Data Test Engineer (Banking, Kafka, MongoDB, API, Migration) at Deloitte, London, to 12/26, £Contract Rate

Data Test Engineer - (Banking, Kafka, MongoDB, API, Migration)

Rate: Competitive Inside IR35

Contract Start - Immediate

Contract End - December 2026

Location: London (2/3 days Hybrid)

** Must have experience within the Banking industry **

We are seeking a skilled Data Test Engineer to join our team responsible for validating the quality, reliability, and performance of Direct-to-Consumer (D2C) Reporting APIs delivered on the Operational Data Store (ODS) platform. This role is critical in ensuring robust and accurate data processing through comprehensive testing of Java-based APIs, event-driven streaming pipelines, and data persistence layers.

Key Responsibilities

• Design, develop, and execute functional, integration, and non-functional tests for D2C Reporting APIs.
• Validate data accuracy and event flows within event-driven streaming pipelines using Kafka, Flink, and Kafka Streams.
• Test data persistence and integrity in MongoDB databases.
• Implement automated testing frameworks and quality controls to support production readiness.
• Collaborate with development and operations teams to ensure seamless deployment and performance on OpenShift platform.
• Identify, document, and track defects and issues, ensuring timely resolution.
• Contribute to continuous improvement of testing processes and tools.

Required Skills and Experience

• Must have proven experience within the Banking industry.
• Strong experience testing Java-based APIs.
• Strong knowledge of event-driven streaming technologies such as Kafka, Flink, and Kafka Streams.
• Experience with data persistence testing in MongoDB.
• Familiarity with automated testing tools and frameworks.
• Experience working with containerized environments, preferably OpenShift or Kubernetes.
• Ability to design and execute comprehensive test plans covering functional, integration, and non-functional aspects.
• Strong analytical skills with attention to detail in validating data accuracy and event flows.
• Excellent communication and collaboration skills.

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