Software Engineer (Java,.Net)

Fantom Corporation

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Chantilly, VA on site Until 10/6/2026 First posted August 7, 2026 Last posted August 7, 2026
Job description
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.

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

Required Qualifications

  • 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

Desired Qualifications

  • 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
  • #CJ
Fantom Corp is a Software Development, Agile Cloud, Cyber Security (Risk Management, Assessments & Authorization (A&A)), Data, AI Platform (Computer Vision Models), Podcasting Media Services, and IT Services provider. Established in 2015, Fantom Corp serves Federal customers with top-notch Cybersecurity Architects, Data Scientists/Analysts, Software Engineers/Developers, DevSecOps Engineers, Project Managers, Identity, Credential Access Management (ICAM) services , and Cloud-certified practitioners. We excel in delivering emerging technologies such as Artificial Intelligence (AI) and Machine Learning (ML) with a focus on identifying trends, object detection, and classification of structured and unstructured data. Fantom Corp possesses mastery in all aspects of digital audio production. We lead in the ideation and creation of efforts for clients who want to harness the power of podcasting. We guide them in selecting the right show format for their needs and goals. As a Small Business, we possess the innovation, speed and flexibility to meet your requirements. 
About this role

Summary

Develops and maintains enterprise web and desktop applications using Java, C++, and Microsoft technologies.

Job title

Software Engineer (Java,.Net)

Experience level

null

Industry

software

Location requirements

Onsite in Chantilly, VA; remote not allowed

Salary

Not specified

Management role

No

Skills & keywords

Required skills

javaspring bootweb servicesxmlsoapjavascripthtmlcsscc++visual basicmicrosoft .netapache cxfapache tomcatlotus notesmicrosoft office

Preferred skills

pythonmicrosoft web officenetbeanslegacy modernizationweb services integrationagiledevsecops

Specializations

full stackenterprise applicationsweb serviceslegacy modernization
Locations

Structured locations inferred from the posting.

Chantilly, VA, USA

On-site City
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