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# IRS CAS (Sr. Full Stack Developer/Platform Engineer) -PBBA

- **Company:** Constellation West
- **Location:** Washington, DC, United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Agile Methodology, Databases, Continuous Integration, Linux, Middleware, Java Platform Enterprise Edition (J2EE), Network Administration, OpenShift, Red Hat Enterprise Linux, Secure Coding, Simple Object Access Protocol (SOAP), Software Engineering, Enterprise Software Applications, ReactJS, Spring-boot, SOAPAPI, Containerization, Kubernetes, Information Technology, Data Management, Api Design, Api Gateway, Restful APIs, Devsecops, Microservices
- **Published:** October 2, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9212999/irs-cas-sr-full-stack-developerplatform-engineer-pbba

## About the Role

The candidate needs 5+ years of Java/J2EE and Spring Boot development and sustainment experience, along with ReactJS or comparable UI technology.

Experience should include JDK 17+ upgrades, SSO integration, dependency remediation, RHEL/Linux, OpenShift/Kubernetes, containerization, REST/SOAP, database troubleshooting, Git/GitHub, CI/CD awareness, secure coding, regression/smoke validation, UI and functional defect correction, releases, and rollback.

The IRS also specifically requires demonstrated experience migrating applications from VM-based hosting to containerized/OpenShift-aligned deployment patterns while preserving functionality and external interfaces.

Required Experience

 * Software engineering experience
 * Enterprise API development
 * Java
 * Spring Boot
 * REST and SOAP web services
 * IBM webMethods
 * Enterprise middleware
 * Microservices architecture
 * OpenShift or Kubernetes
 * Enterprise system integration
 * Application modernization
 * Production support and troubleshooting
 * Agile development

Preferred Experience

 * IRS experience
 * Federal Government experience
 * API Gateway experience
 * DevSecOps environments
 * Containerized applications, Bachelor's degree in or equivalent experience.

## Description

Location: Remote, with occasional onsite support for meetings, deployments, production activities, or knowledge transfer as required., Constellation West is an award winning company that delivers Information Technology (IT) engineering services and solutions and non-IT subject matter expertise worldwide. Established in 1997, Constellation West is an industry leader, partnering with key organizations. As a prime contractor or preferred subcontractor, we have a continual list of opportunities to fill nationwide with multiple agencies such as the Department of Veteran Affairs, the Department of Defense, civilian agencies, and the national intelligence community. Many positions supporting the U.S. federal government require our employees to be granted security clearances., Qualified incumbent personnel currently supporting this mission will be afforded Right of First Refusal (ROFR) for applicable positions, consistent with contract requirements and contingent upon continued eligibility, performance, and government approval.