Senior Oracle Administrator

About the Role

HCLTech is seeking a Senior Oracle Administrator with 8-10 years of experience for a full-time position. This role focuses on the administration of big data platforms, ensuring their optimal performance, security, and availability.

Key Responsibilities

• Deploy, configure, and upgrade Hadoop distributions such as Cloudera CDH, Hortonworks/DataPlane, or cloud-native equivalents.
• Set up and manage YARN, HDFS, Hive, Spark, HBase, ZooKeeper, Kafka, Oozie/Airflow, and related services.
• Implement multi-tenant resource pools and quota management.
• Build and maintain monitoring dashboards using tools like Cloudera Manager, Ambari, Grafana, and Prometheus for capacity, health, latency, and job failure alerts.
• Perform daily health checks, log analysis, and trend-based capacity planning.
• Optimize Hadoop cluster parameters, including block size, replication factor, YARN scheduler, and Spark executor settings.
• Tune Hive/Impala queries, Spark jobs, and HBase schema for banking workloads such as transaction-level reporting and fraud detection.
• Enforce authentication (Kerberos) and authorization (Apache Ranger, Sentry).
• Implement data in motion encryption (TLS), at rest encryption (HDFS transparent encryption), and audit logging.
• Collaborate with the Information Security team to meet PDPL, C Bank, and ISO 27001 audit requirements.
• Define and test backup strategies using tools like DistCp, snapshots, and cloud-based tiering.
• Manage disaster recovery (DR) replication, including Cloudera Replicated HDFS and MirrorMaker for Kafka.
• Develop reusable scripts (Bash, Python, PowerShell) or Ansible/Chef/Puppet playbooks for provisioning, patching, and routine maintenance.
• Automate data ingestion pipelines (Sqoop, Flume, NiFi) and job orchestration (Oozie/Airflow).
• Serve as a Tier 2/Tier 3 escalation point for big data incidents, owning end-to-end resolution and RCA documentation.
• Communicate impact, mitigation steps, and ETA to stakeholders via ServiceNow and the DR Slack channel.
• Partner with data engineering, data science, and business intelligence teams to provision environments, grant access, and resolve performance issues.
• Liaise with vendors (Cloudera, Hortonworks, AWS, Azure) for support tickets, licensing, and Proof of Concepts (POCs).
• Mentor junior administrators, conduct internal “Big Data Ops” workshops, and maintain run books on the secured SharePoint library.
• Contribute to the Data Platform community of practice through code reviews and best practice documentation.
• Identify opportunities for cost optimization, such as spot instance usage and tiered storage.
• Evaluate emerging technologies like Kubernetes-based data ops, Delta Lake, and Lakehouse architecture, and propose proof of concepts.

Qualifications and Experience

• A minimum of 8 to 10 years of experience in big data administration.
• Demonstrated experience with Hadoop distributions and related ecosystem components.
• Proficiency in scripting and automation tools.
• Strong understanding of security and compliance requirements in data platforms.

Work Type

This is a full-time position.

Application Process

Further details regarding the application process will be provided upon inquiry.