Senior Java Backend Developer (Contract)

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.

The Role

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

Required Experience

• 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

Desirable Experience

• 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

Additional Information

• Daily rate: £850 - £900
• Hybrid working model in London
• Initial contract with strong likelihood of extension

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