Senior Satellite Guidance, Navigation, and Control (GNC) Engineer

We are seeking a highly experienced Senior Satellite Guidance, Navigation, and Control (GNC) Engineer with significant experience in spacecraft and satellite development, including hands‑on expertise in avionics integration and mission planning. This role requires a deep understanding of control theory, sensor fusion, and high‑fidelity simulation for real‑time aerospace applications. Responsibilities Design, develop, and validate GNC algorithms with a focus on precise pointing and stability control using linear control methods. Perform high‑fidelity simulations, modeling, and analysis of guidance, navigation, and control systems. Lead avionics integration efforts, including sensor calibration, hardware‑in‑the‑loop testing, and flight software validation. Support mission planning, trajectory design, and optimization of spacecraft pointing performance. Collaborate with multidisciplinary teams, including software engineers, avionics specialists, and mission planners. Conduct system performance assessments, stability analysis, and develop risk mitigation strategies. Develop and document technical specifications, interface control documents, and system architecture designs. Provide hands‑on support for integration and testing of flight hardware and software. Collaborate with partner organizations on satellite development. Mentor junior GNC engineers. Basic Qualifications Bachelor's, Master’s, or PhD in Aerospace Engineering, Electrical Engineering, Mechanical Engineering, or a related field. Minimum of 5 years of experience in spacecraft and satellite GNC development. Expertise in precise pointing control using linear control methods. Proficiency in MATLAB, Simulink, Python, or C/C++ for simulation and algorithm development. Experience with avionics integration, including working with IMUs, star trackers, sun sensors, magnetorquers, GPS receivers, and reaction wheels. Deep understanding of spacecraft dynamics, orbital mechanics, and trajectory optimization. Experience with high‑fidelity simulation, hardware‑in‑the‑loop (HIL), and software‑in‑the‑loop (SIL) testing. Familiarity with aerospace industry standards and regulations. Strong problem‑solving skills and ability to work in a fast‑paced, collaborative environment. Preferred skills & Experience Experience with real‑time embedded software development and flight software implementation. Familiarity with Kalman filtering, guidance laws, and autonomous navigation techniques. Previous experience in mission operations and post‑launch analysis. Knowledge of spacecraft communication protocols and fault detection systems. Hands‑on experience with integration and test campaigns for space missions. Compensation & Benefits Base salary is just one part of your total rewards package at Portal. You may also be eligible for long‑term incentives in the form of company stock, stock options, or long‑term cash awards, as well as potential discretionary bonuses and the ability to purchase additional stock at a discount through an Employee Stock Purchase Plan. You will also receive access to comprehensive medical, vision, and dental coverage. Portal is planning to establish future access to a 401(k) retirement plan, short & long‑term disability insurance, life insurance, and various other discounts and perks. Employees typically have 2-3 weeks of paid vacation per year plus company holidays. ITAR Requirements To conform to U.S. Government export regulations, the applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. #J-18808-Ljbffr Insider, Inc.