Software Engineer (SE3)

Epsilon C5I (, a division of Epsilon Systems Solutions, is a 100 percent employee-owned company founded in 1998 with more than 20 locations serving the Department of Defense, Department of Energy, Department of Homeland Security, non-profit and commercial customers. The Dayton division is one of only five prime awardees for the 10-year, $4.7 billion NOVASTAR contract supporting the National Air and Space Intelligence Center (NASIC), WPAFB, Ohio.

We are seeking a skilled Full Stack Developer (SE3) or DevSecOps Engineer (SE3) to join our dynamic team in building secure, scalable, and high-performance applications. The ideal candidate will bring a strong foundation in software development alongside a keen understanding of secure coding practices, automation, and deployment pipelines.

Whether you are passionate about writing clean, maintainable code across the frontend and backend, or you are focused on integrating security into CI/CD workflows, infrastructure as code, and cloud-native environments, we value your ability to work collaboratively across development, operations, and security teams. You will play a key role in driving innovation, ensuring software quality, and embedding security throughout the development lifecycle. Candidates must be able to work independently and as part of a technical team and have effective oral and written communication skills. Successful candidates will have strong problem solving and critical thinking skills.

Duties and Responsibilities:

• Maintain and enhance existing systems in the development of new features
• Deploy new secure systems and network
• Conduct post processing and data reduction
• Apply and follow Scrum framework principles
• Write analysis reports and develop briefings
• Work independently and in a team environment

Required Qualifications:

• Bachelor's degree in engineering, computer science, or information technology.
• Minimum years of experience: 10
• Applicant Must have an active DoD Top Secret Security Clearance, with SCI access

Desired Qualifications:

• Backend: Node.js, C++, Golang, etc.
• CI/CD tools (e.g., Jenkins, GitLab CI)
• React and TypeScript/JavaScript
• Cloud security (AWS, Azure, Google Cloud Platform)
• Container security (Docker, Kubernetes)
• Scripting (Python, Bash)
• Databases: SQL (PostgreSQL, MySQL), NoSQL (MongoDB)
• RESTful APIs, GraphQL
• Git, Docker, Kubernetes
• Argo CD, Argo Workflows
• Grafana, Jaeger
• Experience with Linux
• Experience with microservice architecture
• Design, develop, and implement web applications to power a national toolset with a large user base
• Assist senior Software Engineers with routine assignments
• Apply fundamental knowledge of operating systems and programming languages
• Produce well-written designed, testable and efficient code that meets technical requirements and secure coding practices
• Ability to work closely with users to troubleshoot code defects and deploy timely fixes
• Participate in a highly collaborative agile SCRUM team environment, contributing to all phases of the development lifecycle

ADA Notations:

• Regular communication (hearing/speaking).
• Noise conditions range from very quiet to noisy.
• Prolonged use of computer (typing/keyboarding).
• Frequently required to sit for long periods of time, stand, walk, and may occasionally lift and move at least 25 pounds.
• Ability to travel by car, air or other means of transportation, if required.

Epsilon Systems Solutions, Inc. is an equal opportunity employer. Qualified candidates will be considered without regard to legally protected characteristics.