GNC Engineer II, Hypersonics

Firefly Aerospace; Cedar Park (TX); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Health, dental and vision plans

Parental leave

Educational reimbursement

Flexible PTO options

Job summary

Firefly Aerospace in Texas seeks a GNC Engineer to design, analyze, and operate the GNC systems of launch vehicles. You will develop GNC and simulation software, perform dynamic analyses, and support mission operations in a fast-paced environment.

This role offers hands-on experience with ascent guidance, attitude control, and real-time flight operations, helping you broaden core GNC competencies and grow toward a senior position.

Qualifications

• Bachelor's degree in aerospace, mechanical, electrical engineering, physics, math, CS, or related field.
• 2-5 years in aerospace guidance, navigation, and control or related discipline.
• Understanding of launch vehicle flight mechanics and attitude dynamics.
• Experience with Python for scripting, data analysis, and visualization.
• C++ for embedded or real‑time applications; familiarity with Git, CI/CD, and testing.
• Strong communication skills; Advanced degree and experience with GNC across development, integration, and flight are a plus.

Responsibilities

• Develop and validate GNC software to ensure launch vehicle mission execution.
• Tune attitude determination and control algorithms for all flight phases.
• Perform 6DOF dynamic analysis of ascent trajectories.
• Develop and maintain simulation models for sensors, actuators, and environmental effects.
• Create tools to automate workflows, process flight data, and generate reports.
• Interface with cross-disciplinary teams to integrate GNC with vehicle hardware.
• Serve as GNC console operator for launch operations and perform post-flight analysis.

Skills

GNC software

Python

C++

Trajectory design

Systems engineering

Education

Bachelor's degree in aerospace/related field

Master's or PhD in related field

Tools

Git

Linux

CI/CD

Real-time OS

Job description

Career Opportunities with Firefly Aerospace

Come be a part of the 21 st Century Space Race!

Careers At Firefly Aerospace

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Firefly Aerospace is a space and defense technology company on a mission to reliably and repeatedly launch, land, and operate space systems from Earth to the Moon and beyond. As the partner of choice for critical space missions, Firefly is the first commercial company to launch a satellite to orbit with 24-hour notice and the first company to achieve a successful Moon landing. Headquartered in north Austin, Texas, Firefly is looking for passionate, hardworking innovators to join our team and help fuel our successful trajectory into space.

SUMMARY

As a GNC Engineer at Firefly, you will design, analyze, and operate the GNC systems of operational launch vehicles. In this role, you will develop GNC and simulation software, perform dynamic analyses, and support mission operations while continuing to build breadth across core GNC competencies. This position offers hands‑on experience with launch vehicle ascent guidance, attitude control systems, and real‑time flight operations in a fast‑paced environment. You will deepen your technical capabilities and refine your desired career trajectory, taking ownership of system elements and software tools as you grow toward a senior GNC role at Firefly.

RESPONSIBILITIES

Develop and validate GNC software to ensure successful launch vehicle mission execution

Tune and configure attitude determination and control algorithms for all phases of launch vehicle flight

Perform 6DOF dynamic analysis of nominal and dispersed ascent trajectories

Develop and maintain simulation models for sensors, actuators, and environmental effects

Create tools to automate workflows, process flight data, and generate technical reports

Conduct stability analysis, sensitivity studies, and hardware-in-the-loop testing of GNC systems under nominal and off‑nominal flight conditions

Interface with cross‑discipline teams to integrate GNC software with vehicle hardware

Serve as a GNC console operator for launch operations and perform post‑flight analysis to improve vehicle models

Author technical documentation and analysis reports that communicate GNC concepts and results to diverse audiences

Build proficiency across core GNC competencies while contributing to continuous improvement of GNC processes and tools

QUALIFICATIONS

Required

Bachelor's degree in aerospace engineering, mechanical engineering, electrical engineering, physics, mathematics, computer science, or related field

2-5 years of professional experience in aerospace guidance, navigation, and control, or related technical discipline

Understanding of launch vehicle flight mechanics and attitude dynamics

Familiarity with numerical simulation techniques, integration methods, and modeling of dynamic systems

Experience with Python for scripting, data analysis, and visualization

Familiarity with C++ for real‑time or flight‑critical applications

Understanding of software development best practices including version control (Git), code documentation, and testing

Strong written and verbal communication skills

Advanced degree (master's or PhD) in aerospace engineering or related field with focus on GNC, flight mechanics, or controls

Experience supporting launch vehicle GNC across development, integration, and flight

Proficiency in C++ for embedded systems or real‑time applications

Knowledge of state estimation techniques including Kalman filtering, sensor fusion, and covariance analysis

Knowledge of numerical optimization and targeting methods applied to trajectory design

Familiarity with modern flight software frameworks and real‑time operating systems

Familiarity with CI/CD workflows and automated testing practices

Experience with Linux development environments and command‑line tools

Exposure to spaceflight mission operations or launch campaigns

Firefly offers outstanding benefits for our employees, including generous health, dental and vision plans with low plan deductibles, parental leave, educational reimbursement, short term disability, and flexible PTO options.

To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR) you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.

Firefly Aerospace, Inc. is an Equal Opportunity Employer; employment with Firefly is governed based on merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.