Cesiumastro
Cesiumastro7mo ago
USD 126000–168500/yr

Senior Mechanical Engineer I

United StatesUnited States·El SegundoFull-timesenior
EngineeringMechanical EngineerTrades & Skilled Labor
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Quick Summary

Overview

Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident,

Technical Tools
EngineeringMechanical EngineerTrades & Skilled Labor
Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.

At CesiumAstro, we are developers and pioneers of out-of-the-box communication systems for satellites, UAVs, launch vehicles, and other space and airborne platforms. We take pride in our dynamic and cross-functional work environment, which allows us to learn, develop, and engage across our organization. If you are looking for hands-on, interactive, and autonomous work, CesiumAstro is the place for you. We are actively seeking passionate, collaborative, energetic, and forward-thinking individuals to join our team.

We are looking to add a Senior Mechanical Engineer I to our team. If you enjoy working in a startup environment and have experience in the design of the valves for different pneumo-hydraulic systems, we would like to hear from you.
 
In this role, you will be responsible for driving design decisions, mentoring engineers, and ensuring our vehicle systems meet performance, reliability, and safety standards.  The ideal candidate will have a strong background in CAD systems, CFD and FEA simulations, combined with hands-on experience in experimental development and testing of all types of valves (inc. cryogenic).
  • Design and develop a variety of valves, including pneumoactuated, electropneumatic, electrohydraulic check valves, throttles, and regulators.
  • Own requirements definition, architecture trades, and system-level integration for assigned subsystems.
  • Perform CFD analyses to evaluate performance parameters such as pressure drops and hydraulic characteristics.
  • Conduct structural and thermal FEA simulations to ensure reliability and mechanical integrity under operating conditions.
  • Develop and execute test programs, analyze experimental data, and apply findings to optimize designs.
  • Collaborate across mechanical, aerospace, and controls engineering teams to deliver flight-ready hardware.
  • Master’s degree in Mechanical Engineering, Aerospace Engineering, or a related field.
  • 4+ years of industry experience in aerospace propulsion systems or related areas.
  • Hands-on proficiency in CAD tools (Siemens NX, SolidWorks).
  • Strong expertise in Ansys CFX, Fluent, and Mechanical for simulation and analysis.
  • Demonstrated expertise in structural or mechanical design for flight hardware.
  • Experience in early-stage vehicle architecture and design trades.
  • Strong analytical and problem-solving skills with high attention to detail.
  • Excellent written and verbal communication skills.
  • Prior experience designing cryogenic valves for liquid rocket engines or other rocket systems.
  • Practical experience in test bench setup and performance diagnostics.
  • Familiarity with aerospace safety and reliability practices.
  • Experience in a start-up or rapid development environment.

    • Location & Eligibility

    Where is the job
    El Segundo, United States
    On-site at the office
    Who can apply
    US
    Listed under
    United States

    Listing Details

    Posted
    September 23, 2025
    First seen
    March 26, 2026
    Last seen
    May 5, 2026

    Posting Health

    Days active
    39
    Repost count
    0
    Trust Level
    41%
    Scored at
    May 5, 2026

    Signal breakdown

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    Cesiumastro
    Cesiumastro
    lever
    Employees
    350
    Founded
    2017
    Domain
    cesiumastro.com
    Jobs
    View 200 jobs
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    CesiumastroSenior Mechanical Engineer IUSD 126000–168500
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