Senior Java Software Engineer Jobs in Jacksonville, FL

KBR's National Security Solutions team provides advanced engineering and technology solutions supporting the intelligence, defense, and national security communities. Join a team dedicated to developing innovative software solutions that enable critical missions and shape the future of defense technology.

• Innovative Projects
• Work at the forefront of software engineering, enterprise modernization, data integration, cloud technologies, and mission IT solutions.
• Collaborative Environment
• Join a high-performing team that values innovation, technical excellence, knowledge sharing, and continuous improvement.
• Mission Impact
• Design and deliver software systems that directly support national security, defense operations, and mission-critical business objectives.

About KBR

KBR delivers science, technology, engineering, and logistics solutions that help accomplish some of the world’s most challenging missions. Our Government Solutions team supports Department of Defense programs through innovative software engineering, systems integration, application modernization, and enterprise technology services. We are seeking an experienced Senior Software Engineer to support critical Air Force and DoD information technology programs. The successful candidate will serve as a technical leader responsible for designing, developing, modernizing, and maintaining enterprise applications and mission-critical software platforms while supporting operational mission objectives. This role offers the opportunity to work across the full software development lifecycle while collaborating with cross‑functional engineering and program teams.

• Design, develop, and maintain scalable enterprise web applications and distributed software systems.
• Architect, develop, and support RESTful APIs and service‑oriented solutions for internal and external stakeholders.
• Build modern, responsive user interfaces using Angular, TypeScript, HTML5, CSS, and related frontend technologies.
• Lead technical design and software architecture initiatives utilizing object‑oriented programming principles and best practices.
• Collaborate with Program Managers, Product Owners, Architects, and Engineering teams to deliver high‑quality software solutions.
• Support migration and modernization efforts involving legacy applications, cloud‑based platforms, and emerging technologies.
• Design, optimise, and maintain database solutions utilizing SQL Server, Oracle, MySQL, Redis, and related technologies.
• Participate in code reviews, unit testing, debugging, deployment, and production support activities.
• Develop technical documentation, architectural diagrams, interface specifications, and software lifecycle artefacts.
• Evaluate and implement emerging technologies, including AI‑assisted capabilities, automation tools, and integration frameworks.
• Analyse application performance and implement improvements to enhance reliability, scalability, maintainability, and user experience.

• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or a related field.
• 8+ years of professional software development experience supporting enterprise technology environments.
• Strong proficiency in C#, .NET Core, .NET Framework, and object‑oriented software development.
• Experience developing enterprise web applications using Angular and TypeScript.
• Experience designing, developing, and maintaining RESTful APIs and service integrations.
• Strong experience with SQL Server, Oracle, MySQL, or similar relational database platforms.
• Understanding of software development lifecycle (SDLC) methodologies and Agile development practices.
• Excellent problem‑solving, analytical, and troubleshooting skills.
• Strong written and verbal communication skills.
• Ability to obtain and maintain a Secret Security Clearance.

• C# .NET Core / .NET 8+ ASP.NET Angular TypeScript REST API Development SQL Server Oracle MySQL Redis Entity Framework Dapper Git Version Control Linux and Windows Environments Object‑Oriented Design (OOD) Software Design Patterns Microservices Architecture Agile Development Methodologies Application Modernisation Technical Documentation

• Experience with Salesforce technologies, including Apex, Lightning Web Components (LWC), Flows, Triggers, and Connected Apps.
• Experience supporting large‑scale enterprise software systems and high‑volume applications.
• Experience leading technical initiatives, mentoring developers, or serving as a technical lead.
• Experience with cloud‑based application development and integrations.
• Experience modernising legacy software platforms and implementing scalable architectural solutions.
• Experience with AI‑enabled technologies, proof‑of‑concept development, or automation initiatives.
• Master’s degree in Computer Science, Software Engineering, or a related discipline.

• Software Architecture & Design
• Full‑Stack Development
• Enterprise Application Development
• API Design & Integration
• Database Architecture & Optimisation
• Systems Integration
• Cloud Technologies
• Application Modernisation
• DevOps & CI/CD Practices
• Agile Project Delivery
• Technical Leadership
• Stakeholder Collaboration
• Technical Documentation
• Problem Solving & Innovation

At KBR, we are passionate about our people and our Zero Harm culture. These inform all that we do and are at the heart of our commitment to, and ongoing journey toward being a People First company. That commitment is central to our team’s philosophy and fosters an environment where everyone can Belong, Connect and Grow. We Deliver – Together.

KBR is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, colour, religion, disability, sex, sexual orientation, gender identity or expression, age, national origin, veteran status, genetic information, union status and/or beliefs, or any other characteristic protected by federal, state, or local law.

We Value Our People – We create diverse, inclusive environments in which each person can feel safe, respected and valued, and where everyone has opportunities to grow and reach their full potential. We Deliver – We are uncompromising in our commitment to deliver innovative, high‑quality, technology‑led solutions for our customers and exceptional, sustainable value for all our stakeholders. We Are People of Integrity – We value honesty, trust, courage, fairness, prudence and tenacity. We believe doing what’s right for the planet, the communities where we work, and our people is good for business. We Empower – We empower our people with a shared purpose, the right tools and the supportive culture they need to be proactive decision‑makers, to be adaptive to change, and to succeed. We Are a Team of Teams – We have a will to succeed, but we value the achievements of our team of teams over individual accomplishments. Our collective focus makes us a better, stronger, more effective company. We have also embedded environmental, social and governance (ESG) principles in every business operation and corporate function. Not only are we committed to operating safely, sustainably and equitably, but we are also committed to using our capabilities and expertise to help our customers accomplish their sustainability goals.

Worldwide, KBR employs a diverse workforce approximately 29,000 people strong, with customers in more than 80 countries and operations in 40 countries. At KBR, We Deliver.