Senior​/Principal Propulsion Engineer; pipeline

Senior / Principal Propulsion Engineer (Pipeline)

Stennis Space Center, MS

Rocket Lab is an end-to-end space company delivering responsive launch services, complete spacecraft design and manufacturing, payloads, satellite components, and more – all with the goal of opening access to space. The rockets and satellites we build and launch enable some of the most ambitious and vital space missions globally, supporting scientific exploration, Earth observation and missions to combat climate change, national security, and exciting new technology demonstrations.

Our Electron rocket has become the second most frequently launched U.S. rocket annually and has delivered more than 230 satellites to orbit, all while we work to develop Neutron, our upcoming medium-lift, reusable launch vehicle for larger constellation deployment. Our Space Systems business designs and builds our extensive line of satellites, payloads, and their components, including spacecraft that have been selected to support NASA missions to the Moon and Mars and components used on the James Webb Space Telescope.

Rocket Lab's Neutron team is responsible for bringing our new large rocket Neutron and its launch and test sites to life. From designing and testing Neutron's structures and components, to firing up its new Archimedes engines, to setting up Neutron's launch pads and test sites across the United States, joining the Neutron team is your opportunity to help launch a new large rocket for the very first time.

As Senior/Principal Propulsion Engineer, you will play a critical role in the development, testing, and operation of the Archimedes Engine family, a cornerstone of the Neutron rocket program. You will take ownership of subsystems and engine operation, driving design, analysis, testing, and operational readiness. You will execute testing campaigns, analyze data, improve existing evaluation capability and refine designs for reliability and vehicle operations.

This role demands technical expertise, strong autonomy, and the ability to align teams and projects to achieve program goals. Principal Engineers will additionally drive value to teams outside their group, influencing cross-functional efforts and contributing to the broader success of the Neutron program.

What You'll Get To Do:

• Design, analyze, test, fly, and refly next generation propulsion hardware ensuring operational readiness and flight success.
• Develop and execute test plans, including qualification and acceptance testing, and conduct post-test data reviews to refine designs and processes.
• Collaborate across engineering disciplines to optimize engine performance, reliability, and manufacturability.
• Generate high-level plans and prioritize tasks across teams, resolving competing priorities and ensuring alignment with program goals.
• Mentor and guide engineers, fostering technical growth and collaboration.
• Work with manufacturing, testing and vehicle operation teams to support engine needs, operation, and resolve issues each part of the engine lifecycle.

Please note:

This position can be hired as a Senior Propulsion Engineer I, Senior Propulsion Engineer II or Principal Propulsion Level.

You'll Bring These Qualifications As A Senior Propulsion Engineer I:

• Bachelor's degree in mechanical engineering, aerospace engineering, or related field.
• 5+ years of experience in rocket engine development, testing, or operations.
• Strong technical understanding of fluid dynamics, thermodynamics, cryogenic systems, and rocket engine architecture.
• Familiarity with engine P&IDs, fluid system routing, and hotfire data reviews.

You'll Bring These Qualifications As A Senior Propulsion Engineer II:

• Bachelor's degree in mechanical engineering, aerospace engineering, or related field.
• 8+ years of experience in rocket engine development, testing, or operations.
• Strong technical understanding of fluid dynamics, thermodynamics, cryogenic systems, and rocket engine architecture.
• Familiarity with engine P&IDs, fluid system routing, and hotfire data reviews.

You'll Bring These Qualifications As A Principal Propulsion Engineer:

• Bachelor's degree in mechanical engineering, aerospace engineering, or related field.
• 12+ years of…