Engineer, Spacecraft Design & Simulation to own the spacecraft simulation toolchain that is the foundation of our mission factory — the software infrastructure that will enable us to scale from our first 10-satellite demo launch to hundreds of spacecraft per year.

This will be a full-time , exempt position located in our Long Beach location.

About the role:

We're building a mission factory — software infrastructure that dramatically reduces the time from customer contract to payload on orbit. The foundation is a simulation and digital twin toolchain that serves as the primary engineering record. Requirements, budgets, design parameters, and trade study results all live in this toolchain. It includes spacecraft power/thermal/ADCS simulation, orbital constellation analysis, communications link budgets, and actuator trade studies. This is model-based systems engineering as it should work — requirements, budgets, and design parameters live in executable models that compute and validate, not in static documents. A working prototype exists today — you'll evaluate it, determine whether to extend it or redesign it, and own the toolchain as we scale from our first 10-satellite demo launch to hundreds of spacecraft per year.

This is a spacecraft systems engineering role, not a software engineering role. You define the governing equations, boundary conditions, and expected behavior for each model. You build and maintain a rigorous validation suite — hand calculations, independent tool cross-checks, and edge case analysis — that serves as the quality gate for every change. We use AI code generation tools to accelerate implementation, but the engineering judgment, validation methodology, and physics expertise are yours.

Responsibilities:

Own and evolve the spacecraft design, simulation, and digital twin toolchain — power, thermal, ADCS, orbital mechanics, constellation coverage, link budgets, mass and design margin tracking

Make the toolchain the hub of the engineering organization — every discipline (thermal, GNC, power, structures) should be able to run trade studies and assess design changes quickly as the program evolves

Drive design trades and architecture decisions through analysis — your models are how the team knows whether the power budget closes, whether the thermal architecture works, and whether we meet customer requirements

Enable rapid iteration as customer requirements and the design evolve — the toolchain must keep pace with the program so engineers can assess impact immediately, not wait weeks for analysis

Maintain the digital twin as the program's engineering record — requirements, budgets, design parameters, and trade study results live here

Build and maintain a rigorous validation suite — hand calculations, independent tool cross-checks, edge case analysis, and regression testing for every physics model

Train and support the engineering team so they can self-serve on trade studies and analysis

Minimum Qualifications:

Bachelor's degree in Aerospace Engineering, Mechanical Engineering, Electrical Engineering, Physics, or a related technical discipline

4+ years of spacecraft systems engineering or mission analysis experience

Spacecraft systems engineer with broad subsystem knowledge — you understand power, thermal, ADCS, and orbital mechanics well enough to catch errors in a simulation

Strong analytical skills — you can set up a hand calculation for a thermal equilibrium problem, a power budget across an orbit, or a pointing error budget

Rigorous validation mindset — you're the person who asks “how do we know this is right?” and builds the test to prove it

Comfortable with AI-assisted development workflows

Generalist background — prior experience at a small-sat company, research lab, or mission design role where you touched multiple subsystems

Cross-functional collaboration skills — you'll work with every discipline lead to capture their domain knowledge and translate it into validated models

Comfortable reading and reviewing code — you don't need a software engineering background, but you should be able to understand what code is doing and catch errors

Preferred Skills & Experience:

Able to obtain a security clearance

Experience building or maintaining spacecraft simulation tools

Familiarity with orbital mechanics (Kepler solver, J2 perturbations, eclipse geometry)

Familiarity with CMG dynamics, quaternion attitude propagation

Experience with data visualization tools or libraries

Demonstrated use of AI-assisted code generation tools on an engineering project — show us what you built

Requirements management and verification experience on a spacecraft mission

Experience with MBSE tools or model-based development methodologies

Experience scaling engineering tools or analysis workflows across a growing team

Experience developing validation and verification test suites for engineering tools

Pay Range:

Systems Engineer II: $112,340 - $159,468

Senior Systems Engineer: $137,760 - $195,552

Pay Range: California

$112,340 — $195,552 USD

We calibrate level and compensation to the selected candidate's experience and demonstrated capability. We welcome applicants across a range of experience levels to apply.

COMPENSATION AND BENEFITS

Base salary will vary depending on job-related knowledge, education, skills, experience, business needs, and market demand. Salary is just one component of our comprehensive compensation package. Full-time employees also receive company equity, as well as access to a full suite of compelling benefits and perks, including: medical, dental, and vision coverage for employees and dependents, generous paid time off; up to 20+ days of vacation for exempt staff and up to 10+ days of vacation for non-exempt staff with the ability to cash-out unused vacation annually, paid parental leave, short and long-term disability insurance, life insurance, access to a 401(k) retirement plan, ClassPass credits, personalized mental healthcare through Spring Health, and other discounts and perks. We also take pride in offering exceptional food perks, with snacks, drip coffee & onsite barista, cold drinks, and dinner meals remaining free of charge, and lunch subsidized as part of Vast’s ongoing commitment to providing high-quality meals for employees.

U.S. EXPORT CONTROL COMPLIANCE STATUS

The person hired will have access to information and items subject to U.S. export controls, and therefore, must either be a “U.S. person” as defined by 22 C.F.R. § 120.62 or otherwise eligible for deemed export licensing. This status includes U.S. citizens, U.S. nationa