GPS Subject Matter Expert (Enterprise PNT Systems SME)

Stellar Solutions•El Segundo, CA

7d•$160,000 - $190,000•Onsite

About The Position

Overview Stellar Solutions, a nationally recognized “Great Place To Work”, has exciting opportunities providing Engineering solutions for innovative new-entrant space companies, as well as established space systems manufacturers, commercial space system operators and service providers, and other industry stakeholders including investors. At Stellar Solutions, we offer talented, energetic, and immediately productive resources to satisfy our customers’ critical needs in systems engineering and integration, mission operations, program management and strategic planning. We are a leading service and expertise provider for high-tech commercial ventures, spanning communications, earth observation and remote sensing systems and data products, to the infrastructures that support earth orbiting and beyond earth orbit businesses. Role/Responsibilities/Qualifications Stellar Solutions is seeking a GPS Subject Matter Expert (SME) to support enterprise-level modernization of the Global Positioning System (GPS) for the U.S. Space Force. This role will provide deep technical expertise across the GPS space, ground, and user segments, supporting integration and evolution of the GPS III and GPS III Follow-On (GPS IIIF) constellation as the system transitions to the modernized Next Generation Operational Control System (OCX). The candidate will advise government and contractor teams on Positioning, Navigation, and Timing (PNT) architecture, modernization initiatives, and the integration of new GPS capabilities such as M-Code, L1C interoperability, and Regional Military Protection (RMP). GPS Enterprise Systems Expertise Provide subject matter expertise across the GPS enterprise architecture including the space segment (GPS III / GPS IIIF satellites), control segment (OCX ground system), and user segment (military and civil GPS receivers). GPS III / GPS IIIF Modernization Support Support integration of next-generation GPS capabilities including M-Code military signal deployment, L1C interoperability with international GNSS systems, Regional Military Protection (RMP) spot beam capability, satellite navigation payload enhancements, and laser retroreflector arrays. Positioning, Navigation, and Timing Architecture Support development and analysis of enterprise PNT architecture including resilient PNT strategies for contested environments, multi-GNSS interoperability, augmentation systems, and timing synchronization dependencies across critical infrastructure. Systems Engineering and Integration Support system-of-systems integration across GPS enterprise components including requirements definition, architecture documentation, Interface Control Documents (ICDs), technical baseline management, and systems engineering reviews (SRR, PDR, CDR). Acquisition and Program Support Provide advisory support to government program offices including technical evaluation of contractor designs, acquisition planning support, risk identification and mitigation, and participation in program milestone reviews.

Requirements

10+ years experience in GPS or satellite navigation systems
Experience with Positioning, Navigation, and Timing (PNT) technologies
Knowledge of GPS space, ground, and user segment
Systems engineering experience across space or defense program
Familiarity with DoD acquisition lifecycle and space program
Bachelor’s degree in Engineering, Physics, Mathematics, or related field
Ability to obtain or maintain a DoD security clearance

Nice To Haves

Experience supporting Space Systems Command (SSC) or Space Operations Command
Knowledge of GPS III / GPS IIIF program
Experience with M-Code or NAVWAR technologie
Experience with OCX ground system
Familiarity with GNSS interoperability (Galileo, etc.)
Master’s degree in Engineering or related field
Active Secret or Top Secret Clearance

Responsibilities

Provide subject matter expertise across the GPS enterprise architecture including the space segment (GPS III / GPS IIIF satellites), control segment (OCX ground system), and user segment (military and civil GPS receivers).
Support integration of next-generation GPS capabilities including M-Code military signal deployment, L1C interoperability with international GNSS systems, Regional Military Protection (RMP) spot beam capability, satellite navigation payload enhancements, and laser retroreflector arrays.
Support development and analysis of enterprise PNT architecture including resilient PNT strategies for contested environments, multi-GNSS interoperability, augmentation systems, and timing synchronization dependencies across critical infrastructure.
Support system-of-systems integration across GPS enterprise components including requirements definition, architecture documentation, Interface Control Documents (ICDs), technical baseline management, and systems engineering reviews (SRR, PDR, CDR).
Provide advisory support to government program offices including technical evaluation of contractor designs, acquisition planning support, risk identification and mitigation, and participation in program milestone reviews.