Senior System Engineer

20 hours ago

Chennai India EPAM Systems Full time

Job Description We are seeking a highly skilled Senior System Engineer - PostgreSQL DBA to join our team. This role offers the opportunity to work on mission-critical database environments and contribute to the evolution of our data infrastructure. You will collaborate with experts across multiple disciplines to deliver reliable and scalable solutions. Responsibilities - Architect, configure, and manage complex PostgreSQL environments, including clustering, replication, and distributed setups - Lead major version upgrades, migrations between on-premises and cloud platforms, consolidation efforts, and patch management - Design and implement high-availability and disaster recovery solutions using streaming replication, logical replication, and failover technologies - Perform advanced performance tuning through EXPLAIN ANALYZE, query plan optimization, index management, and parameter adjustments - Develop and refine backup and restore strategies using pgBackRest or enterprise-grade tools - Analyze transaction bottlenecks, lock contention, vacuum overhead, WAL tuning, and address large-scale performance challenges - Plan and execute capacity forecasting and recommend scalability improvements - Ensure database security, encryption, credential rotation, and audit compliance - Collaborate with development teams on schema design, stored procedures, functions, and data model optimization - Review and validate database deployment plans, participate in Change Advisory Board meetings, and support smooth release processes - Create and maintain architecture diagrams, best practices, standards, and technical documentation - Lead automation initiatives using scripting, configuration management, and DevOps methodologies - Mentor L2 DBAs and provide technical leadership during major incidents Requirements - 6 to 10 years of hands-on experience as a PostgreSQL DBA in enterprise environments - Comprehensive understanding of PostgreSQL internals, including WAL behavior, vacuum and autovacuum tuning, MVCC, indexing strategies, and partitioning - Expertise in replication technologies such as streaming, logical, and cascading replication, as well as failover management and disaster recovery architectures - Advanced performance tuning abilities using logs, performance views, system statistics, and query plan analysis - Extensive experience with pgBackRest, point-in-time recovery (PITR), troubleshooting restores, and managing recovery scenarios - Proficiency in Linux administration and scripting with Shell or Python for automation and operational tasks - Proven track record in leading major incidents, migrations, and architectural discussions - Working knowledge of at least one other RDBMS, such as Oracle, MS SQL, MySQL, or MongoDB - Strong communication skills and ability to collaborate effectively across cross-functional teams - Fluent English skills (written and spoken) at a B2+ level or higher Nice to have - Experience with cloud-native PostgreSQL platforms, including AWS Aurora, RDS PostgreSQL, GCP Cloud SQL, or Azure - Knowledge of PostgreSQL extensions such as PostGIS, pg_partman, TimescaleDB, or pg_stat_statements - Hands-on experience with high-availability tools like Patroni, repmgr, Pacemaker, or Corosync - Familiarity with CI/CD pipelines for database deployments - Background in managing large-scale OLTP or OLAP PostgreSQL systems - PostgreSQL or EDB certifications

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