Senior QA Engineer / SDET (Java, Spring Boot, API & Integration Testing)

We are looking for a highly technical Senior QA Engineer / Software Development Engineer in Test (SDET) to join a team building and supporting complex, business-critical trading systems.

This is not a traditional UI automation role. We are looking for someone who enjoys working closely with developers, can confidently test backend services, and has strong hands-on experience with Java, Spring Boot, API automation, service mocking, and integration testing.

What You'll Be Doing

• Designing and implementing automated tests for Java/Spring Boot applications
• Building and maintaining API and integration test frameworks
• Testing complex workflows across multiple services and systems
• Creating and using mocks/stubs to test services in isolation
• Validating business logic, data flows, and system integrations
• Working closely with developers during the development lifecycle
• Supporting CI/CD pipelines and shift-left testing practices
• Contributing to test strategy and automation improvements
• Ensuring quality across highly regulated financial platforms

What We're Looking For

Essential Technical Skills

• Strong hands-on Java experience
• Experience testing Spring Boot applications
• Excellent knowledge of:
• JUnit/TestNG
• Cucumber BDD
• REST Assured
• Strong API and integration testing experience
• Experience testing complex backend services and distributed systems
• Experience with service mocking and virtualisation using:
• Mockito
• WireMock
• MockServer
• or similar tools
• Strong SQL and database validation skills
• Experience working within CI/CD environments

Ideal Experience

• Testing microservices architectures
• Event-driven systems and messaging technologies (Kafka, RabbitMQ, etc.)
• Contract testing (PACT or similar)
• Spring Boot Test / MockMvc
• TestContainers
• Docker and Kubernetes
• Cloud platforms (AWS, Azure or GCP)

Domain Experience

We're particularly interested in candidates who have experience within:

• Trading platforms
• Market infrastructure
• Financial exchanges
• Investment banking
• Payments and fintech
• Regulatory reporting or risk systems

What Makes Someone Successful in This Role?

• You'll likely be successful if you can confidently discuss:
• Testing Spring Boot services
• Writing Java-based automated tests from scratch
• Mocking dependent services using Mockito or WireMock
• Integration testing across multiple systems
• Designing automation frameworks
• Validating business-critical workflows and complex data flows
• Solving technical problems without relying solely on UI automation