Software Engineer I, Core Services and Libraries (Onsite)

RTX; Huntsville (AL); On-site; USD 57,000 - 109,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

Three weeks vacation

401(k) plan

Job summary

RTX Corporation is seeking a Software Engineer I to join the Collins Aerospace Core Systems & Libraries in Huntsville, AL. This onsite role focuses on developing core software components and DO-178 artifacts for safety-critical avionics systems.

You will work across the lifecycle with engineers and cross-functional teams to deliver certifiable software, while engaging with customers and authorities as needed. This entry-level position offers growth in a leading aerospace environment.

Qualifications

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and less than 2 years prior relevant experience.
• Experience designing and developing software architecture, libraries, or platform-level components within an aerospace or safety-critical environment.
• Experience/exposure supporting DO-178 software development and certification activities (e.g., requirements, verification, or certification artifacts).

Responsibilities

• Develop 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).
• Develop software requirements, decomposition, and traceability across complex systems.
• Develop and verify software using modern C++ and object-oriented design principles.
• Develop DO-178 certification artifacts, including DAL-A deliverables.
• Perform 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.

Skills

C++

VxWorks

Linux

Windows OS

DO-178

DAL A

GIT

JIRA

Education

STEM degree

Tools

GIT

Subversion

JIRA

Job description

Date Posted: 2026-10-20 Country: United States of America Location: US-AL-HUNTSVILLE-382 ~ 420 Jan Davis Dr ~ DAVIS 382 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: U.S. citizenship is required, as only U.S. citizens are authorized to access information under this program/contract. Security Clearance Type: None/Not Required Security Clearance Status: Not Required

At RTX, the world 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.

Join the Collins Aerospace Core Systems & Libraries team and help develop the software backbone that powers modern aircraft. We are seeking a Software Engineer I who is eager to grow, enjoys solving complex technical problems, and wants to contribute to high-impact, safety-critical aerospace systems. In this role, you will develop and support core software components, libraries, and tools that enable scalable, certifiable avionics platforms. You’ll work across the software lifecycle, collaborating with experienced engineers and cross‑functional teams to deliver high‑quality solutions aligned with civil and military certification standards. This is a strong opportunity to deepen your technical expertise, gain exposure to system‑level design, and contribute to technologies shaping the future of aerospace. This role is located onsite in Huntsville, AL.

What You Will Do

• Develop 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)
• Develop software requirements, decomposition, and traceability across complex systems
• Develop and verify software using modern C++ and object‑oriented design principles
• Develop DO‑178 certification artifacts, including DAL‑A deliverables
• Perform 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

Qualifications

Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and less than 2 years prior relevant experience. Experience designing and developing software architecture, libraries, or platform‑level components within an aerospace or safety‑critical environment. Experience/exposure supporting DO‑178 software development and certification activities (e.g., requirements, verification, or certification artifacts)

We Prefer

• Experience with C++ and VxWorks. Linux, and Windows OS Experience writing High‑Level and/or 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).

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 illness insurance, group legal, ID theft protection
• Birth, adoption, parental leave benefits
• Carrot Health to hormonal health, fertility, and family building
• 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!

This role is eligible for relocation.

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.

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.

The salary range for this role is 57,200 USD - 108,800 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 is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry‑leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon. Its 195,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, Virginia.