Senior API Developer

MANTECH seeks an experienced Senior API Developer to design, build, and maintain mission-critical integrations using MuleSoft. The role is based in Chantilly, VA, and involves applying API-led connectivity principles to connect diverse enterprise systems. The successful candidate will work within a fast-paced Agile environment to rapidly deliver new features, integrate security at every step, and ensure the operational stability of the platform.

Requirements

• 6+ years of hands-on software development experience for an IC customer
• 6+ years of experience in a customer-facing role supporting an IC customer
• 5+ years of experience designing and building secure, robust, and reusable RESTful APIs using API-led connectivity principles
• 5+ years hands-on experience programming in Java
• Familiarity with DevSecOps practices, including CI/CD pipelines, static/dynamic code analysis, and vulnerability scanning
• Strong understanding of integration patterns, data transformations, error handling, and monitoring

Benefits

• Health insurance
• Retirement plan
• Paid time off
• Employee relocation assistance
• Professional development opportunities