Senior Java Developer - Multithreading/caching - sought by leading investment bank based in London - Contract
*inside IR35 - umbrella*
Key Responsibilities
*Develop and maintain high-performance backend services for complex data processing workloads.
*Design scalable architectures for large-volume calculations and data pipelines.
*Work closely with cross-functional teams to define and deliver new features.
*Ensure optimal performance, quality, and reliability across backend services.
*Diagnose and resolve performance bottlenecks and defects.
*Follow best-practice engineering standards, design patterns, and architectural principles.
*Apply Test-Driven Development (TDD) in day-to-day development.
*Use static code analysis tools such as SonarQube to maintain clean, high-quality code.
*Work efficiently with SQL, data joins, and large/complex datasets.
*Leverage AI tooling to enhance productivity in coding and system design.
Required Skills & Experience
*8+ years’ experience in Java backend development (Java 17+).
*Degree in Computer Science, Software Engineering, or related field.
*Strong expertise in Java + Spring Boot / Spring Data / Spring Cloud.
*Excellent SQL knowledge and experience optimising queries and data models.
*Strong understanding of in-memory data loading and efficient join strategies.
*Deep familiarity with Java tooling (Maven/Gradle, testing frameworks, dependency management).
*Proven experience building data processing or data-intensive applications.
*Solid understanding of modern architectural patterns (Microservices, Event-Driven Architecture).
*Strong TDD skills and experience using static code analysis (e.g., SonarQube).
*Clear communication skills with the ability to explain technical concepts to varied audiences.
Nice to Have
*Cloud experience: AWS / Azure / GCP.
*Containerisation: Docker, Kubernetes.
*Distributed processing: Apache Spark / Flink.
Please apply within for further details - Matthew Holmes, Harvey Nash


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