Java Developer

Location: London (Hybrid)Rate: £850 - £900 per day (likely inside IR35)

A leading global financial institution is seeking a Senior Java Backend Developer to join a high-performing engineering team, delivering scalable, data-intensive backend systems that support critical business functions.

This is a hands-on contract role focused on building and optimising high-performance applications designed to handle large and complex datasets within a distributed environment.

You will be responsible for designing, developing, and enhancing backend services that underpin data processing and analytical workflows.

Key responsibilities include:

• Developing high-performance Java-based backend services

• Designing and implementing scalable data processing architectures

• Working with large and complex datasets, ensuring performance and efficiency

• Contributing to system design, including microservices and event-driven architectures

• Writing clean, maintainable code aligned to best engineering practices

• Applying Test-Driven Development (TDD) and ensuring code quality

• Identifying and resolving performance bottlenecks

• Strong experience in Java backend development (Java 17+)

• Proven expertise with the Spring ecosystem (Spring Boot and related frameworks)

• Strong SQL and data modelling capabilities

• Experience working on data-intensive or high-throughput systems

• Solid understanding of microservices and event-driven architecture

• Experience applying TDD and modern software engineering practices

• Experience with messaging technologies such as Kafka

• Exposure to cloud platforms (AWS, Azure, or GCP)

• Familiarity with containerisation technologies (Docker, Kubernetes)

• Experience with distributed data processing tools such as Spark or Flink

• Daily rate: £850 - £900

• Hybrid working model in London

• Initial contract with strong likelihood of extension

McGregor Boyall is an equal opportunity employer and do not discriminate on any grounds.