Guidance, Navigation & Controls; GN&C) Engineer

Location: Huntsville, AL

Job :4100

# of Openings:1

Req#: 4100

The vision at Craig Technologies is to make space accessible to everyone by increasing the viability of low-cost access to space. At Craig Technologies, our whole is greater than the sum of our parts. The Craig Technologies team is made up of highly talented individuals, each contributing their own experience, knowledge, skills, and ideas. It is our team that sets us apart from our competition and makes our mission of Bringing Space Down to Earth™ possible.

At Craig Technologies we treat each day like it’s Day One. We operate with a sense of urgency; we are customer obsessed, always learning and constantly evolving. Join our team and be a part of something great!

Craig Technologies is seeking a Guidance, Navigation, and Controls (GN&C) Engineer to join our team in Huntsville, AL, Houston, TX or Merritt Island, FL. The candidate will contribute to the design, development, and testing of the GN&C system for the Lunar Data Network (LDN) spacecraft, which will provide crucial navigation and communications services to lunar users. This position will support real-time GN&C flight software development, flight control automation, hardware-in-the-loop (HWIL) sensor and effector integration, orbital performance analysis, and autonomous deep-space maneuvering validation.

• Contribute to the design, architecture development, and verification testing of the GN&C system for the Lunar Data Network (LDN) spacecraft constellation.
• Develop, test, and peer-review high-reliability GN&C flight software and control algorithms written in C and C++.
• Support the selection, trade studies, procurement, and integration of specialized deep-space GN&C sensors and effector systems.
• Execute, maintain, and analyze 6-DOF (Degrees of Freedom) simulations and Monte Carlo profiles to evaluate expected on-orbit performance and trajectory stability in cislunar space.
• Support navigation HWIL (Hardware-in-the-Loop) and SWIL (Software-in-the-Loop) sensor and effector integration and testing for the LDN satellite constellation.
• Assist in real-time flight software development, testing, and implementation of autonomous fault-tolerant recovery logic for navigation anomalies.
• Incorporate relative navigation, image processing, or feature detection techniques to support operations where traditional Earth-based GPS is unavailable.
• Collaborate closely with cross-functional engineering teams across software, hardware, and mission operations systems.
• Document software architectures, design trades, and simulation results in clean technical reports and presentations.
• Other duties as assigned.

• Strong interpersonal, communication, and technical documentation skills with an ability to communicate complex data clearly and effectively.
• High level critical thinking, mathematical reasoning, and a detail-oriented engineering mindset.
• Ability to work independently or adapt quickly as part of a multi-disciplinary, fast-paced space systems team.

• Bachelor's or Master's Degree in Aerospace Engineering, Electrical Engineering, or a highly related field plus 3–5 years of relevant experience.
• 3–5 years of direct experience writing flight or simulation software in C, C++, and/or Python.
• Proven experience developing, tuning, and implementing Extended Kalman Filters (EKFs) or sequential filters for spacecraft state estimation.
• Familiarity with deep-space or satellite GN&C hardware architectures, including IMUs, Star Trackers, Reaction Wheels, and Thruster clusters.
• Experience with relative navigation, Optical Navigation (OpNav), or feature detection techniques optimized for lunar or planetary environments.
• Foundational knowledge of spacecraft rigid-body…