Perumalsamy Rengasamy

• Provided L2/L3 support for logistics applications, ensuring system availability
and performance.
• Led a team to develop cloud-based tools, automating deployment processes
and reducing deployment times by 30%.
• Implemented an incident response framework, decreasing downtime by 25%
annually and enhancing customer satisfaction.
• Collaborated with cross-functional teams (development, QA, infrastructure) to
resolve application issues and improve system performance.
• Designed and executed a cloud migration strategy that cut infrastructure
costs by 20% while maintaining high performance.
• Managed incident, change, and problem management processes in
adherence to ITIL best practices.
• Identified system bottlenecks and optimized performance in collaboration
with development teams.
• Worked with security teams to enforce security controls, conduct audits, and
ensure compliance with relevant regulations.
• Automated routine maintenance tasks to improve efficiency and reduce
manual efforts.
• Conducted regular Disaster Recovery tests to ensure business continuity.
• Provided on-call support 24/7
• Performed cloud migration for RDS databases (MySQL, PostgreSQL) and
instances, ensuring smooth transition and optimized performance.
• quickly and ensuring SLAs for availability and performance.

• Lead L2/L3 production support for logistics applications, maintaining SLA compliance and high availability across
business-critical platforms.
• Spearheaded cloud-based automation tools development, reducing deployment times by 30% and minimizing release
risk.
• Designed incident response framework that decreased annual downtime by 25% and improved customer satisfaction
scores.
• Executed AWS and GCP cloud migration (RDS, EC2) cutting infrastructure costs by 20% while sustaining performance
benchmarks.
• Managed end-to-end deployment of Django and React applications via Nginx (Linux) and IIS (Windows Server).
• Configured SSL/TLS certificates (GoDaddy, Arvix); coordinated with cloud vendors on billing and capacity
management.
• Governed incident, change, and problem management aligned with ITIL; produced RCA reports and post-incident
reviews.
• Leveraged AI tools (Claude AI, ChatGPT) to automate repetitive operational tasks, generate shell scripts, and
accelerate root cause analysis — reducing manual effort and human error.
• Mentored junior engineers, standardized runbooks, and conducted knowledge-transfer sessions to reduce MTTR.
• Conducted regular Disaster Recovery drills; collaborated cross-functionally with Dev, QA, and Infrastructure teams.

• Provided L2/L3 support for banking applications on distributed cloud
platforms.
• Streamlined deployment with CI/CD pipelines using Jenkins and GitLab,
reducing lead time for changes
• Led greenfield migration projects, achieving active-active application
availability across data canters.
• Utilized Jira for issue tracking, and monitored production jobs in ESP
Workstation and Control-M
• Led process enhancements through team leadership in daily issue reviews,
RCA, and monitoring tool training.
• Created Knowledge Base articles to improve issue resolution efficiency and
knowledge sharing within the team.
• Designed and implemented a zero-downtime deployment strategy that was
adopted company-wide, leading to 100% availability during updates.
• Assisted in the migration of legacy applications to cloud platforms, improving
system reliability and scalability
• Built and optimized custom monitoring tools using Prometheus and Grafana,
reducing incident response times by 35%

• Delivered L2/L3 support for banking-grade applications across distributed cloud platforms ensuring regulatory
compliance.
• Built and maintained CI/CD pipelines using Jenkins and GitLab, significantly reducing deployment lead times.
• Architected a zero-downtime deployment strategy adopted company-wide, achieving 100% uptime during release
windows.
• Led greenfield migrations enabling active-active application availability across geographically distributed data centres.
• Authored Knowledge Base articles and SOPs; led daily issue reviews, RCA sessions, and monitoring tool training.
• Monitored production jobs via ESP Workstation and Control-M; tracked and resolved incidents using Jira.
• Bridged communication between development, QA, and operations teams, accelerating incident resolution timelines.

• Provided production support for 3, 000+ Linux/Unix servers, achieving 99.98%
uptime through proactive monitoring and maintenance.
• Conducted root cause analysis, implementing design changes that reduced
incident recurrence by 70% and improved system reliability.
• Deployed and configured Linux servers in physical and virtual environments.
• Managed high availability using Veritas Clustering (VxVm, VxFS).
• Automated tasks with shell scripts, boosting efficiency.
• Coordinated with third-party vendors for issue resolution, server upgrades,
and migrations.
• Built 100+ VMware virtual servers and applied patches across physical/virtual
environments.
• Automated SSL certificate renewal, ensuring 100% security compliance.
• Led decommissioning of outdated infrastructure servers.

• Led 24x7 production support for 3, 000+ Linux/Unix servers, achieving 99.98% uptime across UK retail infrastructure.
• RCA-driven design changes reduced incident recurrence by 70%; championed a culture of permanent fixes over
workarounds.
• Administered high-availability clusters using Veritas Clustering (VxVM, VxFS) across physical and VMware
environments.
• Deployed 100+ VMware virtual servers; managed full patch lifecycle across physical and virtual server estate.
• Automated SSL certificate renewal and routine admin tasks via shell scripts, achieving 100% compliance with zero
manual effort.
• Managed vendor relationships for hardware upgrades, escalations, and decommissioning; mentored junior
administrators.

• Supported 300+ Windows and Linux servers, handling production issues and
weekend maintenance (including patching).
• Provided first-line application support, troubleshooting and escalating as
needed.
• Monitored database backups and resolved performance issues.
• Managed FortiGate Network firewall and maintained Active Directory for user
management.

• Administered 300+ Windows and Linux servers in healthcare production; handled incidents, patching, and
maintenance windows.
• Provided first-line application support including triage, escalation, and resolution for clinical and operational systems.
• Monitored database backups and resolved performance bottlenecks to ensure data availability for healthcare
operations.
• Managed FortiGate Firewall rules and Active Directory for user provisioning, access control, and security compliance.