Principal Software Engineer Onsite

globalhr; Huntsville (AL); On-site; USD 108,000 - 205,000; Full time

Job summary

RTX in Huntsville, AL, is seeking a Senior Software Engineer to design, develop, test, and maintain high-performance software in C++. The role focuses on Unix/Linux environments, system-level programming, and scalable architectures.

You will collaborate with product management, QA, and DevOps, conduct code reviews, and help drive Agile/Scrum practices. A DoD secret clearance is required, and travel may be requested.

Qualifications

• Requires STEM degree and 8+ years of relevant experience.
• Experience in C++ software development.
• Experience working and debugging in Unix/Linux environments.
• Ability to obtain and maintain interim secret security clearance; U.S. citizenship required.

Responsibilities

• Design, develop, test, and maintain high-performance software using C++.
• Work within Unix/Linux environments, including shell scripting and system-level programming.
• Implement scalable, maintainable software following best practices in architecture and design.
• Collaborate with cross-functional teams including product management, QA, and DevOps.
• Conduct code reviews to ensure quality and adherence to standards.
• Troubleshoot and optimize software for performance, reliability, and scalability.
• Integrate with APIs, system libraries, and hardware interfaces as needed.
• Develop and maintain technical documentation and user guides.
• Participate in Agile/Scrum development cycles and sprint planning.
• Stay current with trends in AI, DevSecOps, and modern development practices.

Skills

C++ programming

Unix/Linux debugging

Agile/Scrum

Code reviews

Education

STEM degree (Bachelor's or higher)

Tools

GDB

Valgrind

CMake

CUDA/OpenCL

MATLAB

Job description

Date Posted:

2026-08-31

Country:

United States of America

Location:

US-AL-HUNTSVILLE-401 ~ 401 Jan Davis Dr NW ~ JAN DAVIS 401

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.

As a Senior Software Engineer, you will support one or more phases of the System Development Life Cycle (SDLC) - requirements, design, development using C++, test, validation, and maintenance.

This is an onsite role based in Huntsville, AL.

What You Will Do

• Design, develop, test, and maintain high‑performance software applications using C++




• Work within Unix/Linux operating systems, including shell scripting, debugging, and system‑level programming




• Implement scalable and maintainable software solutions following best practices in architecture and design




• Collaborate with cross‑functional teams, including product management, QA, and DevOps




• Conduct code reviews and provide feedback to ensure code quality and adherence to standards




• Troubleshoot and optimize existing software for performance, reliability, and scalability




• Integrate with APIs, system libraries, and hardware interfaces as needed




• Develop and maintain documentation, including technical specifications and user guides




• Participate in Agile/Scrum development cycles, contributing to sprint planning and estimation




• Stay current with industry trends and advancements in modern languages, Artificial Intelligence (AI), Development, Security, and Operations (DevSecOps), and other methodologies and technologies, especially in relation to complex systems.




• Travel may occasionally be required.

What You Will Learn

• Agile methodology and the associated tools.




• Modern Development, Security, and Operations (DevSecOps) and Continuous Integration/Continuous Delivery techniques.




• Test-Driven Multi-Disciplined Capability (TDMC) Product Development methodology.




• Work across engineering disciplines to develop solutions to complex problems in support of defense systems.




• Use AI to increase efficiency, resulting in higher quality products, across the SDLC.

Qualifications You Must Have

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of prior relevant experience unless prohibited by local laws/regulations.




• Experience in C++ software development




• Experience working and debugging in Unix/Linux environments




• Experience with tools for use with C/C++ (GNU Project Debugger (GDB), Valgrind, etc.)




• The ability to obtain and maintain a U.S. government issued interim secret security clearance is required prior to start. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Qualifications We Prefer

• Active Secret security clearance prefer.




• Experience with MATLAB development for modeling




• Experience with network programming or inter-process communication (IPC).




• Experience with CI/CD pipelines and modern DevOps practices.




• Experience with Python or other scripting languages.




• Exposure to real-time systems, embedded software, or distributed systems.




• Experience with CMake or other Software build systems




• Experience with high-performance, real‑time software development




• Experience with parallel programming and hardware acceleration (e.g., multithreading, SIMD, CUDA/OpenCL)




• Experience with performance analysis, profiling, and optimization of computationally intensive applications

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.

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 107,500 USD - 204,500 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, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and 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.

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.

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