Backend Engineer Java Jobs in Nashua, NH (NOW HIRING)

Valiant Harbor International is a CVE Service-Disabled Veteran Owned Small Business that specializes in technical, programmatic, acquisition, compliance, and financial services for Government science and technology, research and development, and technological programs. At Valiant Harbor International, we help federal agencies solve complex technical challenges by delivering practical, mission-focused solutions.

Valiant Harbor International is seeking a Full-Stack Software Engineer to support advanced U.S. Air Force programs at Hanscom AFB providing expert support in developing secure backend services, APIs, enterprise integrations, and software deployed within Linux-based environments. As a member of a highly technical team, you'll collaborate directly with Air Force engineers and stakeholders to build mission-critical software that integrates complex systems, processes data securely, and supports operational capabilities across government environments. This is a full-time position in a hybrid work environment.

• Design, develop, and maintain secure backend software applications and services using Java.
• Build scalable REST APIs, enterprise integrations, and database-driven applications.
• Develop software to support reliable communication between multiple systems and data sources.
• Develop software that operates within Linux/Unix environments and supports deployment in secure government networks.
• Collaborate directly with Air Force stakeholders to translate mission needs into technical solutions.
• Develop clean, maintainable, and well-tested code following modern software engineering best practices.
• Participate in code reviews and contribute to technical design discussions.
• Troubleshoot complex backend, integration, and performance issues across distributed systems.
• Support secure software development and DevSecOps practices throughout the software lifecycle.
• Contribute to continuous improvement of shared libraries, development tools, and engineering processes.
• Stay current with emerging technologies and recommend new tools and approaches that improve system performance, security, and maintainability.

• Java
• Linux/Unix
• REST APIs
• Enterprise System Integration
• SQL Databases
• Git
• XML
• Secure Software Development
• DevSecOps Practices and CI/CD
• Modern Software Architecture
• Containerization (e.g., Docker/Kubernetes)
• Cloud Technologies (desired)

• Active Secret security clearance required at time of selection; the successful candidate must be able and willing to obtain/maintain a Top Secret security clearance with SCI eligibility after selection.
• Bachelor's degree in Computer Science, Software Engineering, or related STEM discipline.
• 7–10 years of professional software engineering experience.
• Full-stack experience required with deep backend engineering expertise designing and developing secure backend software applications, APIs, and enterprise integrations.
• Experience integrating multiple software systems, services, or data sources within enterprise or mission-critical environments.
• Experience with multiple languages in various environments. Must have Java software language experience working within the Linux/Unix environments.
• Experience with containerization, CI/CD pipelines, cloud technologies, modern Java frameworks, or enterprise integration technologies is preferred.
• Strong analytical, troubleshooting, and problem-solving skills.
• Ability to communicate effectively with technical and non-technical stakeholders.
• Willingness to travel as required.

• Experience supporting Department of Defense or Intelligence Community programs.
• Familiarity with SIPRNet and JWICS environments.
• Experience designing software architecture and technical roadmaps.
• Experience supporting Agile software development teams.
• Former military service or prior experience supporting DoD customers.

Active Secret clearance required prior to selection. Selected candidate must be eligible to obtain a Top Secret clearance with SCI eligibility.

Competitive and commensurate with experience.

At Valiant Harbor International, you'll work alongside experienced professionals supporting some of the nation's most important technology initiatives. As a growing small business, our engineers make meaningful technical contributions, work directly with customers, influence solution design, and solve challenging engineering problems with real-world mission impact.

Valiant Harbor International, LLC is an Equal Opportunity/Affirmative Action employer. Valiant Harbor International prohibits discrimination with respect to the hiring or promotion of individuals, conditions of employment, disciplinary and discharge practices, or any other aspect of employment on the basis of sex, race, color, age, national origin, religion, disability, marital status, sexual orientation, gender identity, pregnancy, veteran status, or any other protected class. If you are an individual with a disability and require a reasonable accommodation to complete any part of the application process, or are limited in the ability or unable to access or use this online application process and need an alternative method for applying, you may contact (202) 417-6705 for assistance.