Principal Systems Engineer Onsite

Position Overview

Principal Systems Engineer – Onsite, located in Largo, FL (USA). Requires U.S. citizenship and an active DoD Secret security clearance on day one, with the ability to obtain Top‑Secret.

• Organize and lead the development of full‑life‑cycle solutions from CONOPS to validation.
• Collaborate with customers, subcontractors, and executive leadership.
• Guide the development of new technologies to support business capture.
• Identify technology gaps in existing systems and solutions.
• Own the preparation, cost, and schedule of design reviews and testing phases.
• Influence decision makers with recommended courses of action on complex problems.
• Review and document major changes to systems or processes to solve complex problems.

• Lead multidisciplinary teams of design professionals (Electrical, Mechanical, Software, Test, Logistics, Systems).
• At least three of the following areas:
  Systems Engineering, Test Engineering, Software Engineering, Mechanical Engineering, Electrical Engineering.
• Experience across Systems Engineering V with emphasis on development, integration, and test.
• Experience working with Secure Voice and VTC communication systems.
• Minimum 8 years of relevant experience with a STEM degree, or 5 years with an advanced degree.
• Active and transferable Secret clearance, with ability to obtain Top‑Secret.
• U.S. citizenship required for clearance.

• Familiarity with embedded systems, microcontrollers, and communication protocols (e.g., I²C, SPI, UART).
• Experience with voice communication systems (VoIP, SIP, RTP, SRTP).
• Familiarity with multicast networking (e.g., IGMP, PIM).
• Understanding of networking principles (TCP/IP, UDP, Wireshark).
• Basic firmware (VHDL) or software development (C/C++, Python).
• Knowledge of military specifications (MIL‑STD‑810, MIL‑STD‑461).
• Proficiency with system design tools (MATLAB, Simulink).
• Experience leading discussions with customers and vendors/subcontractors.
• Current active Top‑Secret clearance.

• Medical, dental, vision insurance.
• Three weeks of vacation for new hires.
• Generous 401(k) plan with employer match and Lifetime Income Strategy option.
• Tuition reimbursement program.
• Student loan repayment program.
• Life and disability coverage.
• Optional additional coverages (pet, home & auto, etc.).
• Birth, adoption, and parental leave benefits.
• Health and wellness programs (office incentives, virtual doctor visits, etc.).

Salary range: $107,500 – $204,500 USD, based on experience, education, and skills.

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 protected class.