API Integration Specialist; REST, SOAP

Position: API Integration Specialist (REST, SOAP)

Requirements

Must have:– Active Secret Clearance preferred – Bachelors Degree in Computer Science or Information Systems – Over 3 years of experience in designing and executing API integrations and backend services in Java – Proficient hands-on development experience with Java and Spring Boot (REST controllers, service layers, security, configuration) – Strong knowledge of SQL: understanding of schema, query optimization, joins, indexing strategies, and performance troubleshooting – Familiar with API documentation and standards:
OpenAPI/Swagger, JSON schema, API versioning – Deep understanding of REST, SOAP, XML, and JSON in API development

– Experience with service mesh/zero trust patterns, or enterprise API management tools

Responsibilities:

• Design, develop, and maintain RESTful APIs and integration services using Java, Spring Boot, and microservices patterns – Implement API contracts (OpenAPI/Swagger) alongside versioning strategies, backward compatibility, and deprecation plans – Create integrations for internal platforms (identity, logging, data services) and external partner systems using secure API methodologies (OAuth2/OIDC when applicable) – Develop message transformation, orchestration, and mediation logic (JSON/XML), including canonical models as necessary – Employ resiliency patterns, including retries with backoff, circuit breakers, idempotency, rate limiting, bulkheads, and timeouts – Integrate microservices with Oracle databases utilizing robust data access patterns (JPA/Hibernate) – Compose and optimize SQL queries as well as stored procedures/packages (when relevant), ensuring performance and efficient indexing – Support data mapping, validation rules, referential integrity, and transactional consistency – Establish automated tests: unit, integration, contract, and regression;
  
  assist with performance/load testing – Diagnose incidents across environments; conduct root cause analysis and implement corrective measures

Company:

At Nationwide IT Services (NIS), we are an IT and Management consulting company, proudly recognized as a CVE-verified Service-Disabled Veteran-Owned Small Business. Our mission is to provide value-driven services to our clients by leveraging technology, skilled professionals, and industry best practices to deliver innovative solutions. We offer an appealing benefits package including medical, dental, and vision insurance, life and disability insurance, a 401(k) plan with employer match, paid holidays, PTO (sick/vacation), commuter benefits, an employee assistance program (EAP), educational reimbursement, and even Pet Insurance.

Join our dynamic team located in a hybrid setup, commutable to Northern VA/DCA.

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