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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