Senior Middleware Engineer - API & DevSecOps

International Executive Service Corps; Washington, Northern (District of Columbia, KY); Hybrid; USD 110,000 - 160,000; Full time

Job summary

NuAxis is seeking a Middleware Engineer to design, implement, secure, and support the service layer linking the Angular front end, legacy systems, and Oracle data tier. The role re-platforms legacy logic into maintainable services, owns API implementation, and supports automated testing and DevSecOps delivery.

The ideal candidate has 5+ years in middleware/SOA with Java/Spring Boot, .NET, and Oracle; strong REST API skills; and experience with CI/CD, security, and containerization.

Qualifications

• 5+ years developing service-oriented or middleware solutions using Java/Spring Boot, .NET, Oracle SOA/BPEL/composites, or comparable enterprise technologies.
• Strong REST API design/development skills including validation, error handling, versioning, security, and contract management.
• Experience with workflow orchestration, business-process automation, and re-platforming legacy business logic.
• Working knowledge of Oracle SQL/PLSQL sufficient to design efficient data interactions and collaborate with DBA staff.
• Experience implementing or validating authentication/authorization mechanisms such as SAML, OAuth 2.0, OIDC, or equivalent.
• Experience with unit/integration testing, CI/CD pipelines, static analysis, dependency scanning, and containerized delivery.

Responsibilities

• Design and implement lightweight, maintainable services and APIs supporting interaction between UI, business processes, external systems, and Oracle data.
• Extract and re-platform legacy logic into middleware while preserving behavior and auditability.
• Implement validation, workflow orchestration, authorization checks, error handling, and observability in the service layer.
• Define and maintain API contracts, interface docs, versioning, and integration test support.
• Collaborate with Technical Lead and DBA to optimize database interactions.
• Implement automated unit and integration tests and support QA automation for APIs and workflows.
• Integrate middleware components into CI/CD pipelines, ensuring code quality and security.
• Troubleshoot production-like integration, performance, authentication, and data-consistency issues.
• Support migration, release, rollback, and environment-readiness activities.

Skills

Middleware design

Java/Spring Boot

.NET

Oracle SOA/BPEL

REST API design

Security

CI/CD pipelines

Containerization

Education

Bachelor's degree in Computer Science or related field

Tools

Oracle SQL/PLSQL

Git

DevSecOps

CI/CD tools

Job description

NuAxis is seeking a Middleware Engineer to design, implement, secure, and support the service layer linking the Angular front end, legacy systems, and Oracle data tier. The role re-platforms legacy logic into maintainable services, owns API implementation, and supports automated testing and DevSecOps delivery.

The ideal candidate has 5+ years in middleware/SOA with Java/Spring Boot, .NET, and Oracle; strong REST API skills; and experience with CI/CD, security, and containerization.