Senior Full Stack Developer / Platform Engineer – PBBA

Senior Full Stack Developer / Platform Engineer - PBBAClient: Internal Revenue Service (IRS)Program: Common API Services (CAS)Openings: 1Location: Remote - United States / Washington, DC as requiredGovernment Site: IRS, 1111 Constitution Avenue NW, Washington, DC 20224Work Arrangement: Primarily Remote / occasional on-site supportMinimum Experience: 5+ yearsCandidate Pay Range: $70.18-$72.93/hourPosition Status: Contingent upon contract awardPosition SummarySMX Services & Consulting, Inc. is seeking a Senior Full Stack Developer / Platform Engineer - PBBA to support modernization and sustainment of IRS PBBA applications.The position requires hands-on Java/Spring Boot backend development combined with modern frontend-development expertise, Linux/OpenShift experience, containerization, application migration, and enterprise integration capabilities.The selected candidate will help migrate applications from legacy or virtual-machine-based environments to modern, containerized OpenShift-aligned architectures while maintaining existing business functionality and external interfaces.Required QualificationsMinimum 5 years of relevant full-stack application-development experience.Java/J2EE.Spring Boot.ReactJS or comparable modern JavaScript framework.Full-stack web application development.JDK 17 or newer.REST APIs.SOAP web services.Single Sign-On integration.Application dependency management.Application dependency remediation.RHEL/Linux.Red Hat OpenShift.Kubernetes.Container technologies.Application containerization.Deployment configuration.Database-connected applications.Git/GitHub.CI/CD process familiarity.Secure coding.Developer-level regression validation.Application smoke testing.UI troubleshooting.Functional defect remediation.Key ResponsibilitiesDevelop and maintain Java/Spring Boot applications.Develop and maintain ReactJS or comparable frontend applications.Perform full-stack application development.Upgrade applications to current Java/JDK versions.Support JDK 17+ application compatibility.Integrate applications with Single Sign-On services.Remediate software libraries and application dependencies.Modernize applications operating in RHEL/Linux environments.Containerize applications.Prepare applications for Red Hat OpenShift deployment.Develop application deployment-configuration inputs.Develop and maintain REST integrations.Develop and maintain SOAP integrations.Troubleshoot database-connected applications.Conduct developer-level regression validation.Conduct application smoke validation.Troubleshoot and correct UI defects.Troubleshoot and correct functional defects.Support application vulnerability remediation.Prepare application releases.Develop rollback and recovery inputs.Maintain as-built documentation.Support migration from virtual-machine-based hosting to containerized platforms.Preserve existing functionality and external interfaces throughout modernization.Support technical knowledge transfer.Preferred ExperienceEnterprise application modernization.VM-to-container migrations.OpenShift migrations.Java/Spring Boot modernization.ReactJS enterprise applications.High-availability Government or regulated environments.API-based enterprise architectures.Secure enterprise application development.Location RequirementThe position is primarily remote within the United States.The selected candidate must be capable of supporting the IRS Government site located at:Internal Revenue Service1111 Constitution Avenue NWWashington, DC 20224On-site support may be required for deployments, technical meetings, modernization activities, troubleshooting, releases, cutovers, or knowledge transfer.Citizenship and SecurityCandidate must be able to satisfy applicable IRS suitability, background investigation, PIV/SmartID, security training, Government system-access, and protected-information handling requirements.No Secret or Top Secret clearance requirement has been identified.CompensationCandidate Pay Range: $70.18-$72.93/hourFinal compensation depends on experience, technical qualifications, employment classification, and final SMX approval.Position is contingent upon contract award.