C5I Principal Software Engineer

Principal Software Engineer

We are seeking a Principal Software Engineer to support the C5I (Command, Control, Communications, Computing, Cyber and Intelligence) product line within the Missile Defense Sensors (MDS) Software Department. Our teams deliver world-class software across an ecosystem of technologies and applications, including Linux services, microservices architectures, REST APIs, Windows front-end applications, and HTML/TypeScript UIs.

C5I applications are implemented using a wide range of languages, including C++, Java, JavaScript/TypeScript, Lua, C#, and Python, and are built and delivered through modern CI/CD pipelines. We operate within Agile and DevSecOps principles, enabling high-frequency, high-quality deployments across the value stream.

This position is located onsite in Tewksbury, Massachusetts.

What You Will Do

• 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/TypeScript 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.

What You Will Learn

• 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 DevSecOps best practices supporting high-frequency, high-quality deployment pipelines.
• Leadership and mentorship skills that foster technical growth across teams.

Qualifications You Must Have

• Typically requires a Bachelor's in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 8 years of prior relevant experience unless prohibited by local laws/regulations.
• Experience as a software developer in C++ and/or Java, including Git workflows, code reviews, unit testing, and development in RedHat/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 U.S. government issued Secret security clearance is required after the start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Qualifications We Prefer

• Domain knowledge in Command-and-Control operations, including Link16, 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.