Cassandra Database Engineer (NoSQL)

London

Hybrid (3 days in the office / 2 WFH)

6-month contract

£706 per day (via Umbrella)

cer Financial are partnering with a leading international bank, based in London, who are looking to bring on an experienced Cassandra Database Engineer (NoSQL) for an exciting 6-month contract opportunity.

Responsibilities:

1. Cassandra Cluster Management: Design, implement and maintain Apache Cassandra clusters, including keyspaces, replication and partitioning.
2. Data Modelling: Develop and optimise data models based on query patterns, with a focus on partition keys, denormalisation and avoiding hotspots/wide partitions.
3. Performance Optimisation: Tune compaction, consistency levels, read/write performance and JVM/GC settings.
4. Cluster Operations: Manage node additions/decommissions, repairs, backups and disaster recovery.
5. Monitoring: Monitor Cassandra cluster health using Prometheus/Grafana, OpsCenter or equivalent tools.
6. CQL Support: Develop and optimise CQL queries and advise application teams on best-practice access patterns.
7. Security & Infrastructure: Work with infrastructure and security teams on hardening, encryption and authentication/authorisation (RBAC).
8. Technical Documentation: Create and maintain data models, runbooks and operational procedures.

Experience:

1. 4–9 years’ experience in NoSQL/Cassandra database engineering within production environments.
2. Strong Apache Cassandra & CQL expertise, including data modelling, replication, consistency and performance tuning.
3. Hands-on experience with cluster operations, backups, repairs, disaster recovery and capacity planning.
4. Strong Linux and Bash/Python scripting skills.
5. Financial services/regulatory experience with knowledge of security, encryption and RBAC.
6. Exposure to Kafka, IBM MQ/IIB, Actimize or Oracle PL/SQL is desirable.
7. Cloud/Cassandra certifications are a plus.
8. Comfortable working in Agile, cross-functional environments with strong stakeholder management skills.