Embedded Firmware Engineer; C​/C++, Linux

Embedded Firmware Engineer (C/C++, Linux)

Virginia Beach, United States | Posted on 07/30/2026

GDI Infotech provides technology staffing and digital transformation solutions to MSPs, enterprise technology organizations, and institutions such as universities and government entities.

GDIInfotech, Inc.

JOB DESCRIPTION

Embedded Firmware Engineer – GNSS / Inertial Navigation Systems

Defense/ PNT R&D|Client-Confidential Engagement|U.S.Persons Only

Defense contractor — Position,Navigation & Timing (PNT) technology

Contract / Contract-to-Hire(via GDI Infotech)

U.S. Citizen required — NOFORNprogram restrictions apply

Onsite/hybrid with client;specifics confirmed at engagement

Initial deliverables duewithin 180 calendar days of requirements release, plus up to 90 days ofpost-delivery support

GDI Infotech is supporting a defense technology client thatdevelops mission-specific navigation and timing solutions for government customers. The client's PNT (Position, Navigation and Timing) Directorate isseeking embedded firmware engineers to support two related Research &Development efforts: a multi-receiver GPS/inertial navigation card (“M-REGI”)and a secure, non-“Over-The-Air” timing and ephemeris delivery system (“Secure Start”).

Candidates with strong embedded C/C++ and Linux/RTOS experience,ideally with GNSS or inertial navigation exposure, are strongly encouraged toapply.

• • M-REGI(Navigation Card): Developing embedded C/C++ firmware for acustom circuit card built around a Microchip SAM9X60 ARM processor, integratingdual GPS satellite receivers and a tactical-grade Inertial Measurement Unit(IMU).
• • Implementing Multi-Hypothesis Tracking (MHT) logic to arbitrate between two satellite-based navigation solutions usingcovariance, satellite tracking, and spoofing-detection metadata.
• •
  Secure Start (Timing/Ephemeris POC): Building aproof-of-concept, laptop-based system (Linux/Ubuntu) that generates and delivers precise satellite timing and ephemeris data to a navigation receiverwithout relying on standard over-the-air signals — reducing vulnerability tospoofing.
• • Working from orbital-parameter curve-fitalgorithms (SDP4-based), Look-Up Table generation for GPS/Galileoconstellations, and Precision Time Protocol (PTP) synchronization.
• • Customizing Linux RTOS components (U-Boot,buildroot, kernel) for real-time embedded operation using the Yocto project.
• • Building a lightweight CI/CD pipelineappropriate for an R&D environment.
• • Documenting code structure, data flow, anduser interface/configuration parameters.
• • Providing up to 90 days of post-deliveryengineering support, including troubleshooting, minor code changes, and knowledge transfer/training.

• • Strong hands-on experience developing embeddedfirmware in C/C++.
• • Experience with embedded Linux, includingkernel/buildroot customization and real-time operating system concepts (Yoctoproject experience a plus).
• • Familiarity with serial, USB, and TCP/IPcommunication interfaces on embedded platforms.
• • Ability to work from block diagrams, written specifications, and MATLAB reference scripts to implement equivalentfunctionality in firmware.
• • Comfort working in a small, fast-movingR&D environment with evolving requirements.
• • U.S. Citizenship required; ability to comply with NOFORN handling requirements (no dissemination to foreign nationals,entities, or governments).

• • Background in GNSS/GPS receiver systems,inertial navigation, or Extended Kalman Filter (EKF) implementations.
• • Experience with satellite orbital mechanics orTLE (Two-Line Element) data / SGP4-SDP4 propagation models.
• • Familiarity with Precision Time Protocol (PTP) or other precision timing/synchronization systems.
• • Experience building CI/CD pipelines for embedded or R&D software workflows.
• • Working knowledge of IEEE 730 (Software Quality Assurance Plans) or similar SQA frameworks.
• • Prior experience on defense, aerospace, orother ITAR/NOFORN-controlled programs.

GDI Infotech, Inc. is an IT staffing and recruiting firm specializing in the MSP/MSSP and technology services channel, offering directhire, contract-to-hire, contract staffing, and onsite project deployment. GDIpartners with clients to deliver qualified, vetted technical talent quickly and reliably.