Principal Propulsion Engineer, Blue Thrusters

Blue Origin; Washington; On-site; USD 150,000 - 210,000; Full time

Job summary

Blue Origin Engines is seeking a Principal Propulsion Engineer to lead the design, development, and testing of thruster combustion devices and propulsion systems. You will drive performance, stability, and reliability while mentoring engineers across multiple disciplines.

The role focuses on connecting injector, chamber, and valve decisions to meet mission objectives for commercial and governmental spaceflight programs. A hands-on expert with deep combustion knowledge is essential.

Qualifications

• B.S. or higher in Aerospace Engineering, Mechanical Engineering, or related field.
• 10+ years in liquid rocket engine or spacecraft thruster development.
• Hands-on design and analysis of injectors and thrust chambers.
• Experience planning and analyzing hot-fire tests of liquid propulsion hardware.
• Understanding of propellant valves and transient behavior.
• Experience supporting technical failure investigations and corrective actions.
• Ability to work across disciplines and make sound decisions with incomplete information.

Responsibilities

• Design, analyze, and develop thruster combustion devices with focus on performance and stability.
• Contribute to integrated thruster design including valves and feed interfaces.
• Plan and support hot-fire test campaigns and data review.
• Investigate anomalies and apply first-principles analysis.
• Mentor engineers on injector and chamber design and testing.
• Collaborate with systems, vehicle, electrical, software, manufacturing and test teams to resolve interfaces.

Skills

Aerospace engineering

Propulsion

Thruster design

Combustion analysis

Hot-fire testing

Failure investigations

Cross-functional collaboration

Education

Bachelor's degree in Aerospace Engineering

Job description

Application close date: Applications will be accepted on an ongoing basis until the requisition is closed.

At Blue Origin, we envision millions of people living and working in space for the benefit of Earth. We're working to develop reusable, safe, and low-cost space vehicles and systems within a culture of safety, collaboration, and inclusion. Join our team of problem solvers as we add new chapters to the history of spaceflight!

This role is part of the Blue Origin Engines business unit, where our focus is the design, development, manufacturing, and testing of engines and propulsion systems. Built for multiple uses, our family of engines is powering the next generation of rockets for commercial, civil, national security, and human spaceflight.

About the Role

At Blue Origin, we envision millions of people living and working in space for the benefit of Earth. We're working to develop reusable, safe, and low-cost space vehicles and systems within a culture of safety, collaboration, and inclusion. Join our team of problem solvers as we add new chapters to the history of spaceflight!

This role is part of the Blue Origin Engines business unit, where our focus is the design, development, manufacturing, and testing of propulsion products. Built for multiple uses, our family of engines and thrusters are powering the next generation of rockets and spacecraft for commercial, civil, national security, and human spaceflight.

As a Principal Propulsion Engineer on the Blue Thrusters team, you will be a hands-on expert in thruster combustion devices and a key contributor to bringing our thrusters from concept through qualification and flight. You will bring deep experience in combustion devices design, analysis, and test, along with a working knowledge of the thruster valves and propellant feed systems that control them. You will help connect injector, chamber, and valve decisions so our thrusters meet performance, stability, life, and reliability goals.

You will spend your time on design, analysis, and test, working closely with fellow engineers, test teams, and manufacturing partners. You will also share your expertise by mentoring engineers and strengthening the team's technical work product.

We are looking for someone with the technical depth to solve hard combustion problems, the curiosity to understand how each component affects thruster behavior, and the collaborative approach to turn good ideas into flight hardware. Passion for our mission and vision is required!

Key Responsibilities

• Design, analyze, and develop thruster combustion devices, including injectors and chambers, with a focus on performance, combustion stability, and thermal behavior
• Contribute to thruster-level design work that integrates combustion devices, propellant valves, feed system interfaces, and drive electronics
• Perform and review performance, stability, thermal, and transient analyses, and correlate results with test data to improve designs
• Develop a working understanding of valve capabilities and limitations (response time, flow characteristics, leakage, actuation type, and operating environment) and partner with the valve engines on requirement and interface definition
• Plan and support thruster hot-fire test campaigns, including test article definition, instrumentation, test execution, and data review
• Investigate anomalies and failures from root cause through corrective action, applying first-principles analysis
• Drive engineering trade studies with sound analysis and clear recommendations
• Develop and improve analysis tools and practices, such as performance and stability codes, hot-fire data trending, and data reduction and plotting tools
• Mentor and coach engineers on injector and chamber design, analysis, hot-fire testing, and data review
• Collaborate with systems, vehicle, electrical, software, manufacturing, and test operations teams to define interfaces and resolve integration issues early
• Identify technical risks early and communicate them clearly to your team and leadership
• Author and review technical reports, test plans, qualification documentation, and engineering specifications

Minimum Qualifications

• B.S. or higher in Aerospace Engineering, Mechanical Engineering, or a related technical field
• 10+ years of experience in liquid rocket engine or spacecraft thruster development
• Hands-on experience designing and analyzing injectors and thrust chambers, including performance, combustion stability, and thermal analysis
• Experience planning, conducting, and analyzing results from hot-fire testing of liquid propulsion hardware
• Solid understanding of propellant valves (solenoid, pneumatically actuated, or similar) and how valve characteristics affect ignition, start and shutdown transients, pulsing performance, and overall thruster behavior
• Experience supporting technical failure investigations and implementing design corrections
• Ability to work across disciplines and make sound technical decisions with incomplete information
• Strong com