Isar Aerospace is a Munich-based aerospace company developing the Spectrum orbital launch vehicle and commercial launch services.
<p><strong><span lang="EN-US">Mission Brief <br><br></span></strong><span lang="EN-US"><span class="TextRun SCXW186829695 BCX8" lang="EN-GB" data-contrast="auto"><span class="NormalTextRun SCXW186829695 BCX8">As a Fluids Engineer in the Reusability Program, you analyse propellant behaviour across changing thermal conditions, transient operating states, and mission phases including ascent, shutdown, coast, </span><span class="NormalTextRun SCXW186829695 BCX8">reentry</span><span class="NormalTextRun SCXW186829695 BCX8">, and relight. Your work directly drives propellant management, pressurization, and feed system design for next</span></span><span class="NoBreakHyphenBlob BlobObject DragDrop SCXW186829695 BCX8">‑</span><span class="TextRun SCXW186829695 BCX8" lang="EN-GB" data-contrast="auto"><span class="NormalTextRun SCXW186829695 BCX8">generation reusable launch vehicles.</span></span><span class="EOP SCXW186829695 BCX8" data-ccp-props="{"201341983":0,"335551550":6,"335551620":6,"335559740":360}"> </span></span></p> <p><span class="TextRun SCXW114497174 BCX8" lang="EN-US" data-contrast="auto"><span class="NormalTextRun CommentStart CommentHighlightPipeRest CommentHighlightRest SCXW114497174 BCX8">Your Role in Our Space Mission</span></span><span lang="EN-US"><span class="EOP CommentHighlightPipeRest SCXW114497174 BCX8" data-ccp-props="{"201341983":0,"335551550":6,"335551620":6,"335559740":360}"> </span></span></p> <ul> <li>Define and analyse the overall propellant management architecture, including propellant location, acquisition strategy, residuals, depletion behaviour, and their interaction across mission phases</li> <li>Analyse microgravity and low-acceleration propellant dynamics, including propellant surface behaviour modelled with VOF methods and coupled heat and mass transfer, to drive architectural choices</li> <li>Derive tank pressurization concepts from mission requirements and reusability constraints, including transient behaviour across mission phases</li> <li>Perform NPSP and inlet margin trades, including the influence of propellant thermal state and transient operating conditions on engine behaviour</li> <li>Analyse propellant routing, including feedlines and valves, with focus on transients, operability, and reuse robustness</li> <li>Define pressurization and consumables architecture in the context of reusability, including sizing logic, margins, and operational envelopes</li> <li>Develop reduced order models from high‑fidelity analyses to support vehicle‑level and program‑level trade studies </li> </ul> <p><strong><span lang="EN-US"><span class="EOP CommentHighlightPipeRest SCXW114497174 BCX8" data-ccp-props="{"201341983":0,"335551550":6,"335551620":6,"335559740":360}">Qualification Checklist </span></span></strong></p> <p>Education & Technical Background </p> <ul> <li>Degree in mechanical, aerospace, or chemical engineering, or a closely related field</li> <li>Strong fundamentals in fluid mechanics, thermodynamics, and cryogenic systems</li> <li>Solid understanding of multiphase flow, including liquid–vapor interfaces and heat and mass transfer </li> </ul> <p>Experience </p> <ul> <li>3–5 years of experience in propulsion, fluids, or propellant management related roles</li> <li>Hands‑on experience analysing propellant behaviour at system or architecture level, not only single components</li> <li>Practical experience with VOF or comparable multiphase modelling, including thermal effects and free‑surface behaviour</li> <li>Exposure to microgravity or low‑acceleration propellant dynamics and their impact on system operability</li> <li>Experience deriving or contributing to tank pressurization architectures, including transient behaviour</li> <li>Experience abstracting high‑fidelity analysis into reduced order models for vehicle or program‑level trade studies </li> </ul> <p>Skills & Competencies </p> <ul> <li>Ability to derive propellant management and pressurization architectures from mission requirements, operating envelopes, and reusability constraints</li> <li>Capability to quantitatively assess trade‑offs between propellant management concepts using first‑principles analysis, scaling laws, and targeted high‑fidelity simulations</li> <li>Critical judgement of model assumptions, numerical limitations, and validity ranges</li> <li>Comfortable balancing analysis fidelity, computational cost, and engineering timelines</li> <li>Clear communication of complex fluid behaviour to non‑fluids specialists</li> <li>Structured, physics‑driven problem‑solving mindset</li> <li>Fluent in English (German is a plus) </li> </ul> <p><strong><span lang="EN-US">Benefits </span></strong></p> <ul> <li><strong>Employee Participation Program: </strong>Share in our success through our virtual company share program</li> <li><strong>30 days of vacation: </strong>Enjoy the days off to relax and recharge</li> <li><strong>Company pension plan:</strong> Secure your future with our company pension plan, featuring a 20% employer contribution after the probation period</li> <li><strong>Subsidised lunch:</strong> Stay energised with delicious, subsidised lunches every day</li> <li><strong>Public transport ticket: </strong>Commute with ease using a fully financed Deutschlandticket</li> <li><strong>Sport Clubs membership: </strong>Stay fit with our sponsored sports club memberships (EGYM Wellpass)</li> <li><strong>Individual learning allowance:</strong> Grow your skills with an individual learning budget granted after the probation period</li> <li><strong>Childcare allowance:</strong> Receive a childcare allowance for your non-school-age children</li> <li><strong>And Much More!</strong> Discover additional perks and benefits when you join our team </li> </ul> <p><strong><span lang="EN-US">Who we are</span></strong></p> <p><strong><span lang="EN-US"><iframe src="https://www.youtube.com/embed/jW2V5vsMb_k"