Principal Software Engineer

RTX

Largo (FL)

On-site

USD 108,000 - 205,000

Full time

2 days ago

Be an early applicant

A complete application in a minute

Tailored resume and cover letter, ready to send.

Get past ATS filters

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

Paid vacation

401(k) match

Tuition assistance

Life insurance

Disability coverage

Job summary

RTX, a leading aerospace and defense company, seeks a Principal Software Engineer for its Strategic Communication Software Engineering Department in Largo, FL. The role requires a current Secret DoD clearance and is onsite, offering a comprehensive benefits package and competitive salary.

Responsibilities include full lifecycle software development, collaboration with cross-disciplinary teams, and adherence to advanced software engineering processes.

Qualifications

Active DoD secret clearance required prior to start date.
U.S. citizenship required for security clearance eligibility.
Experience across the software development lifecycle (SDLC).
Experience with C++ in software development.
Experience with RTOS and embedded programming.
Ability to work in a cross-functional team with other disciplines.

Responsibilities

Participate in cross-disciplinary, collaborative product teams using agile methods.
Own full software lifecycle from architecture and design to integration and field support.
Work toward high maturity software processes as recognized by SEI.
This is a full-time on-site position in Largo, FL.

Skills

C++ programming

RTOS

Embedded software

Team collaboration

Communication

Education

STEM degree

Advanced degree preferred

Tools

Jenkins

DevOps

Python scripting

Containerization

Job description

Job Details

Date Posted: 2026-11-02 Country: United States of America Location: US-FL-LARGO-382ST ~ 7887 Bryan Dairy Rd ~ BLDG 400 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: Secret - Current Security Clearance Status: Active and existing security clearance required on 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. Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense. Raytheon Company, Managed by Collins Aerospace Collins Aerospace, an RTX company, is a leader in engineering and proposal teams to successfully execute programs and prepare responsive proposals aimed at making the world a safer place. Come support those who provide us with all the freedoms we enjoy. Our commitment to providing an environment that supports innovation, teamwork, and growth opportunities are primary reasons engineers come to work at RTX. The Strategic Communication Software (SW) Engineering Department has an opportunity for a talented Principal Software Engineer to join our team. This position will be onsite in Largo Florida and requires a current secret DoD clearance

What You Will Do

Participate in collaborative, cross-disciplined integrated product teams, often employing agile software development techniques
Responsible for the full lifecycle of product development, from architecture and design, through integration, test, and field support
Work and learn the highest software engineering process maturity level as recognized by the Software Engineering Institute
Full-time on-site position

Qualifications You Must Have

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
Experience in Software Engineering to include experience working various phases of the software development lifecycle
Experience with Software Development Using C++
Experience with real-time operating systems (RTOS), embedded programming, processor/board architecture and design
Experience working in a collaborative team environment that requires communication with other engineering disciplines, Program, and external stakeholders
Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 8 years prior relevant experience or an Advanced Degree in a related field and minimum 5 years of experience

Qualifications We Prefer

Applied experience in Unified Modeling Language (UML) and Object-Oriented Analysis and Design (OOA/D)
Understanding standard system engineering design artifacts such as Use Cases and SysML diagrams.
Experience with Agile lifecycle process including Scrum, Continuous Integration, and Test-Driven Development Methodologies
Experience with DevOps, Jenkins and automated testing
Experience with Model Driven Development (MDD)
Experience with software integration on custom hardware FPGA interfaces (memory mapped and SW/FW messaging) experience
Working experience with Microservice Architectures and Containerized Applications
Performance optimization experience
Exposure to CORBA messaging
Experience with TCP/IP, UDP/IP messaging, and client/server architecture
Scripting language (e.g. Python)

Salary

The salary range for this role is 107,500 USD - 204,500 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. 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.

What We Offer

Medical, dental, and vision insurance
Three weeks of vacation for newly hired employees
Generous 401(k) plan that includes employer matching funds and separate employer retirement contribution, including a Lifetime Income Strategy option
Tuition reimbursement program
Student Loan Repayment Program
Life insurance and disability coverage
Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance,critical illnessinsurance, group legal, ID theft protection
Birth, adoption, parental leave benefits
Health, fertility, and family planning
Adoption Assistance
Autism Benefit
Employee Assistance Plan, including up to 10 free counseling sessions
Healthy You Incentives, wellness rewards program
Doctor on Demand, virtual doctor visits
Bright Horizons, child and elder care services Teladoc Medical Experts, second opinion program Eligible for relocation And more!

About Collins Aerospace

At Collins Aerospace, our Mission Systems team helps civilian, military and government customers complete their most complex missions — whatever and wherever they may be. Our customers depend on us for intelligent and secure communications, missionized systems for specialized aircraft and spacecraft and collaborative space solutions. By joining our team, you’ll have your own critical part to play in ensuring our customers succeed today while anticipating their needs for tomorrow.

Interview Process

As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.

Equal Opportunity

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 or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.