Isar Aerospace SE
New Space
FluidsEngineer(m/f/d)
“Fluids Engineer (m/f/d) at Isar Aerospace SE. Skills: propellant management, pressurization systems, multiphase flow analysis, reusable launch vehicles. analyse propellant behaviour across changing thermal conditions, transient operating states, and mission phases including ascent, shutdown, coast, reentry, and relight. Define and analyse the overall propellant management architecture, including propellant location, acquisition strategy, residuals, depletion behaviour, and their interaction acro”
What You'll Achieve.
Your work directly drives propellant management, pressurization, and feed system design for next‑generation reusable launch vehicles.
Industry & Context.
Structured, physics‑driven problem‑solving mindset; Critical judgement of model assumptions, numerical limitations, and validity ranges; balancing analysis fidelity, computational cost, and engineering timelines
Due to security clearance requirements, affiliations with countries listed under § 13 para. 1 no. 17 SÜG may affect the application process.
What They're Looking For.
Must Have
Degree in mechanical, aerospace, or chemical engineering, or a closely related field, fundamentals in fluid mechanics, thermodynamics, and cryogenic systems, Solid understanding of multiphase flow, including liquid–vapor interfaces and heat and mass transfer, 3–5 years of experience in propulsion, fluids, or propellant management related roles, Hands‑on experience analysing propellant behaviour at system or architecture level, not only single components, Practical experience with VOF or comparable multiphase modelling, including thermal effects and free‑surface behaviour, Exposure to microgravity or low‑acceleration propellant dynamics and their impact on system operability, Experience deriving or contributing to tank pressurization architectures, including transient behaviour, Experience abstracting high‑fidelity analysis into reduced order models for vehicle or program‑level trade studies, Ability to derive propellant management and pressurization architectures from mission requirements, operating envelopes, and reusability constraints, Capability to quantitatively assess trade‑offs between propellant management concepts using first‑principles analysis, scaling laws, and targeted high‑fidelity simulations, Critical judgement of model assumptions, numerical limitations, and validity ranges, Comfortable balancing analysis fidelity, computational cost, and engineering timelines, Clear communication of complex fluid behaviour to non‑fluids specialists, Structured, physics‑driven problem‑solving mindset, Fluent in English
Nice to Have
German is a plus
What You'll Do.
analyse propellant behaviour across changing thermal conditions
transient operating states
and mission phases including ascent
Define and analyse the overall propellant management architecture
including propellant location
and their interaction across mission phases
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
Derive tank pressurization concepts from mission requirements and reusability constraints
including transient behaviour across mission phases
Perform NPSP and inlet margin trades
including the influence of propellant thermal state and transient operating conditions on engine behaviour
Analyse propellant routing
including feedlines and valves
with focus on transients
Define pressurization and consumables architecture in the context of reusability
including sizing logic
and operational envelopes
Develop reduced order models from high‑fidelity analyses to support vehicle‑level and program‑level trade studies
How You'll Work.
Team & Collaboration
Clear communication of complex fluid behaviour to non‑fluids specialists
Communication Scope
Clear communication of complex fluid behaviour to non‑fluids specialists
Applying for this Fluids Engineer (m/f/d) role?
Most applicants get filtered before a human reads their resume. See if yours makes the cut.
How to Apply on Greenhouse
- Create a Greenhouse profile before applying — it saves time across multiple applications.
- Upload your resume as a PDF; the parser handles it better than Word.
- Answer all knockout questions carefully — wrong answers auto-reject before a human sees you.
- Enable email notifications to track application status in real time.
ANONYMOUS · UNFILTERED
What do employees actually say about Isar Aerospace SE?
Real rants from real employees. Read before you apply.