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Principal Software Engineer

RTX


Job Location:

El Segundo, CA - USA

Yearly Salary: USD 118300 - 224900
Posted: 24 September 2026 (9 hours ago)
Application Deadline: 22 December 2026
Vacancies: 1 Vacancy

Job Summary

Date Posted:

Country:

United States of America

Location:

US-CA-EL SEGUNDO-E01 2000 E El Segundo Blvd BLDG E01

Position Role Type:

Onsite

U.S. Citizen U.S. Person or Immigration Status Requirements:

Active and transferable U.S. government issued security clearance is required prior to start date. U.S. citizenship is required as only U.S. citizens are eligible for a security clearance

Security Clearance Type:

DoD Clearance: Secret

Security Clearance Status:

Active and existing security clearance required on day 1



At Raytheon the foundation of everything we do is rooted in our values and a higher calling to help our nation and allies defend freedoms and deter bring the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of todays mission and stay ahead of tomorrows team solves tough meaningful problems that create a safer more secure world.



We are looking for a skilled Principal Software Engineer with embedded development experience to join our team in El Segundo CA.



What You Will Do:

  • Serve as a senior technical leader responsible for architecting developing integrating and verifying highreliability embedded and realtime software for advanced aerospace and defense systems. You will provide expert-level guidance across the software lifecycle influence system architecture decisions coordinate with hardware and systems teams and drive technical execution with a high degree of autonomy.
  • In this role you will shape technical solutions for time-critical systems mentor engineers lead design reviews and ensure that delivered software meets performance scalability cybersecurity and safety requirements. You will also help guide long-term program strategy in collaboration with cross-functional engineering and program leadership.

Key Responsibilities:

  • Provide technical ownership for major embedded software capabilities leading design implementation integration and verification activities.
  • Break down complex technical problems identify solution paths and guide teams through execution with minimal oversight.
  • Specify and design scalable maintainable secure software architectures ensuring alignment with Cybersecurity Software Safety and systemlevel requirements.
  • Develop optimize and debug real-time software using FreeRTOS Zephyr VxWorks or similar RTOS environments including scheduling semaphores queues drivers and kernel/user space interactions.
  • Implement embedded software in C and C with additional contributions in Python or assembly when required for low-level tasks automation or hardware bring-up.
  • Lead system bringup and integration efforts on ARM-based processor platforms including peripheral configuration and hardware-software interface alignment.
  • Develop clear complete technical documentation including specifications ICDs architecture diagrams test plans verification reports and user documentation following Raytheon engineering processes.
  • Drive testing and validation strategy across unit integration hardware-in-the-loop and full system-level evaluations.
  • Apply rigorous SDLC practices ensuring consistency across planning design coding testing deployment and sustainment.
  • Lead Agile/Scrum activities refine requirements manage backlogs and coordinate cross-functional execution.
  • Support DevOps and CI/CD adoption including build automation pipeline integration continuous testing and infrastructure-as-code workflows using GitLab.
  • Perform advanced embedded debugging employing modern tools methodologies and ARM-specific workflows for fault isolation and resolution.
  • Collaborate with hardware systems IV&V cybersecurity and program leadership to resolve issues and ensure seamless integration across the system lifecycle.
  • Use MagicDraw GitLab and other engineering tools to support configuration management modeling and systems traceability.


Qualifications You Must Have:

  • Typically requires a Bachelors degree in Science Technology Engineering or Mathematics (STEM) and 8 years of relevant software experience.
  • Experience in C and C including embedded and real-time development.
  • Experience with RTOS (FreeRTOS Zephyr VxWorks) including scheduling drivers task management semaphores and queues.
  • Experience using GitLab for version control CI/CD or DevOps.
  • Active and transferable U.S. Government issued Secret clearance is required prior to start date.U.S. citizenshipis required as only U.S. citizens are eligible for a security clearance.



Qualifications We Prefer:


  • Experience developing software for ARM processors including peripherals and low-level hardware interfaces.
    Experience applying SDLC across multiple software phases.
    Experience with Agile/Scrum processes.
  • Experience designing software architecture for high-performance safetycritical or securitycritical systems.
  • Experience with Python or assembly for embedded functionality test automation or hardware initialization.
  • Experience generating or reviewing technical documentation: ICDs requirements architecture specs or test plans.
  • Experience with MagicDraw or model-based systems engineering tools.
  • Experience developing automated test pipelines or DevOps workflows for embedded systems.
  • Experience coordinating across hardware systems and cybersecurity teams including customer-facing technical discussions.
  • Strong communication leadership mentoring and technical review abilities.



What We Offer:

Our values drive our actions behaviors and performance with a vision for a safer more connected world. At RTX we value: Trust Respect Accountability Collaboration and Innovation. Some of our employee benefits include:

  • The RTX Employee Scholar Program pays for tuition academic fees and books for undergraduate and graduate study at approved educational institutions
  • 401(k) plan that offers a broad range of investment options. For eligible employees we will match up to 4% of your savings to help you build financial security
  • Flexible work schedules and paid time off to accommodate work/life balance including many with every other Friday off

Learn More & Apply Now!


Please consider the following role type definition as you apply for this role.

  • Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees as they are essential to the development of our products.

Required Experience:

Staff IC


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