Ponselvan Mayandi

Project 1: [Mar 2025 to till date]

Client: UHG - Optum

Role: Azure DevOps Engineer

Responsibilities:

• Designed and implemented end-to-end CI/CD pipelines in GitHub Actions for Azure Web Apps, Functions, Container Apps, and AKS.
• Created reusable workflows and organization-wide pipeline templates to standardize CI/CD across teams.
• Set up environment-specific approvals, deployment gates, and secrets management using GitHub Environments and Azure Key Vault.
• Troubleshot workflow failures, analyzed logs, and enabled insights/monitoring for pipeline reliability.
• Implemented code scanning, container image scanning, and dependency checks using CodeQL.
• Automated artifact builds and publishing to ACR, GitHub Packages, and Azure Artifacts.
• Ensured compliance with organizational security & governance policies through Azure Policy, RBAC, and Key Vault integration.
• Provided post-deployment support, training & knowledge transfer sessions to Developers and DevOps teams.

Project 2: [Oct 2022 to Mar 2025]

Client: Telstra Limited

Roles: Azure DevOps/SRE, Data Platform Engineer, Migration Specialist

Responsibilities:

• Data Platform Team operates on various layers ranging from BigData Hadoop platform, Kubernetes, Docker/Container Management, Private cloud, Infrastructure in Datacentre, CICD pipeline to various Project applications.
• Acted as Engagement Lead & working among the 7 managed operations Bigdata Platform Team end to end applying ITIL framework.
• Performed Kubernetes administration tasks on the DEV & PROD environments such as user onboarding, Namespace creation, cluster expansion, adding/removing workers to perform the patching activity.
• Managed various distribution of Hadoop clusters (Hortonworks, CDP & MapR), Apache NiFi, Cassandra, Kafka Cluster & NetApp StorageGRID/AFF Cluster operations.
• Handled Kafka brokers installation & configuration, topic creation & access provisioning.
• Performed various certificate renewals in the platform which involves host level & application level using OpenSSL & Keytool utility.
• Performed NetApp Storage GRID version upgrade & disk firmware upgrade.
• Coordinated with vendors during any replacement or failures of the parts like NetApp compute controller, Hard Disk & PSU's.
• Performed Critical Vulnerability Assessment on Atlassian Bitbucket, Eclipse/Jetty servers.
• Analyse the performance of the clusters, suggest optimizations & fine-tune the clusters.
• Led the end-to-end migration of 50+ microservices from Pivotal Cloud Foundry (PCF) to Microsoft Azure Container Apps (ACA) & Azure Kubernetes Service (AKS).
• Developed & maintained GitLab CI/CD pipelines to automate Docker image creation & deployment to Harbor registry using Maven/Gradle for Java-based microservices
• Automated application deployment workflows using Azure DevOps Pipelines & YAML-based configurations for all environments (Dev, QA, UAT, Prod).

• Client: Standard Chartered Bank Role: Lead DevOps – BI Tools–Dataiku & Dremio Responsibilities:
• As a part of Engineering Team, accountable for providing Development/L3 support for Hadoop & BI Tools integration.
• Responsible for managing several Dataiku DSS instances in DEV/SIT/QA
• Involved in Python scripting for Dataiku user onboarding & other automation processes.
• Experience in building Data pipeline in Dataiku
• Installing & configuring Dataiku, Dremio applications on Hadoop Edge node
• Managing user and group impersonation rules for multiuser security
• Managing create modify code environments (Python & R-code environments)
• Monitoring Dataiku & Dremio jobs and resolve bottlenecks and provide best practices and guidelines to users.
• Worked on Dataiku DSS version upgrade (8.1.0->8.2.0->9.0.7->10.0)
• Working with database administrators for troubleshooting performance issues if any, using Hive/Hadoop tools effectively to troubleshoot issues on database end.
• (India-Remote)

• Client: IMS Shared Services Role: Senior System Engineer Responsibilities:
• Responsible for installing, configuring, supporting & managing Hadoop Clusters using Apache Ambari & Cloudera Manager
• Responsible for managing several Hadoop Clusters in DEV, QA & PROD environment.
• Worked on HDP (2.6.5) to CDP (7.1.2/3/4) migration in DEV, QA & PROD environment.
• Implementing High Availability for HDFS & YARN and configuring automatic failover.
• Balancing the roles on the instances. Configuring and Managing YARN queues
• Monitoring CPU, RAM, Disk usages and network connectivity in the clusters, managing and reviewing Hadoop log files, Configuring Alerts & checking Events.
• Troubleshooting failed Services & Jobs issues by reviewing logs
• Fixing regular issues like Alerts, user access, permission, ACL, connection failure, file limits, memory swapping & cluster load
• Accountable for Creating, scheduling, reviewing & Implementing Changes on 2000+ Linux boxes. Patching and package administration
• Through ECR Fixing Boot issues, Server panic, Application Slowness, Network failure, Hardware failure and File System issues which impacts the production.
• NFS mount, SSH and memory capping configuration and troubleshooting.
• Regular DR activities for critical production servers.

• Client: Toyota-Kirloskar Motor (P) Ltd Role: Linux System Administrator Responsibilities:
• Installation, Configuration & Administration of RedHat 5 & 6
• Package installation using RPM's & YUM repositories.
• User & Group administration
• LVM File system creation/extension and troubleshooting
• Scheduling & Monitoring Crontab jobs to update the data on time.
• System monitoring CPU, Disk, Memory utilization etc.
• Performance issue troubleshooting (swap, load etc.,)
• Regular maintenance, patching & reboot request handling.
• Escalating to L3 support team if any critical issue found during the health checks.
• Installing, Configuring, Administering & Supporting WAS V6.1/7.0, IBM HTTP Server, Apache & Nginx on RHEL 6/7
• Deploying Enterprise Applications (EAR, WAR, JAR) in PROD/QA/DEV Environment using Scripts/Manual deployment methods