API Integration Specialist

Nationwide IT Services

1d•Hybrid

About The Position

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.

Requirements

Active Secret Clearance preferred.
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.

Responsibilities

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.
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.