MANTECH · 14 hours ago
Senior API Developer
Chantilly, VA
Full-time
Onsite
Senior Level
6+ years expMANTECH seeks an experienced Senior API Developer to design, build, and maintain mission-critical integrations using MuleSoft. In this hands-on role, you will apply API-led connectivity principles to connect diverse enterprise systems and ensure the operational stability of the platform.
Cyber SecurityInformation TechnologySecurityTelecommunications
No H1B
Security Clearance RequiredU.S. Citizen Only
Responsibilities
Design, build, test, and deploy robust, secure, and reusable APIs and integrations
Serve as a subject matter expert on API-led connectivity, runtime management, and connector configuration
Develop and deploy new APIs, connectors, and data transformations based on prioritized requirements from the product backlog
Conduct static/dynamic code analysis and vulnerability scanning to ensure secure code
Perform comprehensive unit, integration, and performance testing to ensure the quality and reliability of all new features
Provide on-call Tier 2/3 support for platform-related incidents and service requests related to API performance or errors, as needed
Support security accreditation (RMF/ATO) activities by implementing required security controls and remediating findings from the Plan of Action & Milestones (POA&M), as needed
Qualification
Required
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
Experience with integrating security best practices into the DevSecOps lifecycle
Must have a current/active TS/SCI with polygraph
Preferred
MuleSoft Developer or Architect Certification
Experience integrating with Salesforce
Experience with the MuleSoft Anypoint Platform
Experience with containerization and orchestration (e.g., Kubernetes)
Familiarity with the Risk Management Framework (RMF) and NIST SP 800-53
Experience writing technical documentation
Company
MANTECH
ManTech is a technology company that offers cyber, IT, and data analytics technologies and solutions for security programs.
5001-10000 employees
Funding
Current Stage
Public CompanyTotal Funding
unknown2022-05-16Acquired
2002-02-07IPO
Leadership Team
Matt Tait
Chief Executive Officer & President
Gavin Greene
VP of Business Development
Recent News
2026-01-16
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2025-12-11
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2025-12-10
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