GNC Engineer III; Trajectory), Alpha

Life at Firefly

At Firefly, we’re focused on making space attainable for everyone – including you! Each team member’s passion, dedication, and innovative ideas have a direct impact on fueling our successful trajectory into space. And there’s no shortage of meaningful projects to work on h launch, lunar, and orbital vehicles, Firefly has a diverse line of business with opportunities to get hands‑on experience launching rockets, operating in space, and landing on the Moon.

Headquartered in the Lone Star State, Firefly’s hardworking team reflects Texas’ GO BIG culture in everything we do. We build big, achieve big, and dream big. We’re building launch vehicles and spacecraft to provide rapid, reliable space access. We’ve achieved some incredible wins, including the first successful commercial Moon landing. And we’re dreaming bigger than this planet with ambitions to Mars, Venus, and beyond.

Our core values are what drive us along the way.

Fireflies believe in perseverance, responsiveness, and mentoring others with a focus on inspiring a better future.

Fireflies act with integrity and take ownership of our actions, commitments, decisions, and outcomes.

Fireflies work in alignment across teams and communicate clearly with mutual respect for one another.

Fireflies deliver high‑quality work through technical rigor and timely disciplined execution for our customers.

We take care of our Fireflies with some of the best benefits in the industry. Our mission to make space for everyone starts with our employees and allowing them to make space for their family, their career, and their future.

• Unlimited PTO for exempt employees
• 3‑month sabbatical for every 5 years of service
• Medical, dental, vision, life, and disability insurance
• Mental health services
• Paid military leave
• 12 weeks paid maternity leave
• 4 weeks paid spouse leave
• $20k towards family planning: fertility, surrogacy, adoption
• Dog friendly workplace

• $10k/year towards trade school or college
• Ongoing coaching to advance leadership skills
• Employee‑ownership with stock bonuses
• 4% Safe Harbor 401(k) matching
• $10k bonus for home purchase in Cedar Park, Texas

From launch technicians to propulsion engineers, Firefly has open roles across the company. We’re looking for passionate, bright innovators to join our team and help make space an achievable dream for everyone.

“You miss all the shots you don’t take. If this is something that interests you, then apply. Being a dedicated, driven team player can carry you far. You can learn about rockets, it’s much harder to learn dedication and passion.” – Meagan Roth, Sr. Director of Systems Engineering and Launch

Firefly Aerospace is a space and defense technology company that enables our world to launch, land, and operate in space – anywhere, anytime. As the partner of choice for critical space missions, Firefly is the only commercial company to launch a satellite to orbit with 24‑hour notice and the only company to achieve a successful Moon landing. Our launch vehicles, lunar landers, and orbital vehicles provide government and commercial customers with full mission services from low Earth orbit to the Moon and beyond.

Headquartered in north Austin, Texas, Firefly is looking for passionate, hardworking innovators to join our team and help fuel our successful trajectory into space.

As a Senior GNC Engineer specializing in trajectory design at Firefly, you will design and optimize trajectories and guidance algorithms for operational launch vehicles. In this role, you will develop powered ascent trajectories and guidance algorithms, support new mission conception and performance analysis, and provide technical leadership while collaborating with multidisciplinary teams. This position combines launch vehicle dynamics, numerical optimization techniques, and hands‑on flight operations support while mentoring junior engineers in a fast‑paced operational environment.

• Design, analyze, and optimize launch vehicle trajectories to maximize performance within operational and vehicle constraints
• Develop and implement launch vehicle guidance algorithms for powered…