Guidance, Navigation & Control; GNC) Systems Engineer

MANNARINO Systems & Software Inc. is a leader in providing safety-critical systems, software, hardware and certification engineering services to the aerospace, defense, space, simulation & power generation industries.

Our customer base is very large, covering traditional aerospace companies as well as new and exciting markets, including electric propulsion, Urban Air Mobility, Unmanned Aerial Vehicle and autonomous flight.

The MANNARINO culture is focused on high quality, hard work, professionalism and teamwork within a highly respectful, motivating atmosphere geared towards long‑term business growth.

As a member of our team, you will benefit from:

• a comprehensive group insurance and RRSP plan

• a flextime policy with paid overtime

• discretionary bonuses

• a fitness reimbursement program

• other office perks such as catered weekly lunches and free hot beverages (espresso, coffee, hot chocolate and tea)

• regular company outings

We are seeking a GNC
System Engineer for design, integration, verification, and operational support of GNC subsystems for our current and next‑generation remote sensing and communications satellites. The role will require to design the complete subsystem, from algorithm development through hardware implementation, verification, and on‑orbit operation support. The role requires deep expertise in orbital dynamics, attitude‑determination & control, plus real‑time FSW definition and integration, and will work closely with subsystem and mission operations teams throughout the satellite life‑cycle.

• Derive GNC functional, performance, and safety requirements (pointing accuracy, slew rate, orbit‑maintenance ΔV, fault‑tolerance) from mission level requirements.
• Produce System Requirements, Interface Control document (ICD), and Description Document.
• Perform requirement management and maintain bidirectional traceability throughout the project lifecycle.

• Conduct trade studies on sensor suites and actuator families.
• Perform high‑fidelity dynamics simulations (Matlab/Simulink, STK) to meet pointing requirements, maintain error budgets, control‑law stability, fuel consumption, and survivability margins.

• Design and implement attitude‑determination algorithms and orbit‑determination solutions.
• Develop control laws for 3‑axis stabilization, slew maneuvers, station keeping algorithms
• Validate algorithms with Monte‑Carlo analysis, worst‑case scenarios, and support SIL/HIL testing on avionic test bench.

• Translate algorithms into FSW requirements running on real‑time operating systems.
• Collaborate with the C&DH and FSW teams to implement TM/TC, schedulers and FDIR logic for GNC.
• Present technical status, risk analyses, and trade‑study results to senior management.
• Negotiate and maintain ICDs with subsystems.
• Support B&P (Phase 0 & pre-phase
  
  A).

• Specify sensor and actuator hardware, perform interface definition (electrical, mechanical, thermal) and conduct trade on redundancy architectures.
• Work with structures and thermal engineers to ensure proper mounting, thermal paths, and vibration survivability of GNC hardware aligning with payload requirements.
• Review harness routing and power distribution for GNC electronics.

• Author Verification Plans, Test Matrices, and Validation Procedures for unit, subsystem, and spacecraft level GNC tests.
• Lead functional tests: sensor calibration, actuator command‑response, closed‑loop attitude‑control on testbeds, and on‑orbit checkout sequences.
• Conduct failure mode and effects analysis (FMEA), fault tree analysis…