Senior Principal Software Engineer

What You Will Do

Investigate and implement on-prem LLM and agentic harness in a sandboxed environment.

Investigate moving the following activities to an AI agentic workflow:

• Develop real-time C++ and/or Cuda implementations of signal processing algorithms or control functions for sensor systems running on a distributed Linux backend.
• Write unit tests and integration tests to satisfy requirements.
• Analyze numerical correctness and runtime latency.
• Maintain high code quality by supporting code reviews and continuous integration.

This 1st shift role will be 100% onsite and based in Marlborough, MA.

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 10 years of prior relevant experience.
• C++ software development experience in Linux environments.
• Experience deploying on-prem LLM and agentic AI.
• The ability to obtain and maintain a U.S. government issued Secret security clearance is required.
• U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

• Experience developing GPU software - particularly with Nvidia Cuda - is highly desirable.
• Real-time software development experience.
• Experience with developer tools (Git, Cmake, Google test, gdb, profiler, Jenkins, Jira).
• Experience with scripting (Python, shell, bash).
• Experience with Agile methodologies (Scrum, Kanban).
• Radar or DSP knowledge.
• Active / Existing Secret.
• U.S. Security Clearance.

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 based on candidate eligibility.

Salary range for this role is 132,400 USD - 251,600 USD.

• 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

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.

This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard…