Propulsion System Engineer

TL;DR

Propulsion System Engineer (Lunar Missions): Lead propulsion architecture definition and modeling for conceptual-level studies of lunar transportation elements like orbit transfer vehicles and landers with an accent on high-thrust systems including earth-storable and advanced concepts. Focus on developing Python-based models, exploring tradespaces, evaluating cutting-edge technologies, and integrating with multidisciplinary teams for system-level coherence.

Tokyo, Japan / Hybrid. This position is based in Tokyo, Japan and will require you to relocate. This is not a full remote position.

Company

Lunar transportation, infrastructure, and resource utilization company focused on advanced R&D projects from concept to preliminary design.

What you will do

• Lead propulsion architecture definition and modeling for lunar mission elements like orbit transfer vehicles, landers, and orbital infrastructure.
• Develop and maintain Python-based propulsion models for sizing and system-level tradespace analysis.
• Assess, compare, and select propulsion options including pressurization, feed systems, engine cycles, and components to optimize KPIs.
• Investigate cutting-edge propulsion technologies and generate recommendations for R&D roadmaps.
• Support R&D projects including technology demonstrations and customer-driven developments from concept to testing.
• Contribute to business development and collaborate with multidisciplinary teams on system integration.

Requirements

• BSc or Master's degree in mechanical, aerospace, or related engineering fields.
• Five or more years of relevant experience in analytical modelling of chemical propulsion (pressurization, feeding systems, boil-off, propellant management, rocket engine cycles, mass/fluid budgets).
• Solid understanding of mission-level propulsion considerations (delta-V budgeting, propellants, feedsystems, sloshing, mission environments).
• 3 years of experience with modelling languages like Python (NumPy, SciPy, Pandas, Matplotlib) or MATLAB.
• Ability to work in fast-paced, ambiguous conceptual environments with proactive technical ownership.

Nice to have

• Experience in propulsion component selection trading off compatibility, schedule, and cost.
• Experience with advanced propulsion like cryogenic and hybrid rocket systems.
• Experience in systems engineering using Model Based Systems Engineering.
• Experience with conceptual design methods, low-fidelity modeling, or early-phase systems engineering.
• Experience using Git for version control in CI/CD environments.