We are seeking an exceptionally skilled Senior GNSS Systems Engineer with a minimum of 10 years of hands-on experience in GNSS engineering, satellite systems, and advanced positioning, navigation, and timing (PNT) technologies. This is a senior-level technical leadership role requiring deep, first-principles expertise across the full GNSS signal chain — from satellite constellation physics and signal generation through receiver design, carrier phase tracking, and precision position and time solutions delivered to ground terminals. The successful candidate will lead the design and delivery of a custom satellite-based wireless positioning and timing transfer service operating across S-Band and L-Band frequencies. This system will transmit simultaneous multi-source signals that ground terminals can receive, correlate, and process to extract carrier phase differentials, enabling high-accuracy ranging, time delta computation, and precise geolocation. The role demands mastery of both the theoretical underpinnings of GNSS — including relativistic time corrections, ionospheric and tropospheric propagation modeling, and CDMA spreading code correlation — and the practical engineering required to implement real-world satellite communication subsystems. This position sits at the intersection of satellite communications engineering, precision time and frequency, and advanced signal processing. The engineer will own the GNSS subsystem architecture end-to-end, contribute to the TT&C subsystem, and serve as the technical authority on all matters related to satellite-based PNT service design, clock disciplining, and time transfer over wireless and optical physical mediums. Key job responsibilities The Senior GNSS Systems Engineer will serve as the technical lead and subsystem owner for the spacecraft GNSS architecture, driving all aspects of design from initial requirements definition through hardware acceptance.