Sentinel Principal​/Sr Principal Software Integration Engineer

Principal / Sr. Principal Software Integration Engineer

Location:

Huntsville, AL or Roy, UT.

Relocation assistance may be available.

Travel required:

Yes, 10% of the time. Clearance required at start:
Yes, Secret.

• Python proficiency – writing clean, testable code; familiarity with virtual environments, packaging, and type hints.
• Embedded/hardware interfaces – UART, SPI, I²C, CAN, USB, JTAG, GPIO, PWM, ADC/DAC.
• Real‑time operating systems (RTOS) or bare‑metal development basics.
• Hardware description/validation tools – oscilloscopes, logic analyzers, multimeters, power supplies, test rigs.
• Firmware build systems – Make, CMake for cross‑compilation.
• Version control – Git (branching, sub‑modules, pull‑request workflow).
• CI/CD for embedded – Jenkins, Git Hub Actions, Git Lab CI with hardware‑in‑the‑loop (HIL) runners.

• Designing and implementing drivers/APIs that expose hardware functionality to Python.
• Using communication protocols (Modbus, MQTT, OPC?
  
  UA) to bridge software services and devices.
• Managing bootloaders, firmware upgrades, and configuration flashing.

• Unit/Component testing – pytest, unittest, hypothesis for pure‑Python modules.
• Hardware‑in‑the‑loop (HIL) testing – automated scripts that program devices, run stimulus, capture response, and assert results.
• System‑level testing – Robot Framework, Test Stand, or custom Python harnesses that coordinate multiple subsystems.
• Automated measurement – pyvisa / pyserial to drive test equipment and log data.
• Coverage & static analysis – coverage.py, pylint, mypy.

• Containerizing test environments (Docker) for simulation and host‑side tools.
• Managing artifact repositories for firmware binaries (Artifactory, Nexus).
• Using over‑the‑air (OTA) or in‑field update pipelines.

• Agile/Scrum or Kanban for cross‑functional teams.
• Familiarity with the V‑model or ISO:26262‑style verification flows in safety‑critical domains.

• Strong analytical debugging – ability to trace issues from software logs down to signal integrity on a PCB.
• Clear communication with electrical engineers, firmware developers, and QA testers.
• Documentation discipline – hardware interface specs, test procedures, and release notes.

• Medical, Dental & Vision coverage.
• 401(k).
• Educational Assistance.
• Life Insurance.
• Employee Assistance Programs & Work/Life Solutions.
• Paid Time Off;
  Health & Wellness Resources.
• Employee Discounts.

Standard work schedule: 9/80.

• 5 years with bachelor’s in related field (Principal), 3 years with master’s, 1 year with PhD or 4 additional years in lieu of a degree; 8/6/4 years for Senior Principal.
• U.S. citizenship with active DoD Secret clearance;
  Able to obtain Special Program Access (SAP).
• Experience planning, executing, and managing technical scope; supporting leadership planning.
• Agile experience in cross‑function Scrum team.
• Working knowledge of object‑oriented analysis and design principles.
• Experience developing complex software solutions using C++ and scripting languages (Python, Bash).
• Familiarity with model‑based systems engineering languages (SysML/UML) and concepts.
• Experience interpreting complex algorithms and requirements for implementation.

• Bachelor’s degree or higher in STEM.
• Experience with Atlassian Tool Suite (Jira, Confluence).
• Proficient with DOORS, Cameo; writing and decomposing system requirements.
• Ability to evaluate risks and tradeoffs and present solution options to management.

Primary Level: $98,400.00 – $.

Secondary Level: $ – $.

Salary determined by scope, responsibilities, experience, education, skills and market conditions. Dependent on overtime, shift differential, bonus eligibility, Long‑Term Incentives for senior roles.

Northrop Grumman is an Equal Opportunity Employer. For a complete EEO and pay transparency statement, see

U.S. Citizenship is required for all positions with a government clearance and certain other restricted positions.