Guidance, Navigation and Controls Engineer II​/III - Rendezvous and Proximity Operations

Sierra Space Careers:

At Sierra Space, we build the missions and systems that keep our world secure in the domain above Earth.

Sierra Space team members share a spirit of innovation and collaboration and a belief that we can deliver on the boldest missions in space today. Together with our customers, we aim to safeguard our nation, sustain human presence in space, and secure the freedom of operations in low Earth orbit and beyond.

Our success is measured by the trust of those who rely on what we build and deliver, and our technologies keep the United States and its allies mission-ready throughout space.

We are mission-driven, and together, we are an extraordinary team.

About the Role

Sierra Space is seeking a Guidance, Navigation & Controls Engineer II to contribute to the design, analysis, and implementation of advanced GNC systems for spacecraft applications. This mid-level role is ideal for engineers with foundational experience in dynamic modeling, algorithm design, and simulation analysis. The selected candidate will work independently on complex tasks while collaborating with cross-functional teams to ensure system performance and compliance with requirements.

This position offers the opportunity to expand technical expertise and take ownership of key GNC subsystems.

In this role, you will develop, implement, and evaluate GNC algorithms, focusing on one or more areas of guidance, navigation, control, and Fault Detection, Isolation, and Recovery (FDIR). You will program and optimize simulations using SIMULINK and STK, while modeling and analyzing GNC sensors and actuators such as IMUs, GPS, star trackers, Reaction Control Systems (RCS), Reaction Wheels, Magnetic Torquer Bars, Control Moment Gyros, and LIDAR.

Additionally, you will run and modify Monte Carlo simulations, performing in-depth analysis to identify issues and optimize system performance. You will analyze and implement autonomous GNC mode transitions to ensure system reliability and robustness, take ownership of a group of performance requirements by conducting relevant analysis to ensure compliance, and work with GNC flight software (FSW) in target test simulation environments to validate functionality.

Furthermore, you will document technical findings and communicate results to stakeholders and team members.

About You

Our mission is driven by an unyielding commitment to advancing space-based technology in service of our customers and safeguarding national security. We seek individuals who are passionate about innovating beyond boundaries and relentlessly pursuing solutions that protect, preserve and empower - to join us in this critical mission.

We're looking for team members who align with our values, mission and goals - while also meeting the minimum qualifications below. The preferred qualifications are a bonus, not a requirement.

Minimum Qualifications:

* Bachelor's degree in aerospace engineering, mechanical engineering, electrical engineering, or a related technical field (or equivalent work experience in lieu of degree).

* 2+ years of relevant experience in dynamic modeling and GNC algorithm design.

* Strong proficiency in SIMULINK programming and STK, with familiarity in C, C++, Python, and version control tools such as GIT/SVN.

* Fundamental knowledge of GNC algorithms and experience with designing at least one of guidance, navigation, control, or FDIR algorithms.

* Understanding of the working principles of IMUs, GPS, star trackers, RCS, non-propulsive actuators (Reaction Wheels, Magnetic Torquer Bars, Control Moment Gyros), and LIDAR.

* The ability to obtain and maintain a U.S. Security Clearance is require.

Preferred Qualifications:

* 2+ years of industry experience or master's degree with concentration in Rendezvous and Proximity Operations, demonstrating proficiency in trajectory planning, relative motion dynamics, and GN&C algorithms for spacecraft maneuvers

* Demonstrated knowledge of autonomous docking systems and collision avoidance techniques, with experience applying relative navigation sensors and orbital mechanics principles in academic or professional settings

* Background in Rotational Dynamics (kinematics and kinetic analysis)

* Strong foundation in orbital mechanics principles, including Restricted 2-Body Equation of Motion, Classical (Keplerian) Orbital Elements, and relative motion dynamics in multiple reference frames

* Strong fundamental knowledge of dynamic modeling, control, guidance, or navigation algorithm design, state-space systems, SISO, and MIMO systems.

* Experience running Monte Carlo simulations and performing in-depth analysis to troubleshoot and optimize GNC systems.

* Strong understanding of autonomous GNC mode transitions and ability to perform relevant analysis.

* Familiarity with SIMULINK autocoding and Linux systems for simulation and software integration.

* Ability to take ownership of performance requirements and conduct detailed analysis to ensure compliance.

* Experience working with GNC flight software in target…