Senior Principal Software Security Engineer

globalhr; Tucson (AZ); On-site; USD 132,000 - 252,000; Full time

Benefits offered by this job

Parental leave

Flexible work schedules

Educational assistance

Job summary

RTX is hiring for a Senior Principal Software Security Engineer in Tucson, AZ. The role focuses on delivering world-class security software for deployed missile systems, requiring deep expertise in real-time design and embedded platforms.

You will work with C/C++ on various computing platforms, interface with customers, and collaborate with the Systems Security Engineering team to ensure program maturity and security compliance throughout development lifecycle.

Qualifications

• Bachelor’s degree in STEM with a minimum of 10 years of relevant software experience.
• Experience with C/C++ in real-time embedded software environments.
• Knowledge of embedded processors and secure software practices.

Responsibilities

• Design, develop, integrate and test real-time missile software.
• Apply system security principles to missile software architectures.
• Collaborate with Systems Security Engineering to define and implement requirements.

Education

Bachelor’s degree in STEM

Tools

C/C++

Xilinx MPSoC/Versal

VxWorks

Embedded Linux

Python

Perl

Job description

Date Posted: 2026-05-26

Country: United States of America

Location: US-AZ-TUCSON-801 ~ 1151 E Hermans Rd ~ BLDG 801 (External Site)

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: Ability to obtain INTERIM U.S. government issued security clearance is required prior to start date

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world.

Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.

Software Security Sensors and Effectors (S3E) Department is looking to hire a Sr Principal Software Security Engineer in Tucson, AZ.

• Raytheon Tucson, AZ Location
• Our Culture | RTX Careers

What You Will Do:

Our mission is to provide world class Security Software to be used in deployed missile systems.

• This position requires understanding of real-time software design and the performance implications associated with specific System Security implementations.
• Involve with application and embedded software design, development, integration, and testing of real-time missile software.
• Apply System Security principles to the design and implementation of Missile software applications.
• Develop software applications using C and C++ languages on a variety of computing platforms
• Understand real-time software design and the performance implications associated with specific System Security implementations.
• Able to understand how position's efforts affect the “big picture” of the missile system and be able to develop or review detail solutions at the source code level.
• Work closely with the Systems Security Engineering team to define and implement requirements.
• Work in a common development environment to support and facilitate program ability to leverage specific capabilities.
• Interface with customer community to review technical design and support verification of system maturity.

Qualifications You Must Have:

• Typically requires a Bachelor’s in Science, Technology, Engineering, or Mathematics (STEM) AND a minimum of 10 years of relevant software experience
• Experience with C / C++
• Experience with Xilinx UltaScale+ MPSoC, Versal, or similar Embedded Processors
• Experience with embedded OS like VxWorks, Embedded Linux, or similar
• Embedded Software Security experience
• The ability to obtain and maintain an Interim Secret Level U.S. security clearance is required prior to start date with the ability to obtain program access after start . U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Qualifications We Prefer:

• Experience with validation and verification of software applications
• Experience/Knowledge of any of the following:
• Linux/Unix environment
• Interfacing with FPGAs
• Interfacing with low-level memory drivers
• Inter-processor communication
• ARM Architecture
• Secure boot concepts
• Crypto graphic Algorithms
• Experience designing, implementing, testing, or fielding real-time security-oriented solutions on Department of Defense (DoD) programs (embedded experience highly preferred)
• Experience using security-relevant tools and devices for security auditing, network security, host/server security, communication security, or policy management.
• Experience in Agile and DevSecOps environments
• Experience in an Agile/Scrum/Kanban frameworks and development environments
• Experience using software configuration management and bug tracking tools
• Experience with Python / Perl
• Knowledge of modern computer architectures and hardware technologies including:
• PCIe, GPIO, I2C, SATA
• Field Programmable Gate Arrays (FPGAs)
• Application-Specific Integrated Circuits (ASICs)

What We Offer:

• Whether you’re just starting out on your career journey or are an experienced professional, we offer a robust total rewards package with compensation; healthcare, wellness, retirement and work/life benefits; career development and recognition programs.
• Some of the benefits we offer include parental (including paternal) leave, flexible work schedules, achievement awards, educational assistance and child/adult backup care.
• \"Tucson is Awesome\": https://www.youtube.com/watch?v=i65wOwKcNIQ
• \"Winter in Tucson\": https://www.youtube.com/watch?v=yZdKKkF0QkE

Location Information:

This position is onsite at our campus in beautiful Tucson, AZ. Tucson has a friendly, caring, and laid-back atmosphere, combined with the innovation and energy of a metropolitan region, and recognized as one of America’s 10 Best Small Cities. Surrounded by beautiful mountains, colorful Sonoran Desert landscape and majestic saguaro cacti, Tucson is blessed with some of nature’s best work. Tucson is known for its bright blue skies, and with more than 310 sunny days per year, Tucson’s fantastic weather lets residents enjoy the outdoors year-round.

As part of our commitment to maintaining a secure hiring process, candidates may be asked to attendselect steps of the interview process in‑person at one of our office locations, regardless of whether the role is designated as on‑site, hybrid or remote.

The salary range for this role is 132,400 USD - 251,600 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability,