Principal Software Engineer; Onsite

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

• Collaborate with cross‑functional, agile teams to define, design, and implement new features, ensuring system integration and scalability.
• Troubleshoot, debug, and optimize existing code for performance and efficiency in complex environments.
• Write and maintain comprehensive documentation for software applications, including system architecture and design specifications.
• Participate in product reviews and ensure adherence to engineering standards and best practices.
• Stay current with industry trends and advancements in modern languages, Artificial Intelligence (AI), Dev Sec Ops , and other methodologies and technologies, especially in relation to complex systems.
• Exhibit leadership behaviors and practices and serve (part‑time or full‑time) in leadership roles.
• Travel and off‑hours testing (2nd or 3rd shift) may occasionally be required.

• Agile methodology and the associated tools.
• Leadership tools associated with Proposal efforts and Earned Value (EV).
• Modern Dev Sec Ops  and Continuous Integration/Continuous Delivery techniques.
• Test‑Driven Multi‑Disciplined Capability (TDMC) Product Development methodology.
• Domain knowledge such as battle management, command & control, communications, radar, missile, and/or modeling & simulation.
• Use of AI to increase efficiency across the SDLC.

• Minimum of a bachelor’s degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of experience.
• Experience leading a small team (estimating effort, decomposing tasks, tracking and reporting progress).
• Experience developing complex systems and applications using an object‑oriented programming language, particularly C++.
• Experience in a Unix/Linux operating system.
• Experience with data structures, software design principles, and coding algorithms, especially in high‑concurrency and distributed systems.
• Experience with embedded systems, real‑time systems, or large‑scale applications.
• Experience with multithreading, memory management, and performance optimization in complex environments.
• Experience with Shell Scripting (tcsh, csh, bash), software development tools such as Git/Clearcase, and software debuggers.
• Experience with software development methodologies (Agile, Scrum, etc.).

• Active Secret security clearance.
• Experience as a Scrum Master (SM) and/or a Product Owner (PO).
• Experience with Network Communication Protocols and embedded Real‑Time Operating Systems (RTOS), such as VxWorks and Integrity.
• Experience in object‑oriented languages such as Java, C#, and Ada.
• Competency with Red Hat Enterprise Linux Operating System.

U.S. citizenship is required. Active or interim U.S. government‑issued Secret security clearance is required prior to start. The candidate must have the ability to obtain and maintain this clearance.

Salary range: $107,500 – $204,500 USD. Benefits may include medical, dental, vision, life insurance, short‑term and 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. Additional annual short‑term and/or long‑term incentive compensation programs may apply depending on level and collective‑bargaining status.

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, veteran status, or any other applicable state or federal protected class.