API Support Engineer (Tier 3)

Overview DecisionPoint seeks an API Support Engineer (Tier 3) to troubleshoot and resolve complex API, integration, and data flow issues across enterprise applications within a large federal and DoD-aligned mission environment. This senior troubleshooting role supports escalations from Tier 1 and Tier 2 teams, analyzes integration failures, resolves data mapping discrepancies, and provides in-depth diagnostic support for API consumers and backend systems. The API Support Engineer serves as a technical escalation point, partnering with developers, integration engineers, cloud engineers, and system owners to restore service, identify root causes, and ensure resilience across enterprise API workflows. This position is fully remote. Duties & Responsibilities The API Support Engineer (Tier 3) will: Resolve complex API issues escalated from Tier 1 and Tier 2 support, including endpoint failures, schema mismatches, and authentication problems. Triage enterprise-wide API incidents involving integrations, middleware, and downstream systems. Diagnose data mapping issues, payload inconsistencies, and transformation logic errors. Work closely with development and integration teams to reproduce issues and validate fixes. Support incident response by collecting logs, analyzing error patterns, and performing root cause analysis. Validate API behavior against OpenAPI/Swagger specifications, schemas, and version requirements. Assist in testing API changes, version upgrades, and integratio