Vast is developing next-generation space stations and space infrastructure using an incremental, hardware-rich, and capital-efficient approach. Vast is rapidly developing its multi-module Haven Station to support a continuous human presence in space for America and its allies, enabling advanced microgravity research and manufacturing, and supporting a growing space economy for government, corporate, and private customers. Haven Demo’s 2025 success made Vast the only operational commercial space station company to design, build, and operate its own spacecraft in orbit. Next, Haven-1 is targeted to become the world’s first commercial space station, with launch anticipated in 2027, followed by additional Haven modules. Additionally, the company recently announced two new offerings leveraging its space station components and the heritage of Haven Demo: Vast Satellite, a high-power satellite product line; and Vast Lunar Systems, power, communications, and habitats for the Moon.

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 capable of manufacturing America’s next space station. The company plans to develop future habitats and systems for Mars, dedicated modules for government partners, and other crewed systems designed to unlock the expanding long-term space economy.

Vast is seeking a Senior GNC Engineer to own guidance, navigation, and control for a new constellation-ready spacecraft bus — a product line designed to scale to hundreds of spacecraft per year.

The satellite bus uses a CMG-based attitude control system — four Vast Mini CMGs in a pyramid configuration. ADCS performance is a defining capability of the bus — it's what enables high-power payloads that demand precise pointing and rapid slew. You'll own the GNC algorithms, simulation environment, sensor suite definition, and pointing performance for the satellite.

This is end-to-end ADCS ownership: from architecture trades and algorithm development through 6DOF simulation, hardware-in-the-loop testing, and on-orbit commissioning. You'll engage directly with payload customers on pointing and stability requirements, and you'll define the CMG and sensor performance specs that drive hardware development and procurement across the program.

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

Responsibilities

Define the ADCS architecture — CMG pyramid configuration, sensor suite selection, pointing modes (nadir+yaw steer, LVLH fixed, 3-axis sun tracking)
Develop GNC algorithms — attitude determination, CMG steering law (including singularity avoidance), momentum management, desaturation strategy
Own the pointing budget — pointing accuracy, stability, jitter, and smear allocation across the sensor and actuator chain
Define the simulation strategy — determine how the spacecraft design, simulation, and digital twin tool and Vast’s flight-validated 6DOF physics sim (GTsim) work together, what fidelity is needed for upfront system design vs flight readiness
Build and validate the 6DOF simulation environment
Define CMG performance requirements — momentum capacity, gimbal rate, gimbal limits, pyramid angle — feeding the electronics lead for box design
Define sensor performance requirements — star tracker, IMU, sun sensor, magnetometer, GNSS receiver accuracy and noise specs (feeding the procurement lead for vendor selection)
Support CMG Rev 1 bring-up with closed-loop testing
Define and commission the HITL (hardware-in-the-loop) lab — flight processor, spoofed I/O, real-time simulation
Magnetic field modeling for torque rod sizing
Run Monte Carlo analysis campaigns to demonstrate pointing performance and flight readiness
Assess flexible body dynamics — structural mode coupling with large solar arrays and cantilevered payloads, define appendage first-mode frequency requirements for structures
Engage directly with payload customers on pointing and stability requirements — assess feasibility on the bus, define GNC data interfaces, and negotiate what we can support