Principal Software Engineer (Mission Systems) (Onsite)

RTX (Raytheon); McKinney (TX); On-site; USD 140,000 - 195,000; Full time

Job summary

RTX in McKinney, TX, is seeking a Principal Software Engineer to design and implement embedded real-time software for radar and sensor systems. You will contribute to system-of-systems architecture and collaborate across disciplines in a DoD context.

You will work with senior architects, participate in PDR/CDR, and mentor junior engineers. This onsite role requires residency in McKinney with potential travel up to 5%.

Qualifications

• Typically requires a STEM degree and 8+ years of relevant engineering experience.
• Experience with large-scale system-of-systems architecture and interfaces.
• Proficiency with real-time software development and C++.
• Experience with modeling tools (Cameo or Enterprise Architect) and MOSA standards.

Responsibilities

• Function as a senior technical contributor who reviews work and influences policies.
• Provide systems thinking and architecture support toward PDR.
• Collaborate with senior architects in a fast-moving environment with minimal oversight.
• Drive technical clarity across sensor integrations via system-of-systems concepts.
• Communicate decisions across engineering teams, customers, and vendors.
• Architect, implement, test, and debug embedded real-time software.
• Participate in major design reviews, including PDR and CDR.
• Mentor less experienced engineers.
• Occasional travel up to 5%.

Skills

System-of-systems architecture

Subsystem interface design

Software integration and test

C++ programming

Real-time software development

Linux / RTOS (VxWorks)

Education

STEM degree

Tools

Cameo

Enterprise Architect

MS Visio

MOSA standards (OMS/AMS-GRA/A-GRA)

Job description

Date Posted: 2026-09-15

Country: United States of America

Location: US-TX-MCKINNEY-513WD ~ 2501 W University Dr ~ WING D BLDG

Position Role Type: Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. 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 after day 1

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.

The Sensors: Space and Airborne Radar Center provides end-to-end design, development, deployment, integration, and sustainment of multi-domain C2 and radar systems. The center specializes in developing Tactical Modes, Built‑In Test (BIT), and Radar Interface software for Tactical Radar Systems, as well as pioneering radar software and signal processing technologies. The center also develops advanced sensor technologies and mission support capabilities for warfighters, including electro‑optical, infrared, and electronic solutions across various platforms. Our software engineers are responsible for software architecture, design, and implementation for radar systems, signal processing, tracking, and resource management throughout the product lifecycle.

Raytheon has an opportunity for a Principal Software Engineer to join our Mission Systems Engineering Team in the DFW area. We're seeking a highly capable Software Engineer with strong systems thinking, deep software architecture experience, and domain knowledge in advanced defense or aerospace systems. This role is ideal for someone who thrives in a fast‑paced environment, collaborates across disciplines, and can drive software design at the system-of-systems level.

What You Will Do

This position is for a Principal Software Engineer who has professional experience in the development and implementation of software for real‑time applications.

Deliverables include but not limited to:

• Function as a senior technical contributor who can delegate and review work from lower level engineers and influence policies, practices, and procedures to ensure steady progress.
• Provide senior level systems thinking and architecture support (systems CONOPS, specification trees, and multi CSCI decomposition) to resolve complex issues on the path to PDR.
• Operate effectively with senior architects and technical fellows, integrating across disciplines and navigating a fast moving environment with minimal oversight.
• Leverage subject matter expertise in system of systems architecture, inter CSCI interfaces, software requirements, and SW/HW integration to drive technical clarity across a broad array of potential sensor and effector integrations.
• Utilize advanced modeling tools (Cameo/EA), MOSA standards, and multi discipline agile leadership experience to communicate technical decisions across engineering teams, customers, and vendors, and to support major design reviews.
• Architect, implement, test, and debug embedded real‑time software in heterogeneous hardware, firmware, and software environments.
• Participate in major design reviews, including PDR and CDR.
• Mentor less experienced engineers.
• Occasional business travel may be required, up to 5%.
• Onsite role in McKinney, Texas, with local residency or relocation required.

Qualifications You Must Have

Typically requires a degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of prior relevant engineering experience.

• Experience with software architecture for large scale and complex system‑of‑systems, subsystem interface design, and software integration and test.
• Experience with engineering and modeling tools (Cameo or Enterprise Architect, MS Visio) and familiarity with MOSA standards (OMS, AMS‑GRA, A‑GRA).
• Experience developing, testing, and integrating real‑time software applications using C++ or related software languages and Linux, VxWorks, or other real‑time operating systems.

Product-domain experience in at least one of the following areas:

• RF or EO/IR Sensors
• Electronic Warfare
• Effectors
• Communications
• Multi‑domain Mission Systems

The ability to obtain an