Fluid Analysis Engineer (Thermal & Pneumatics Modeling)

About the job Fluid Analysis Engineer (Thermal & Pneumatics Modeling) CareerPaths NW is seeking a highly skilled Fluid Analysis Engineer to provide advanced modeling and simulation support for complex aerospace fluid systems. In this role, you will develop, modify, and execute fluid, thermal, and pneumatic models to evaluate system performance across multiple vehicle subsystems. Ideal candidates bring deep technical experience, a high level of autonomy, and a strong background with industry-standard modeling tools such as SINDA/FLUINT and Thermal Desktop.This role will directly influence critical design, performance validation, and build-readiness milestones.Key ResponsibilitiesDevelop and execute thermodynamic and pneumatic system models in SINDA/FLUINT to support operational and mission-driven use cases.Run fill and drain analyses based on existing system data to support ground operations and vehicle readiness.Perform gas distribution modeling, including high-to-low pressure regulation, pressure control dynamics, and thruster cycle count analysis.Conduct pneumatic system evaluations to forecast cycle counts, pressure reduction performance, and system durability across mission timelines.Adapt existing tank thermodynamics models to updated vehicle geometries and mission sequences, including:Pressurization requirementsBulk fluid warmingThermal management constraintsDefine venting and reconditioning system size requirements based on model outputs and thermal performance predictions.Port, validate, and optimize feedline chilldown models for new feedline configurations including:Chilldown mass forecastsBleed duration estimatesOrifice sizingHeat load calculationsBuild thermal models for fluid panels, instrumentation, tank penetrations, and other subsystem elements using Thermal Desktop.Perform tank boiloff evaluations and generate recommendations related to fluid retention and risk mitigation.Conduct vent actuator latency analyses and provide engineering recommendations on valve/actuator sizing and control logic.Execute heat exchanger modeling, characterize subsystem heat transfer performance, and analyze efficiency.Produce clear deliverables, including modeling files, model description reports, and system-level analysis reports.Provide recurring technical updates summarizing:Progress against scheduleEngineering risks and mitigation plansResource performanceCost tracking (where applicable)QualificationsRequired:5+ years of professional experience in fluid system analysis, thermal modeling, or pneumatic systems engineering.Hands-on expertise with SINDA/FLUINT, Thermal Desktop, or comparable first-principles modeling tools.Demonstrated experience modeling:Tank thermodynamicsFeedline chilldownHeat exchangersPneumatic system cyclesUnderstanding of fluid heat transfer, pressure regulation, boiloff dynamics, and cryogenic or propellant systems.Ability to translate engineering results into clear technical documentation and reports.Strong communication and cross-functional collaboration skills.Preferred:Experience with aerospace vehicle subsystems, cryogenic fluids, propulsion systems, or thermal/pneumatic architectures.Prior work developing analytical models for flight programs, launch hardware, or space vehicle components.Experience preparing deliverables for engineering reviews or major design milestones.DeliverablesValidated model filesModel description documentationDetailed system-level analysis reportsOngoing technical reporting and engineering updates aligned to program needsOur Diverse and Inclusive CultureCareerPaths NW is a Seattle-based, minority-owned staffing and recruiting firm proudly serving clients and candidates for more than 17 years. Were passionate about connecting great people with meaningful opportunities and fostering a workplace built on trust, collaboration, and respect.We value integrity, transparency, and genuine partnership, and we believe diverse perspectives make us stronger.Benefits include:Up to three weeks of paid time off (PTO)Eleven paid holidaysMatching 401(k) plan100% employer-paid medical insurance premiumsCareerPaths NW is an equal opportunity employer committed to diversity, equity, and inclusion. We welcome applicants from all backgrounds and experiences.