Senior API Support Engineer - Remote Tier 3

DecisionPoint Corporation

Reston (VA)

On-site

USD 120,000 - 150,000

Full time

14 days+

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Job summary

DecisionPoint Corporation seeks an API Support Engineer (Tier 3) to troubleshoot and resolve complex API, integration, and data-flow issues across enterprise applications in a large federal and DoD-aligned environment. This senior role escalates from Tier 1/2 and partners with developers, integration engineers, and cybersecurity staff to restore service and ensure resilient API workflows.

This fully remote position in the United States requires an active Top Secret clearance (Tier 5) and a

Qualifications

6+ years in API support, backend troubleshooting, or application support.
Experience diagnosing API defects, schema mismatches, and integration failures.
Experience with JSON schemas, OpenAPI/Swagger, and API documentation.
Experience troubleshooting OAuth2, SAML, or JWT authentication flows.
Experience in federal or DoD mission environments is preferred.

Responsibilities

Resolve complex API issues escalated from Tier 1/2, including endpoint failures and authentication problems.
Triage enterprise API incidents involving integrations and middleware.
Diagnose data mapping issues and transformation logic errors.
Collaborate with developers and integration teams to reproduce issues and validate fixes.
Support incident response by collecting logs and performing root cause analysis.
Validate API behavior against OpenAPI specs and version requirements.
Assist in testing API changes and deployments.
Document findings and recurring issue patterns in knowledge bases.
Participate in Change Control Board processes when production changes are involved.
Provide guidance on API usage and best practices to application teams.
Coordinate with cybersecurity teams on authentication and data security concerns.