Software Engineer (Java,.Net)

Fantom Corporation•Chantilly, VA

3d•Onsite

About The Position

Fantom Corporation is a mission-focused organization supporting critical programs across the defense and intelligence community. We partner with our customers to deliver high-impact technical solutions while fostering a culture built on trust, expertise, and long-term career growth. We are seeking a Full Stack Software Engineer to develop and maintain enterprise web and desktop applications supporting mission-critical classification and information management systems. This role is responsible for designing, developing, and enhancing applications using Java, Python, C++, JavaScript, Microsoft technologies, and legacy platforms while supporting modern web services and enterprise integrations. The ideal candidate has experience developing Java-based enterprise applications, Microsoft desktop and web solutions, web services, and legacy application modernization within secure government environments.

Requirements

Must be fully cleared with a recent polygraph
Must be willing and able to work fully onsite at the location listed in this posting
Experience developing desktop and web applications using C, C++, Visual Basic, and Microsoft .NET technologies
Experience developing enterprise applications using Java
Experience developing applications using the Spring Boot framework
Experience developing classification or enterprise software tools using scripting languages and web services
Experience utilizing Apache CXF for enterprise web service development
Experience deploying and supporting applications using Apache Tomcat
Strong understanding of XML and SOAP-based web services
Experience using JavaScript to develop enterprise application services
Experience developing responsive web applications using JavaScript, HTML, and CSS
Experience maintaining and enhancing Lotus Notes applications
Strong analytical, troubleshooting, and software development skills
Excellent written and verbal communication skills

Nice To Haves

Experience developing applications using Python
Experience with Microsoft Office automation and Microsoft Web Office technologies
Familiarity with NetBeans IDE
Experience modernizing legacy enterprise applications
Experience integrating enterprise applications with web services and APIs
Experience supporting secure government or Intelligence Community environments
Experience working within Agile software development environments
Familiarity with DevSecOps practices and CI/CD pipelines

Responsibilities

Design, develop, and maintain enterprise desktop and web-based applications supporting mission-critical systems
Develop classification and information management tools using Java, Python, C, C++, Visual Basic, and Microsoft .NET technologies
Develop enterprise applications using Java and the Spring Boot framework
Design and implement RESTful and SOAP-based web services
Develop and maintain JavaScript-based application services and interactive web applications
Build responsive web user interfaces using JavaScript, HTML, and CSS
Develop and maintain applications utilizing Apache CXF and Apache Tomcat
Work with XML and SOAP messaging to support enterprise system integrations
Maintain and enhance existing Lotus Notes applications while supporting legacy system modernization initiatives
Develop and maintain Microsoft Office and Microsoft Web Office solutions
Troubleshoot application issues and implement enhancements to improve system performance and reliability
Participate in software testing, code reviews, and application deployments
Collaborate with cross-functional teams to deliver scalable, secure, and maintainable enterprise software solutions
Develop technical documentation supporting application design, implementation, and maintenance