Cassandra DBA

Zensar; Karnataka; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Zensar is seeking a Cassandra engineering expert to optimize performance, manage scalable clusters, and implement robust backup strategies. The role focuses on tuning JVM and OS settings, diagnosing latency and bottlenecks, and ensuring high availability across production Cassandra deployments.

You will work on node expansion, repair, streaming, and capacity upgrades, while leveraging nodetool, logs, metrics, and tracing tools to maintain healthy clusters.

Qualifications

• Experience tuning Cassandra performance and read/write latency.
• Proficient with compaction, caching, and tombstones.
• Ability to identify hot partitions and slow queries.
• Experience with cluster expansion and node decommissioning.
• Knowledge of backup and DR strategies for Cassandra.
• Strong JVM tuning and OS/storage optimization.

Responsibilities

• Analyze and optimize read/write performance and latency.
• Tune compaction, caching, consistency levels, tombstones, SSTables, and Cassandra configuration.
• Identify hot partitions, slow queries, and resource bottlenecks.
• Add, replace, remove, and decommission Cassandra nodes safely.
• Perform cluster expansion and capacity upgrades with minimal production impact.
• Manage token distribution, bootstrap/streaming, repair, cleanup, and cluster rebalancing.
• Implement and maintain Cassandra backup and restore strategies.
• Perform snapshots, incremental backups, and point-in-time recovery where supported.
• Tune Cassandra JVM heap, garbage collection, and memory settings.
• Troubleshoot GC pauses, heap pressure, CPU, disk I/O, and memory issues.
• Tuning Linux/OS and storage configurations for Cassandra workloads.
• Monitor cluster health, availability, latency, throughput, disk usage, and repairs.
• Troubleshoot production issues including node failures, high latency, timeouts, replica inconsistencies, and capacity problems.
• Strong experience with nodetool, Cassandra logs, metrics, tracing, and monitoring/alerting platforms.

Skills

Cassandra tuning

Cluster management

JVM tuning

Performance monitoring

Troubleshooting latency

Tools

nodetool

Metrics & tracing

Job description

Cassandra Performance Tuning

• Analyze and optimize read/write performance and latency.
• Tune compaction, caching, consistency levels, tombstones, SSTables, and Cassandra configuration.
• Identify hot partitions, slow queries, and resource bottlenecks.

Node Expansion & Cluster Management

• Add, replace, remove, and decommission Cassandra nodes safely.
• Perform cluster expansion and capacity upgrades with minimal production impact.
• Manage token distribution, bootstrap/streaming, repair, cleanup, and cluster rebalancing.

Backup & Recovery

• Implement and maintain Cassandra backup and restore strategies.
• Perform snapshots, incremental backups, and point-in-time recovery where supported by the backup solution.
• Conduct recovery testing and support disaster-recovery procedures.

JVM & System Tuning

• Tune Cassandra JVM heap, garbage collection, and memory settings.
• Troubleshoot GC pauses, heap pressure, CPU, disk I/O, and memory issues.
  • Tune Linux/OS and storage configurations for Cassandra workloads.

Monitoring & Troubleshooting

• Monitor cluster health, availability, latency, throughput, disk usage, compactions, dropped messages, GC, and repairs.
• Troubleshoot production issues including node failures, high latency, timeouts, replica inconsistencies, and capacity problems.
• Strong experience with nodetool, Cassandra logs, metrics, tracing, and monitoring/alerting platforms.

At Zensar, we’re
"experience-led everything". We are committed to conceptualizing, designing, engineering, marketing, and managing digital solutions and experiences for over 130 leading enterprises. We are a company driven by a bold purpose:
Together, we shape experiences for better futures. Whether for our clients, our people, or the world around us, this belief powers everything we do. At the heart of our culture is
ONE with Client - a set of four core values that reflect who we are and how we work:
One Zensar, Nurturing, Empowering, and Client Focus.
Part of the $4.8 billion RPG Group, we’re a community of 10,000+ innovators across 30+ global locations, including Milpitas, Seattle, Princeton, Cape Town, London, Zurich, Singapore, and Mexico City. Explore Life at Zensar and join us to Grow. Own. Achieve. Learn. to be the best version of yourself.
We believe the best work happens when individuality is celebrated, growth is encouraged, and well-being is prioritized. We are an equal employment opportunity (EEO) and affirmative action employer, committed to creating an inclusive workplace. All qualified applicants will be considered without regard to race, creed, color, ancestry, religion, sex, national origin, citizenship, age, sexual orientation, gender identity, disability, marital status, family medical leave status, or protected veteran status.