| Key responsibilities | Linux Administration - Install, configure, administer, patch, upgrade and troubleshoot RHEL and Oracle Linux servers.
- Manage Linux systems across physical, VMware and cloud environments, including users/groups, sudo, SSH, systemd, cron, DNS, NTP and network configuration.
- Administer file systems, LVM, NFS, SAN/NAS connectivity and multipathing; troubleshoot CPU, memory, disk I/O, kernel and network issues.
- Perform OS hardening, vulnerability remediation, package/repository management using YUM/DNF and capacity planning.
- Develop Bash/Shell automation for health checks, operational tasks and reporting.
Oracle Database Administration - Install, configure, administer, patch, upgrade and troubleshoot Oracle databases, including supported enterprise versions such as 12c/19c and later.
- Manage instances, schemas, users, roles, privileges, tablespaces, listeners, initialization parameters and database storage.
- Monitor and tune SQL performance using AWR, ASH, ADDM, Explain Plan, SQL Trace, wait events, SGA/PGA and session analysis.
- Manage RMAN backup, restore and recovery, database cloning/refresh, migrations and point-in-time recovery.
- Configure and support Data Guard, replication, DR architectures, ASM and RAC environments where applicable.
- Plan and execute Oracle Release Updates/security patching and troubleshoot archive log, corruption, storage and recovery issues.
PostgreSQL Database Administration - Install, configure, administer, patch, upgrade and troubleshoot PostgreSQL databases and clusters.
- Manage roles, privileges, schemas, tablespaces, extensions and configuration files including postgresql.conf and pg_hba.conf.
- Tune queries, connections, memory, locks, transactions, indexes, checkpoints, autovacuum and database/storage growth.
- Manage pg_dump/pg_restore, pg_basebackup, WAL archiving and Point-in-Time Recovery.
- Configure and support streaming replication and HA solutions such as Patroni, repmgr or equivalent where implemented.
- Perform major/minor upgrades, migrations, refreshes and troubleshoot replication lag, deadlocks, blocking and table/index bloat.
Microsoft SQL Server Administration - Install, configure, administer, patch, upgrade and troubleshoot Microsoft SQL Server databases.
- Manage databases, logins/users, permissions, database files, TempDB, SQL Agent jobs and maintenance activities.
- Configure and support Always On Availability Groups, Failover Cluster Instances, log shipping and replication where applicable.
- Manage full, differential and transaction-log backups and point-in-time recovery.
- Monitor and troubleshoot blocking, deadlocks, CPU/memory pressure, disk latency, waits and long-running queries.
- Perform query tuning, index/statistics management, SQL Server cumulative updates and integration with Active Directory authentication.
Backup, Recovery & Disaster Recovery - Define and maintain database backup standards, retention, restore procedures and recovery runbooks.
- Coordinate with enterprise backup teams and regularly validate restore capability for Oracle, PostgreSQL and SQL Server.
- Participate in DR drills and validate RPO, RTO, replication status and application-consistent recovery.
Performance, Capacity & Availability - Proactively monitor Linux and database performance across CPU, memory, disk, storage latency, network and SQL workloads.
- Perform capacity forecasting for database growth, tablespaces, file systems, transaction logs, WAL/archive logs and infrastructure resources.
- Work with application teams to optimize SQL and recommend scaling or configuration improvements.
Security, Compliance & Lifecycle - Implement Linux/database hardening, least-privilege access, privileged/service account reviews and vulnerability remediation.
- Plan and execute Linux patching, Oracle Release Updates, PostgreSQL updates and SQL Server Cumulative Updates.
- Track end-of-support versions and develop upgrade/migration plans; support audit evidence and compliance closure.
Monitoring, Incident & Problem Management - Configure proactive monitoring and alerts for availability, resource utilization, storage capacity, replication, backup failures, locks and database growth.
- Own troubleshooting of P1/P2 production incidents, perform RCA and drive corrective/preventive actions.
- Participate in on-call support for business-critical production systems.
Automation, Change & Documentation - Automate repeatable activities using Bash/Shell, SQL, PL/SQL and PowerShell; Python/Ansible exposure is desirable.
- Follow ITIL change management, prepare implementation/rollback/validation plans and participate in CAB as required.
- Maintain server/database inventory, architecture/topology diagrams, SOPs, runbooks, backup/DR procedures, patch schedules and capacity reports.
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| Skills and Competencies | - Strong hands-on Linux administration: RHEL / Oracle Linux, LVM, multipathing, NFS, SAN/NAS, systemd, SSH, TCP/IP, DNS, NTP and Shell scripting.
- Strong Oracle DBA skills: RMAN, Data Guard, AWR/ASH/ADDM, SQL tuning, patching, recovery, ASM; RAC knowledge preferred.
- Strong PostgreSQL skills: streaming replication, WAL, PITR, pg_dump/pg_restore, pg_basebackup, Vacuum/Autovacuum, query optimization and upgrades.
- Strong Microsoft SQL Server skills: Always On, backup/recovery, SQL Agent, performance tuning, indexes/statistics, blocking/deadlock analysis and patching.
- Good understanding of VMware, storage, enterprise backup, Active Directory, networking, high availability, disaster recovery and cloud infrastructure.
- Strong troubleshooting, analytical thinking, ownership, documentation, stakeholder communication and vendor coordination.
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