{"schemaVersion":"jobsearcher.job.v1","id":"46d6cfc662ff765fe99fccc7","url":"https://jobsearcher.com/jobs/46d6cfc662ff765fe99fccc7","canonicalUrl":"https://jobsearcher.com/jobs/46d6cfc662ff765fe99fccc7","title":"Senior API Developer","description":"MANTECH seeks an experienced Senior API Developer to design, build, and maintain mission-critical integrations using MuleSoft. You will be a key member of a six-person team supporting the integration, deployment and production sustainment of the MuleSoft Private Cloud Edition (PCE) solution supporting a key Intelligence Community (IC) customer. This position is based in Chantilly, VA\nIn this hands-on role, you will apply API-led connectivity principles to connect diverse enterprise systems, including Salesforce, on-prem, cloud services or other SaaS platforms. You will work within a fast-paced Agile (Scrum) environment to rapidly deliver new features, integrate security (DevSecOps) at every step, and ensure the operational stability of the platform.\nResponsibilities include but are not limited to:\nDesign, build, test, and deploy robust, secure, and reusable APIs and integrations.\nServe as a subject matter expert on API-led connectivity, runtime management, and connector configuration.\nDevelop and deploy new APIs, connectors, and data transformations based on prioritized requirements from the product backlog.\nConduct static/dynamic code analysis and vulnerability scanning to ensure secure code.\nPerform comprehensive unit, integration, and performance testing to ensure the quality and reliability of all new features.\nProvide on-call Tier 2/3 support for platform-related incidents and service requests related to API performance or errors, as needed.\nSupport security accreditation (RMF/ATO) activities by implementing required security controls and remediating findings from the Plan of Action & Milestones (POA&M), as needed.\nMinimum Qualifications:\n6+ years of hands-on software development experience for an IC customer\n6+ years of experience in a customer facing role supporting an IC customer\n5+ years of experience designing and building secure, robust, and reusable RESTful APIs using API-led connectivity principles.\n5+ years hands-on experience programming in Java\nFamiliarity with DevSecOps practices, including CI/CD pipelines, static/dynamic code analysis, and vulnerability scanning.\nStrong understanding of integration patterns, data transformations, error handling, and monitoring.\nExperience with integrating security best practices into the DevSecOps lifecycle.\nPreferred Qualifications:\nMuleSoft Developer or Architect Certification.\nExperience integrating with Salesforce.\nExperience with the MuleSoft Anypoint Platform\nExperience with containerization and orchestration (e.g., Kubernetes).\nFamiliarity with the Risk Management Framework (RMF) and NIST SP 800-53\nExperience writing technical documentation\nClearance Requirements:\nMust have a current/active TS/SCI with polygraph.\nPhysical Requirements:\nMust be able to remain in a stationary position 50% of the time.\nNeeds to occasionally move about inside the office to access file cabinets, office machinery, etc.\nFrequently communicates with co-workers, management, and customers, which may\ninvolve delivering presentations. Must be able to exchange accurate information in\nthese situations.","company":"ManTech","rawCompany":"mantech","city":"Gaithersburg","state":"MD","isRemote":false,"isActive":false,"createdAt":"2026-04-12T19:10:45.747Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1211.00","title":"Computer Systems Analysts","slug":"computer-systems-analysts"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Senior API Developer","description":"MANTECH seeks an experienced Senior API Developer to design, build, and maintain mission-critical integrations using MuleSoft. You will be a key member of a six-person team supporting the integration, deployment and production sustainment of the MuleSoft Private Cloud Edition (PCE) solution supporting a key Intelligence Community (IC) customer. This position is based in Chantilly, VA\nIn this hands-on role, you will apply API-led connectivity principles to connect diverse enterprise systems, including Salesforce, on-prem, cloud services or other SaaS platforms. You will work within a fast-paced Agile (Scrum) environment to rapidly deliver new features, integrate security (DevSecOps) at every step, and ensure the operational stability of the platform.\nResponsibilities include but are not limited to:\nDesign, build, test, and deploy robust, secure, and reusable APIs and integrations.\nServe as a subject matter expert on API-led connectivity, runtime management, and connector configuration.\nDevelop and deploy new APIs, connectors, and data transformations based on prioritized requirements from the product backlog.\nConduct static/dynamic code analysis and vulnerability scanning to ensure secure code.\nPerform comprehensive unit, integration, and performance testing to ensure the quality and reliability of all new features.\nProvide on-call Tier 2/3 support for platform-related incidents and service requests related to API performance or errors, as needed.\nSupport security accreditation (RMF/ATO) activities by implementing required security controls and remediating findings from the Plan of Action & Milestones (POA&M), as needed.\nMinimum Qualifications:\n6+ years of hands-on software development experience for an IC customer\n6+ years of experience in a customer facing role supporting an IC customer\n5+ years of experience designing and building secure, robust, and reusable RESTful APIs using API-led connectivity principles.\n5+ years hands-on experience programming in Java\nFamiliarity with DevSecOps practices, including CI/CD pipelines, static/dynamic code analysis, and vulnerability scanning.\nStrong understanding of integration patterns, data transformations, error handling, and monitoring.\nExperience with integrating security best practices into the DevSecOps lifecycle.\nPreferred Qualifications:\nMuleSoft Developer or Architect Certification.\nExperience integrating with Salesforce.\nExperience with the MuleSoft Anypoint Platform\nExperience with containerization and orchestration (e.g., Kubernetes).\nFamiliarity with the Risk Management Framework (RMF) and NIST SP 800-53\nExperience writing technical documentation\nClearance Requirements:\nMust have a current/active TS/SCI with polygraph.\nPhysical Requirements:\nMust be able to remain in a stationary position 50% of the time.\nNeeds to occasionally move about inside the office to access file cabinets, office machinery, etc.\nFrequently communicates with co-workers, management, and customers, which may\ninvolve delivering presentations. Must be able to exchange accurate information in\nthese situations.","datePosted":"2026-04-12T19:10:45.747Z","dateModified":"2026-04-12T19:10:45.747Z","hiringOrganization":{"@type":"Organization","name":"ManTech","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Gaithersburg","addressRegion":"MD","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"46d6cfc662ff765fe99fccc7"},"url":"https://jobsearcher.com/jobs/46d6cfc662ff765fe99fccc7"}}