Job Description
A global Investment Bank is looking for a hands-on Cassandra Database Engineer to join a major Financial Crime technology programme.
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This is a key technical role within a high-profile transformation programme, where you'll help design and build the Cassandra/NoSQL data platform supporting the migration of data from an existing Oracle environment.
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Cassandra Database Engineer - Contract | London
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Location: London
Working pattern: Ideally 1 day per week in the office
Contract: Contract
Start: September 2026
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The Opportunity
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A global Investment Bank is looking for a hands-on Cassandra Database Engineer to join a major Financial Crime technology programme supporting a significant NICE Actimize IFM upgrade.
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This is a key technical role within a high-profile transformation programme, where you'll help design and build the Cassandra/NoSQL data platform supporting the migration of data from an existing Oracle environment.
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You'll have genuine ownership of the Cassandra architecture and will play a critical role in ensuring the platform is high-performing, resilient and production-ready.
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What You'll Be Doing
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- Design and implement Apache Cassandra architecture, including keyspaces, tables, partitioning and replication strategies.
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- Develop robust data models aligned to application query and transaction patterns.
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- Support the Oracle-to-NoSQL data migration and associated technical design.
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- Design for high availability, including active-active architecture, failover and disaster recovery.
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- Build, configure and operationalise Cassandra clusters.
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- Undertake performance tuning, capacity planning and production readiness activities.
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- Manage cluster operations including node additions/decommissions, repairs, backups and recovery.
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- Work closely with application, middleware, infrastructure, security and delivery teams.
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- Provide technical guidance on CQL and Cassandra best practices.
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- Produce technical documentation, operational runbooks and support knowledge transfer.
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- Work with internal teams and technology partners to ensure a successful delivery.
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What We're Looking For
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The priority is genuine, hands-on Cassandra expertise rather than someone who has simply worked alongside Cassandra.
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You should have strong experience with:
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- Apache Cassandra in production environments
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- Keyspace and table design
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- Data modelling and partition-key design
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- Replication factors and consistency
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- Cassandra architecture and configuration
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- Cluster operations and troubleshooting
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- Performance tuning and capacity planning
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- High availability, failover and disaster recovery
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- CQL and Cassandra internals
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- Linux administration and scripting
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Experience with technologies such as Oracle, Kafka, IBM MQ/IIB or NICE Actimize would be beneficial but is not essential.
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No Banking Experience Required
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This is a purely technical hire, so candidates from any industry are welcome.
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We're particularly interested in:
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- Experienced Cassandra engineers
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- NoSQL database specialists
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- DBAs who have developed strong Cassandra expertise
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- Data engineers who retain deep hands-on Cassandra knowledge
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- Engineers from other NoSQL technologies, particularly HBase/wide-column databases
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Broader NoSQL experience such as MongoDB may also be considered, although Cassandra experience is strongly preferred due to the immediate requirements of the programme.
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The Ideal Candidate
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You're someone who can operate as a technical authority - comfortable getting into the detail of Cassandra architecture while also working collaboratively with developers, infrastructure teams, vendors and senior stakeholders.
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Most importantly, you know Cassandra hands-on and can make sound architectural and operational decisions in a production environment.
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If you're an experienced Cassandra Engineer looking for a technically challenging contract where you can make a tangible impact, we'd be interested in speaking with you.
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London presence is preferred, with at least one day per week in the office. Some flexibility may be available for exceptional Cassandra specialists, subject to approval.
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Robert Walters Operations Limited is an employment business and employment agency and welcomes applications from all candidates
Cassandra Database Engineer in London employer: Robert Walters
Join a leading organisation in the UK property and infrastructure sector as a Legal Director - Construction and Development, where you will be part of a dynamic team that values collaboration and innovation. With a hybrid working model, competitive salary, and opportunities for professional growth, this role offers a unique chance to influence major projects while enjoying a supportive work culture that prioritises employee well-being and development. Located in Cheshire, you will benefit from a vibrant community and access to a wealth of resources in the construction and development field.
