Sr Principal Software Engineer -Core Systems & Libraries (Onsite) (Huntsville)

Position Overview

Design the Foundation of Next-Generation Avionics. Join the growing Collins Aerospace Core Systems and Libraries team and play a key role in shaping the software foundation that powers modern aircraft. We are seeking a Senior Principal Software Engineer who thrives on solving complex technical challenges and driving high‑impact solutions across safety‑critical systems.

What You Will Do

• Lead the architecture and design of core software components, libraries, and tooling aligned to avionics system requirements
• Drive technical direction and execution across development and verification activities for safety‑critical software (DO‑178)
• Define and manage software requirements, decomposition, and traceability across complex systems
• Develop and verify software using modern C++ and object‑oriented design principles
• Own and produce DO‑178 certification artifacts, including DAL‑A deliverables
• Lead and support certification efforts, including engagement with customers and regulatory authorities
• Conduct and contribute to peer reviews to ensure quality, consistency, and compliance across the lifecycle
• Collaborate cross‑functionally with engineering, program leadership, and customers to align technical solutions with program objectives
• Willing and able to travel as required (domestic and international <10%)

What You Will Learn

• Gain hands‑on experience with cutting‑edge and emerging technologies that are shaping the future of avionics and aerospace systems
• Build end‑to‑end expertise across the full product lifecycle, from requirements and design through verification and delivery of safety‑critical systems
• Develop a deep understanding of software certification (DO‑178) and how world‑class avionics products meet rigorous regulatory standards
• Learn how to design, scale, and sustain software product lines that support a wide range of platforms and global customers

You Must Have

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and minimum 10 years prior relevant experience or an Advanced Degree in a related field and minimum 7 years of experience
• U.S. citizenship is required, as only U.S. citizens are authorized to access information under this program/contract
• Proven experience designing and developing software architecture, libraries, or platform‑level components within an aerospace or safety‑critical environment
• Demonstrated ability to lead technical execution of projects, including customer engagement and presenting to senior stakeholders
• Hands‑on experience supporting DO‑178 software development and certification activities (e.g., requirements, verification, or certification artifacts)
• Experience working across cross‑functional engineering and program teams to deliver complex, integrated solutions

Preferred Qualifications

• Experience with C++ and VxWorks
• Experience writing High‑Level and Low‑Level Requirements
• Experience writing Test Cases and Automated Test Procedures
• Experience with Civil Certification DO‑178 – DAL A preferred
• Experience with design and development of Flight Management Systems, Software, Aircraft Applications or Middleware
• Familiar with revision control concepts and tools (e.g. GIT, Subversion, JIRA)

Benefits

• 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 illness insurance, group legal, ID theft protection
• Birth, adoption, parental leave benefits Ovia 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 And more!

Salary Range

132,400 USD - 251,600 USD.

EEO Statement

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. Privacy Policy and Terms: Click on this link to read the Policy and Terms