Senior / Principal Propulsion Engineer (Aerospace)

Location: Stennis Space Center, Mississippi, United States

Company

hirify.global is an end-to-end space company developing rockets, spacecraft, and critical subsystems, including the Neutron launch vehicle and its Archimedes engines.

What you will do

• Design, analyze, test, fly, and refly next-generation propulsion hardware for the Neutron rocket.
• Own propulsion subsystems and engine operations, driving design, analysis, testing, and operational readiness.
• Develop and execute qualification and acceptance test plans, then review post-test and hotfire data to refine designs and processes.
• Collaborate with engineering, manufacturing, testing, and vehicle operations teams to improve engine performance, reliability, manufacturability, and lifecycle support.
• Plan and prioritize work across teams, resolve competing priorities, and align technical execution with program goals.
• Mentor engineers and, at the Principal level, influence cross-functional efforts beyond the immediate group.

Requirements

• Bachelor’s degree in mechanical engineering, aerospace engineering, or a related field.
• 5+ years of experience for Senior Propulsion Engineer I, 8+ years for Senior Propulsion Engineer II, or 12+ years for Principal Propulsion Engineer in rocket engine development, testing, or operations.
• Strong understanding of fluid dynamics, thermodynamics, cryogenic systems, and rocket engine architecture.
• Familiarity with engine P&IDs, fluid system routing, and hotfire data reviews.
• For work in U.S. offices, candidates must satisfy applicable ITAR requirements, such as being a U.S. citizen, lawful permanent resident, refugee, asylee, or eligible to obtain the required authorization.
• Ability to work with prolonged periods of sitting, standing, walking, and computer use, with occasional exposure to moderate noise, dust, and fumes in production areas.

Nice to have

• Advanced degree in a fluid-mechanics-heavy field.
• Experience with oxygen-rich staged combustion systems and Methyl/LOX propellants.
• Background in failure analysis, combustion dynamics, turbopump mechanics, or hydraulics.
• Experience with reusable rocket engines, test and launch facility operations, and design, qualification, and production best practices.

Culture & Benefits

• Work on real spaceflight hardware and meaningful missions expanding access to the Moon, Mars, and beyond.
• Fast-paced environment focused on innovation, teamwork, technical ownership, and delivery under tight deadlines.
• Collaborative culture emphasizing mentorship, cross-functional support, and practical problem-solving.
• Equal employment opportunity and reasonable accommodation support are provided for eligible U.S. applicants.