Sr Principal Real-time Software Engineer

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

Benefits offered by this job

Medical

Dental

Vision

401(k) match

Job summary

RTX in Tucson, AZ seeks an experienced embedded software engineer to architect, design, and implement real-time software for heterogeneous hardware and firmware systems. You will join cross-disciplinary teams to refine concepts, improve testability, and ensure quality while mentoring junior engineers.

Applicants should have a STEM degree with extensive embedded C++ experience, proficiency in RTOS and device drivers, and the ability to obtain interim security clearance.

Qualifications

• Degree in Science, Technology, Engineering or Mathematics (STEM).
• Experience with embedded real-time software in hardware/firmware systems.
• Ability to obtain interim and full security clearance.

Responsibilities

• Architect, design, implement, test and debug embedded real-time software in heterogeneous systems.
• Collaborate with cross-functional team to define concepts, improve quality and testability.
• Mentor less experienced staff and contribute to design reviews.

Skills

Embedded C++ Software

Embedded Software Security

Software Architecture Design

RTOS experience

Hardware-software integration

Lab instrumentation

Device drivers

Team leadership

Education

STEM degree

Tools

VxWorks

Green Hills

Linux

Verilog/VHDL

Job description

Date Posted: 2026-08-17 Country: United States of America Location: US-AZ-TUCSON-805 ~ 1151 E Hermans Rd ~ BLDG 805 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 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.

The Software organization develops software applications, including integration and test on missiles, launchers, radars, naval systems, fire control and other complex systems. Our precision software and firmware integrate operating systems, device drivers, networking, and control software to bring together sensor, guidance, and flight control processing features to complete the mission. The Software org is made up of several Centers located across the country, responsible for all aspects of the software development lifecycle. Our 4000+ software engineers design, develop, and build innovative solutions for our customers. Join our fast-paced agile teams on the leading edge of technology.

As part of the Software Engineering Directorate’s (SWE) Effectors Center (EC) team, you will be an integral part of helping Raytheon further our vision to be the global leader in core and next-generation weapon and security solutions. By any measure, Raytheon is an exciting and rewarding place to work. We pride ourselves on developing mission-driven, world-class talent. The result is a workforce that takes pride in the company and consistently delivers superior solutions.

What You Will Do

• Architecting, designing, implementing, testing, and debugging integrated embedded real-time software within heterogenous systems composed of firmware and hardware.
• Working within a cross-discipline team to define, refine, and improve product concept, implementation, testability, and guaranteed, measurable quality.
• Teaching, coaching, and mentoring less experienced staff.
• Contributing to proposals as well as preliminary and critical design reviews.
• Ability to obtain program access.

What You Will Learn

Working across a product line in collaboration with other teams.

Qualifications

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience.
• Experience including at least two of the following: Embedded C++ Software, Embedded Software Security, Software Architecture Design and Implementation.
• Experience using embedded Real Time Operating Systems (RTOS) (e.g., Green Hills, Integrity, Wind River VxWorks, Linux, etc.).
• Experience developing complex systems involving the integration of hardware, firmware, and software.
• Ability to obtain Interim Secret Level U.S. government issued 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.
• We Prefer Familiarity with rate monotonic theory, practice, and limitations.
• Familiarity with layered architectural principles, and their limitations.
• Familiarity with reading electrical schematics and relating it to software function.
• Familiarity with reading firmware source like VHDL or Verilog.
• Familiarity with assembly language in at least one processor/controller family.
• Experience using lab instruments like power-supplies, digital multi-meters, oscilloscopes, and logic analyzers.
• Experience with developing device drivers for bare-metal and/or OS applications.
• Experience leading engineering teams in delivering systems (of various size) involving the integration of hardware and software.

What We Offer

Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Safety, Trust, Respect, Accountability, Collaboration, and Innovation.

Relocation Offered Based On Eligibility

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.

Virtual Fly Over City of Tucson & Community, YouTube Video Links “Raytheon In Tucson”: https://careers.rtx.com/global/en/raytheon-tucson,-az-location “Tucson is Awesome”: https://www.youtube.com/watch?v=i65wOwKcNIQ “Winter in Tucson”: https://www.youtube.com/watch?v=yZdKKkF0QkE #TucsonSoftware

As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select 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.

Salary and Compensation

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.

• medical
• dental
• vision
• life insurance
• short-term disability
• long-term disability
• 401(k) match
• flexible spending accounts
• flexible work schedules
• employee assistance program
• Employee Scholar Program
• parental leave
• paid time off
• holidays

Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement.

Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance.

This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply.

RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

Equal Opportunity Employer

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

Company Overview

RTX is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry-leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon. Its 195,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, Virginia.