Principal Software Engineer (Onsite)

RTX (Raytheon); Middletown (RI); On-site; USD 140,000 - 190,000; Full time

Job summary

RTX BBN Technologies in Rhode Island near Newport seeks a Principal Software Engineer specializing in real-time embedded C development. You will design, develop, and integrate high-performance embedded software on multi-threaded platforms and work with hardware interfaces for DoD systems.

Qualifications include a STEM degree and 8+ years of experience, active DoD Secret clearance on day one, and proficiency with RTOS such as VxWorks, Green Hills, or Linux. Travel up to 15% may be required.

Qualifications

• Typically requires a STEM degree and 8+ years of experience.
• Active and transferable Secret U.S. Government Security Clearance on day one.
• Experience in at least two: Embedded C/C++ software, HPC systems, embedded RT sensors & control apps, software architecture design.
• Experience using embedded RTOS (Green Hills, Integrity, Wind River VxWorks, Linux, etc.)
• Experience integrating hardware, firmware and software in complex systems.

Responsibilities

• Design, develop, implement, test, debug and integrate high performance embedded real-time software within heterogeneous systems with FPGA interfaces.
• Collaborate with a cross-functional team testing contributions and analyzing performance.
• Integrate components into a larger system in preparation for real world testing and deployment.
• Teaching, coaching, and mentoring less experienced staff.
• Contributing to proposals and design reviews.
• Travel required up to 15%.

Skills

Embedded C/C++

RTOS

Linux

VxWorks

Software architecture

High-performance computing

Signal processing concepts

Education

STEM degree

Tools

Green Hills

Integrity

Wind River VxWorks

Linux

VSIPL

MATLAB

Job description

Date Posted: 2026-09-16

Country: United States of America

Location: US-RI-MIDDLETOWN-201 ~ 127 John Clarke Rd ~ BBN MIDDLETOWN, Ste 3

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

RTX Corporation 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 185,000 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, VA.

RTX BBN Technologies is an organization which values work/life balance and encourages lifelong learning of new technologies. For over 70 years, scientists and engineers in diverse disciplines at RTX BBN Technologies have collaborated to solve real-world problems through research, exploration, development and prototyping. We challenge the status quo, pioneer new technologies, and create transformative solutions.

We are seeking a Principal Software Engineer with experience in real-time embedded C language system development to join our Physical Sciences & Systems business unit located a stone's throw from seaside Newport, Rhode Island. Responsibilities will include but are not limited to: Linux and VxWorks real-time software development on a wide range of embedded multi-threaded platforms, integrating with custom hardware, implementation of high-performance embedded solutions, middleware, and implementing control, detection, and tracking algorithms developed by the systems engineering team.

What You Will Do

• Design, develop, implement, test, debug and integrate high performance embedded real-time software within heterogenous systems composed of multiple processor types and FPGAs, with external sensor and control interfaces for deployed DoD real-time software systems hosted on embedded hardware.
• Collaborate with a cross-functional team testing your contributions and analyzing performance.
• Integrate components you develop into a larger system in preparation for real world testing and deployment.
• Teaching, coaching, and mentoring less experienced staff.
• Contributing to proposals as well as preliminary and critical design reviews.
• Travel required up to 15%

What You Will Learn

• Involvement in the technical components of solving our customer's most complex problems.
• Work with world-class researchers and engineers who embrace innovation and challenge the status quo.
• Experience in a highly visible software development team, exposure to the Navy acquisition process, and opportunity to learn new technologies and gain new embedded development experiences.

Qualifications You Must Have

• Typically requires a degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of prior experience.
• Active and transferable Secret U.S. Government Security Clearance is required on day one.
• Experience including at least two of the following: Embedded C/C++ Software, High Performance Computer Systems, Embedded Real-Time Sensors and Control Applications, 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.

Qualifications We Prefer

• Ada programming language.
• Proficiency using C/C++.
• Familiarity with digital signal processing algorithms and software.
• Knowledge of linear algebra concepts.
• Experience using the VSIPL high performance vector library or another vector processing library.
• Proficiency in MATLAB and/or optimizing algorithms in C/C++.
• Experience with real-time processing optimization.

What We Offer

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