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 Responsibilities

• Develop 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 requirements
  • Bulk fluid warming
  • Thermal management constraints
• Define 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 forecasts
  • Bleed duration estimates
  • Orifice sizing
  • Heat load calculations
• Build 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 schedule
  • Engineering risks and mitigation plans
  • Resource performance
  • Cost tracking (where applicable)

Qualifications
Required:

• 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 thermodynamics
  • Feedline chilldown
  • Heat exchangers
  • Pneumatic system cycles
• Understanding 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.

Deliverables

• Validated model files
• Model description documentation
• Detailed system-level analysis reports
• Ongoing technical reporting and engineering updates aligned to program needs

Our Diverse and Inclusive Culture
CareerPaths 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 holidays
• Matching 401(k) plan
• 100% employer-paid medical insurance premiums

CareerPaths NW is an equal opportunity employer committed to diversity, equity, and inclusion. We welcome applicants from all backgrounds and experiences.

If this sounds like a place youd like to grow your career, visit us at www.careerpathsnw.com/contract-jobs/