API Integration Specialist

API Integration Specialist Hybrid schedule:

• On-site Tuesday, Wednesday, and Thursday Active Secret Clearance Nationwide IT Services, NIS, is seeking an API Integration Specialist for the following potential opportunity: Design, develop, and maintain RESTful APIs and integration services using Java, Spring Boot, and microservices patterns.
• Implement API contracts (OpenAPI/Swagger), versioning strategies, backward compatibility, and deprecation plans.
• Build integrations to internal platforms (identity, logging, data services) and external partner systems using secure API patterns (OAuth2/OIDC where applicable).
• Develop message transformation, orchestration, and mediation logic (JSON/XML), including canonical models when needed.
• Implement resiliency patterns, retries with backoff, circuit breakers, idempotency, rate limiting, bulkheads, and timeouts.
• Integrate microservices with Oracle databases using robust data access patterns (JPA/Hibernate).
• Write and optimize SQL queries, stored procedures/packages (if applicable), and ensure efficient indexing and performance.
• Support data mapping, validation rules, referential integrity, and transactional consistency.

Build automated tests:

• unit, integration, contract, and regression; support performance/load testing.
• Troubleshoot incidents across environments; perform root cause analysis and implement preventative fixes.

Primary Objectives:

• Assist in the Discovery Phase activities of gathering user requirements, business analysis, legacy system analysis, Epic/Story creation, external data integration planning, and product backlog management.

Qualifications:

• Active Secret Clearance Bachelor’s Degree in Computer Science or Information Systems 3+ years of experience designing and implementing API integrations and backend services in Java.
• Strong hands-on development experience with Java and Spring Boot (REST controllers, service layers, security, configuration).

Solid experience with SQL:

• schema understanding, query optimization, joins, indexing strategies, and performance troubleshooting.

Familiarity with API documentation and standards:

• OpenAPI/Swagger, JSON schema, API versioning.
• Strong understanding of REST, SOAP, XML, and JSON in API development.
• Experience with service mesh / zero trust patterns, or enterprise API management tooling.
• About Nationwide IT Services NIS is an IT and Management consulting company that is a CVE-verified Service-Disabled Veteran- Owned Small Business.
• Our mission is to deliver value-added services to our customers, leveraging technology, people, and industry best practices to implement innovative solutions through our trusted employees and team members. Our benefits package includes medical, dental, and vision insurance, life and disability insurance, 401(k) plan with employer match, paid holidays, PTO (sick/vacation), commuter benefits, employee assistance program (EAP), and educational reimbursement, along with Pet Insurance. Nationwide IT Services, Inc. provides equal employment opportunities (EEO) to all qualified applicants regardless of race, color, religion, sex, national origin, sexual orientation, gender identity, genetics, disability, or protected veteran status. Powered by JazzHR