​This is a senior, fully remote API Support Engineer (Tier 3) role focused on troubleshooting and resolving complex API, integration, and data flow issues across enterprise applications within a large federal and DoD-aligned mission environment. This role serves as the highest escalation point, requiring in-depth diagnostic support for API consumers, backend systems, and integration middleware, ensuring resilience and service restoration.

• ​Location: Fully Remote (US).
• ​Clearance: Must hold an active Top Secret clearance (supported by a Tier 5 background investigation).
• ​Experience: Minimum 6 years in API support, backend troubleshooting, or application technical support.
• ​Certifications (Required): ITIL v4 Foundation and CompTIA Security+.
• ​Focus: Resolving Tier 3 escalations, data mapping, authentication issues (OAuth2, SAML, JWT), root cause analysis, and validating API behavior against OpenAPI/Swagger specifications.

​Duties & Responsibilities: Escalation, Diagnosis, and Validation

​The engineer provides expert-level diagnosis and acts as a key liaison between support and development teams.

• ​Complex Resolution: Resolve complex API issues escalated from Tier 1 and Tier 2 support, including endpoint failures, schema mismatches, and authentication problems.
• ​Triage & RCA: Triage enterprise-wide API incidents, diagnose data mapping issues, payload inconsistencies, and transformation logic errors. Perform root cause analysis (RCA) by collecting logs and analyzing error patterns.
• ​API Validation: Validate API behavior against OpenAPI/Swagger specifications, schemas, and version requirements. Assist in testing API changes prior to deployment.
• ​Cross-Functional Partnership: Work closely with development, integration, cloud, and cybersecurity teams to reproduce issues, validate fixes, and address security concerns (OAuth2, SAML, JWT).
• ​Documentation & Governance: Document findings and resolutions in the knowledge base. Participate in Change Control Board (CCB) processes when fixes affect production integrations.

​Required Technical Knowledge

​The role requires strong foundational knowledge of API architecture, security, and enterprise environments.

• ​API Fundamentals: Strong knowledge of REST APIs, endpoint communication, and data structures.
• ​Integration Troubleshooting: Experience diagnosing and resolving API defects, schema mismatches, and integration failures. Familiarity with middleware, integration layers, and message brokers.
• ​Security & Specs: Experience troubleshooting authentication and authorization flows (OAuth2, SAML, JWT). Experience working with JSON schemas, OpenAPI/Swagger specifications, and API documentation.
• ​Logging & Monitoring: Experience analyzing logs from API gateways, application servers, or integration pipelines. Familiarity with monitoring tools used for API health.
• ​Preferred Knowledge: Experience with AWS GovCloud integration patterns, knowledge of event-driven architectures, and experience with scripting/automation for diagnostics.