Senior Java Developer - Multithreading/Caching

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