Senior Test Engineer, Thermal Control Systems

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 looking for a Senior Test Engineer, Thermal Control Systems, reporting to the Manager, Thermal Test Engineering, to support the development of the systems that will be required for the design and build of human-rated space stations.

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

Responsibilities:

Own and drive the full lifecycle of assigned thermal control system test campaigns of moderate complexity — from CONOP and test plan development through GSE design, build, instrumentation, execution, data analysis, and closeout — supporting near-term and long-term space habitat missions

Perform hands-on assembly, integration, instrumentation, and testing of thermal and fluid systems (tubing, heat exchangers, cold plates, pumps, valves, heaters, MLI), ensuring compliance with engineering specifications, safety protocols, and industry standards

Develop and maintain detailed test plans, procedures, work instructions, and manufacturing plans, and uphold rigorous test traceability across design, planning, execution, and post-processed data to ensure alignment with subsystem requirements and program milestones

Collaborate cross-functionally with thermal design, analysis, systems, integration, and manufacturing teams — and support suppliers — to inform manufacturability, assembly, and testability of thermal hardware and ensure timely delivery of quality components

Investigate and resolve complex technical issues through root cause analysis, coordinating with technicians, engineers, and suppliers to implement lasting corrective actions

Provide technical input in design and test reviews (PDR, CDR, TRR, etc.) and contribute to continuous improvement efforts that boost test efficiency, manufacturing yield, and data quality

Serve as a reliable technical contributor and informal mentor to junior engineers, while helping shape best practices and standardization within the test engineering team

Minimum Qualifications:

Bachelor's degree in Mechanical Engineering, Aerospace Engineering, Manufacturing Engineering, or a related engineering discipline, with 5+ years of experience across thermal systems, fluid systems, manufacturing engineering, and/or test engineering in aerospace or similarly demanding environments

Strong foundation in fluid systems — including fluid mechanics, system design, P&IDs, test instrumentation and fittings, safety protocols, and troubleshooting methodologies — along with hands-on experience testing and troubleshooting fluid, mechanical, and electromechanical components and performing root-cause analysis of failures

Demonstrated experience owning and executing test campaigns end-to-end, from objective definition and CONOP development through GSE design, build, instrumentation, test execution, and data analysis, including contributing to test automation and data review tools

Proficiency in CAD software (such as Siemens NX) for reviewing designs and creating manufacturing and test documentation, and a proven ability to contribute to cross-functional engineering initiatives and drive projects to on-time completion in fast-paced environments

Working knowledge of data acquisition systems, sensor selection, signal diagnostics, and data analysis techniques, with solid depth in a primary discipline and working knowledge across controls, electronics, wiring, and instrumentation

Preferred Skills & Experience:

Hands-on experience with supercritical fluid systems, high-pressure and LN2 test operations (including serving as test conductor), and thermal control hardware manufacturing/assembly processes (fluid tubing, heat exchangers, cold plates, MLI), with the ability to identify manufacturability risks

Working GD&T proficiency for reviewing engineering drawings and ensuring design intent translates correctly into manufactured hardware, plus experience with paints, coatings, adhesives, and contamination-sensitive processes in an aerospace environment

Familiarity with aerospace test standards and codes (e.g., SMC-S-016, ASME B31.3) and the aerospace test lifecycle (PDR, CDR, TRR, ATP, QTP), with the ability to interpret and apply requirements in real-world test environments

Advanced proficiency of data acquisition systems, sensor selection, signal diagnostics, and data analysis techniques, with solid depth in a primary discipline and working knowledge across controls, electronics, wiring, and instrumentation

Pay Range: California$137,760—$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 BENEFITSBase 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.

EQUAL OPPORTUNITYVast is an Equal Opportunity Employer; employment with Vast 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.