C5I Principal Software Engineer

Onsite position located in Tewksbury, Massachusetts. Requires U.S. citizenship and a Secret security clearance.

• Lead the design, development, testing and deployment of complex software solutions across the C5I software suite, including Linux applications, microservices, REST APIs, Windows front‑end applications, and HTML/Type Script UIs.
• Develop and implement sophisticated algorithms to solve challenging technical problems and optimize performance and functionality in mission‑critical systems.
• Analyze, implement and test software modifications to enhance functionality, performance and reliability of existing system baselines.
• Determine root cause of failures and engineer corrective solutions using advanced debugging tools.
• Provide critical insight into system‑level design, including hardware/software trade‑offs, integration of COTS solutions, software reuse opportunities and requirements synthesis from system to component level.
• Work closely with Systems Engineering, Integration & Test, and Platform teams to ensure seamless component integration and alignment of requirements.
• Recommend improvements to documentation quality and refine development process standards to enhance team efficiency and alignment.
• Provide technical guidance to the scrum team during planning and execution while mentoring junior and mid‑level engineers.
• Work under general direction, independently developing and determining approaches to complex technical solutions.

• How to design, develop and integrate multi‑language, multi‑platform C5I components spanning services, UIs and mission‑critical applications.
• Advanced techniques for developing and optimizing complex algorithms and evaluating hardware/software trade‑offs.
• Cross‑functional collaboration strategies with Systems Engineering, Integration & Test and Platform teams to ensure end‑to‑end capability delivery.
• Agile and Dev Sec Ops  best practices supporting high‑frequency, high‑quality deployment pipelines.
• Leadership and mentorship skills that foster technical growth across teams.

• Typically requires a Bachelor’s degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of relevant experience, unless local laws or regulations prohibit.
• Experience as a software developer in C++ and/or Java, including Git workflows, code reviews, unit testing, and development in Red Hat/Linux or UNIX environments.
• Experience developing software in an Agile Scrum or Kanban team environment.
• Experience using debugging tools to identify and resolve software defects and optimize performance.
• Ability to obtain a U.S. government issued Secret security clearance after the start date (U.S. citizenship required).

• Domain knowledge in Command‑and‑Control operations, including Link
  16, HMI usability, Mission Defense Planning, Simulation & Modeling and Threat Evaluation/Weapon Assignment (TEWA).
• Experience designing large‑scale, modularized, reusable product bases supporting multiple derived products.
• Proven ability to interface with customers and lead technical solutions based on complex user requirements.
• Experience with JIRA, Confluence, Git‑based workflows, CI/CD tooling, Eclipse, Ansible, Bitbucket, Artifactory.
• Familiarity with IPDS and CMMI‑compliant gate reviews.
• Experience applying AI tools to software engineering and familiarity with MBSE tools such as Cameo.
• Proven experience developing software for large, complex defense systems.
• Strong collaboration and communication skills with the ability to work under general direction while determining approaches to solutions.

Salary range: $107,500‑$204,500 USD. Eligible for medical, dental, vision, life and disability insurance, 401(k) match, flexible spending accounts, paid time off and holidays. Additional incentive programs may apply.

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 protected class. RTX provides affirmative action for qualified individuals with a disability and protected veterans in accordance with applicable law.