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Salary
≈ $160k – $299k per year (Estimated)
Location
In office (Chantilly)
Seniority
Principal · 12+ years exp

Confirmed on the employer's own hiring board on Oct 29, 2026. First seen by Alion on Aug 10, 2026. Fantom Corporation scores B on the Alion truth index.

Overview
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Impact
Profile match
Fantom Corporation is an American IT services contractor that supports federal, defence and intelligence community programmes as well as commercial clients. It provides network engineering, data architecture, cloud, software development and systems administration, with staff in Chantilly, Hanover and McLean. The company is headquartered in Leesburg, Virginia, United States.

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 an experienced Software Engineer to support a critical government mission in Chantilly, VA. This position will develop and enhance secure, scalable software applications that directly support mission operations.

The Software Engineer will work within an Agile development environment and collaborate with engineers, architects, and stakeholders to design, build, test, and deploy modern software solutions. The role emphasizes Java and Python development, RESTful API integration, relational databases, and secure application development within Linux/Unix environments.

Responsibilities

  • Design, develop, test, deploy, and maintain scalable software applications and services
  • Develop backend software solutions using Python
  • Develop and maintain applications utilizing Java and Python
  • Design, build, integrate, and consume RESTful APIs supporting application functionality and system interoperability
  • Design, develop, and optimize solutions utilizing relational databases
  • Collaborate with software engineers, architects, and stakeholders to define technical requirements and implement effective solutions
  • Troubleshoot software defects, system integration issues, and application performance problems
  • Participate in code reviews and promote software engineering best practices
  • Contribute throughout the full software development lifecycle, from requirements analysis through deployment and sustainment
  • Participate in Agile ceremonies and activities, including sprint planning, development, testing, and retrospectives
  • Ensure software solutions meet security, performance, scalability, and maintainability requirements

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
  • Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or a related technical discipline, or equivalent experience
  • Expert-level software engineering experience; the RFQ identifies the position as requiring 12+ years of experience with a Master’s degree
  • Experience developing applications using Java and Python
  • Experience designing and consuming RESTful APIs
  • Strong experience with relational databases such as:
    • PostgreSQL
    • Oracle
    • Microsoft SQL Server
    • MySQL
    • Experience developing and maintaining software within Linux/Unix environments
    • Understanding of software engineering best practices, including version control, software testing, and code reviews
    • Experience working within Agile software development environments

Desired Qualification

    • Experience developing cloud-based applications, preferably within AWS environments
    • Experience with CI/CD pipelines and DevOps practices
    • Experience with containerization technologies and microservices architectures
    • Experience with Git, Jenkins, Terraform, or similar development and infrastructure tools
    • Familiarity with Elasticsearch, OpenSearch, or related enterprise search technologies
    • Experience supporting government or Intelligence Community programs
    • #CJ
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