Senior Java Software Engineer

Senior Backend Java Engineer (Contract)

Location: Redhill, UK (Hybrid – 3 days onsite)

Duration: 6 months

Rate: Up to £510 per day (Inside IR35)

We are looking for an experienced Senior Backend Java Engineer to join a high-performing team working on a large-scale streaming platform. This role involves designing and delivering high-throughput, event-driven microservices in a modern cloud-native environment.

You will play a key role in building scalable backend systems, applying advanced microservices design patterns, and optimising data performance across distributed systems.

Key Responsibilities

• Design and develop scalable microservices using Java and Spring Boot
• Implement event-driven architecture and microservices design patterns such as Saga, CQRS, and Event Sourcing
• Build and integrate GraphQL APIs
• Optimise MongoDB performance including aggregations, indexing, and query tuning
• Implement real-time processing using MongoDB Change Streams
• Develop asynchronous workflows using AWS SNS and SQS
• Deploy and manage services in AWS ECS
• Continuously improve system performance, scalability, and reliability

Required Skills

• Strong experience with Java (17+) and Spring Boot
• Proven background in distributed microservices architecture
• Hands-on experience with GraphQL APIs
• Strong MongoDB expertise including performance tuning and Change Streams
• Experience with AWS services such as SNS, SQS, and ECS
• Understanding of distributed caching

Desirable Skills

• Experience with high-traffic or streaming platforms
• Exposure to Kafka or Kinesis
• Familiarity with Docker, Kubernetes, or containerised environments
• Knowledge of observability tools such as Prometheus, Grafana, or ELK
• Strong communication and collaboration skills

This is an excellent opportunity to work on complex, large-scale systems in a fast-paced and innovative environment.