Fluids Engineer (m/f/d)

Qualification Checklist

Education & Technical Background

• Degree in mechanical, aerospace, or chemical engineering, or a closely related field
• Strong fundamentals in fluid mechanics, thermodynamics, and cryogenic systems
• Solid understanding of multiphase flow, including liquid–vapor interfaces and heat and mass transfer

Experience

• 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

Skills & Competencies

• 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 (German is a plus)

Benefits

• Employee Participation Program: Share in our success through our virtual company share program
• 30 days of vacation: Enjoy the days off to relax and recharge
• Company pension plan: Secure your future with our company pension plan, featuring a 20% employer contribution after the probation period
• Subsidised lunch: Stay energised with delicious, subsidised lunches every day
• Public transport ticket: Commute with ease using a fully financed Deutschlandticket
• Sport Clubs membership: Stay fit with our sponsored sports club memberships (EGYM Wellpass)
• Individual learning allowance: Grow your skills with an individual learning budget granted after the probation period
• Childcare allowance: Receive a childcare allowance for your non-school-age children
• And Much More! Discover additional perks and benefits when you join our team

Who we are

We are Isar Aerospace and we are at the forefront of New Space building a modern space business to enable faster, better and cheaper access to space.

Our mission is to help democratise space and use it for good in order to improve life on Earth now and for the future generations.

We are a fast-growing company aiming to provide sustainable and environmentally friendly launch solutions for small and medium-sized satellites and constellations into Low Earth Orbit. The company is privately funded by world-leading technology investors with strong commitment and support and our team is made of driven and talented people with a real passion for space innovation.

We're making rockets in a way that hasn't been done before disrupting a traditional industry. If you are up for the challenge, want to work on cutting-edge projects and be part of a team changing the world for better, come, join us and launch your career!

Want to find out more about us?

Visit www.isaraerospace.com

Data Protection

We process your personal data for the purpose of managing the recruitment process and assessing your application. For detailed information on how your data is processed, including your rights, please refer to our Privacy Policy .

Disclaimer

Isar Aerospace SE is an equal-opportunity employer committed to fairness and inclusivity. We do not prioritize any specific religion, gender, nationality, or background. Due to security clearance requirements, affiliations with countries listed under § 13 para. 1 no. 17 SÜG may affect the application process. All qualified applicants are encouraged to apply.

We use Metaview to record interview audio so our team can review it later and stay focused during the conversation. We will record interviews only if you opt in. Please note that we will request your consent separately during the interview process. Participation is completely voluntary and will not affect your application in any way. For more information on how we process your personal data, please see our Privacy Policy .

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Source: Statistisches Bundesamt (Destatis), table; dl-de/by-2-0; StarIn's calculation