• Managed Puppet roles and modules to configure over 150 on-premises and cloud servers, ensuring optimal performance and availability.• Collaborated with the global IT team to implement infrastructure changes through the IT Change Advisory Board (CAB) and validated deployments post-implementation.• Enhanced infrastructure security with HTTPS, iptables firewalls, MFA, SSH restrictions, and sudo optimization.• Reduced Oracle database licensing costs by 80% by centralizing testing in Jenkins CI environments, improving cost efficiency.• Led security patching for Oracle, RedHat, Java, Apache, and other third-party technologies, ensuring compliance with security standards.• Developed Jenkins CI/CD pipelines for critical applications, streamlining continuous integration and delivery.• Executed POCs and migrated source code between Bitbucket and GitHub, enhancing version control.Automated release management by integrating Git, JIRA, Jenkins CI, and internal web services using REST APIs.• Reduced Git repository sizes by 50%, enhanced security by removing sensitive data from source code repositories.• Automated secrets management, credential rotation, and PKI certificate creation for secure services.• Created Python, Perl, and Bash scripts to automate development, testing, and deployment processes.• Improved data integrity and security through database change and privilege management.• Administered JIRA workflows, automating rules to support Agile teams, and developed Java tools for reporting and task management.• Managed critical infrastructure services like KeyCloak, Jenkins, HA Proxy, SonarQube, and Kubernetes.Integrated Azure SSO via SAML for secure application access.• Conducted Linux training for new hires and analyzed logs with Dynatrace for system diagnostics and issue resolution.

• Provision, prepare dev-test-production Unix VMs using VMware/IBM hypervisor, IBM SAN storage, Oracle PublicCloud as SaaS model and maintain infrastructure resourcesto reduce idle cost• Install, clone, and operate monolith iMX application instance with infrastructure component Oracle Database,Apache Tomcat/Weblogic/NodeJS using huge collection of standard Korn-shell scripts• Maintain disaster recovery solution; manage daily database RMAN application filesystem backup, customizedDataguard - ETL procedure; handle migration action plan in different levels – VM, OS, DB, Application• Implement high availability external services using Apache mod_proxy, secure Apache header configuration• Delivery software stack security patches, opt config files in a patch installation system integrating with versioncontrolsystem – cvs, mercurial, git; compilation and artifact deployment engine written in Perl/Shell• 24/7 support for 100+ customers by a proactive monitoring system – collecting service metrics via sensorswritten in Shell, update internal wiki, customer-knowledge technical documents• Support to build the new Devops system aim to run microservice iMX application, prepare self-host internalDocker registry, Gitlab infrastructure, Artifactory server• Support developers to package their artifacts, dockerize their modular services written in C/C++, Java, Angularintegrated into new Gitlab CI pipeline