We are seeking an experienced Database Administrator (DBA) to manage, maintain, and optimize MariaDB, PostgreSQL, and Cassandra database platforms. The ideal candidate will ensure high availability, performance, security, and scalability of databases supporting mission-critical applications. 

Key Responsibilities 

Database Administration: 

• Install, configure, upgrade, and maintain MariaDB, PostgreSQL, and Apache Cassandra databases 

• Perform database capacity planning, performance tuning, and optimization 

• Monitor database health, replication, clustering, and availability 

Backup, Recovery & High Availability: 

• Design and manage backup and recovery strategies (logical & physical backups) 

• Implement and manage replication, clustering, and failover solutions 

• Perform disaster recovery planning and regular DR drills 

Security & Compliance: 

• Manage database security: users, roles, privileges, encryption, and auditing 

• Apply security patches and upgrades in compliance with company policies 

• Ensure compliance with data protection and regulatory standards 

Performance & Troubleshooting: 

• Diagnose and resolve database performance issues and outages 

• Analyze slow queries, locks, and resource bottlenecks 

• Provide root cause analysis (RCA) for incidents 

Automation: 

• Automate routine DBA tasks using scripts (Shell, Python, etc.) 

• Support containerized and cloud-based database deployments (if applicable) 

Documentation & Support: 

• Maintain database documentation, SOPs, and operational runbooks 

• Provide on-call support for production database environments 

• Assist developers with schema design, indexing, and query optimization 

Required Skills & Qualifications: 

Technical Skills: 

• Strong hands-on experience with MariaDB / MySQL, PostgreSQL, and Apache Cassandra 

• Expertise in: 

• Replication & clustering (Galera, PostgreSQL streaming replication, Cassandra clusters) 

• Backup & recovery tools (mysqldump, pg_dump, pg_basebackup, nodetool, etc.) 

• Performance tuning and query optimization 

• Experience with Linux systems and shell scripting 

• Knowledge of monitoring tools (Prometheus, Grafana, Zabbix, Nagios, etc.) 

Database Concepts: 

• ACID vs BASE principles 

• OLTP and distributed database architectures 

• Data modeling for relational and NoSQL databases