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
