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 integration adjustments prior to deployment. Document findings, resolutions, and recurring issue patterns in the enterprise knowledge base. Participate in Change Control Board (CCB) processes when fixes affect production integrations. Provide guidance to application teams on API usage, integration best practices, and troubleshooting steps. Work with cybersecurity teams when API issues intersect with authentication, authorization, or data security concerns. Support monitoring and alerting improvements for API endpoints and integration workflows. Qualifications Clearance Requirement Must hold an active Top Secret clearance , supported by a Tier 5 background investigation. Education (Required) Bachelor’s degree in Information Systems, Computer Science, Software Engineering, or a related technical field. Experience (Required) Minimum 6 years of experience in API support, backend troubleshooting, or application technical support. Experience diagnosing and resolving API defects, schema mismatches, and integration failures. Experience working with JSON schemas, OpenAPI/Swagger specifications, and API documentation. Experience troubleshooting authentication and authorization flows (OAuth2, SAML, JWT). Experience supporting enterprise IT environments, preferably within federal or DoD missions. Technical Knowledge (Required) Strong knowledge of REST APIs, endpoint communication, and data structures. Familiarity with middleware, integration layers, and message brokers. Experience analyzing logs from API gateways, application servers, or integration pipelines. Understanding of data mapping, transformation, and error-handling logic. Familiarity with monitoring tools used for API health and performance. Technical Knowledge (Preferred) Experience with AWS GovCloud integration patterns. Knowledge of event-driven architectures or asynchronous API workflows. Experience with scripting or automation to support diagnostics. Certifications Required: ITIL v4 Foundation CompTIA Security+ Preferred: Additional API or cloud certifications (AWS Developer, API testing, etc.) Skills Strong problem-solving abilities for complex, multi-system issues. Excellent communication skills for interacting with developers, engineers, and stakeholders. High attention to detail and ability to work through ambiguous technical symptoms. Ability to document troubleshooting steps and resolution procedures clearly. Strong customer-service orientation with a mission-focused mindset. Our Equal Employment Opportunity Policy EEO and Affirmative Action Policy: DecisionPoint Corporation is an Equal Employment Opportunity and Affirmative Action employer. It is the policy of DecisionPoint Corporation to provide equal employment opportunity in accordance with all applicable Equal Employment Opportunity/Affirmative Action laws, directives and regulations to all employees and qualified applicants without regard to race, ethnicity, color, religion, national origin, sex, age, disability status, pregnancy, sexual orientation, gender identity, genetic information, protected veteran status, or any other protected status under Federal, State or Local laws. Pay Transparency Policy: In accordance with Presidential Executive Order 13665, DecisionPoint Corporation will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay or the pay of another employee or applicant. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor's legal duty to furnish information. Authorization to Share Resume and Personal Information: By expressing your interest and submitting your resume for this position, you authorize DecisionPoint Corporation to share your resume, as well as personal information included on the resume, with its subsidiaries, affiliates and teaming partners for the purpose of considering you for this position and other available positions requiring comparable skills, education and experience. Should DecisionPoint Corporation. or its affiliates and teaming partners wish to initiate pre-employment discussions, you will be asked to complete an employment application and related employment documents.