Senior Java Software Engineer

Overview

Job Title: Senior Java Engineer – Low Latency Systems

Location: London - 2 days onsite - six month contract - Outside IR35 - Up to £500 day rate

We’re looking for a Senior Java Engineer with a passion for low-level, high-performance systems. If you enjoy squeezing out every microsecond of efficiency and building high-throughput, scalable applications, this could be your next immediate move.

• Design, build, and optimise low-latency Java applications to support high-performance systems
• Work on high-throughput, scalable backend systems
• Tackle complex engineering problems that require deep knowledge of Java internals and system-level behavior
• Collaborate with cross-functional teams and clearly communicate technical concepts
• Contribute to the architecture and implementation of performance-critical features

• Proven experience as a Senior Java Engineer, particularly with low-level, high-performance Java
• Must come from a streaming services background
• Strong background in low-latency systems and high-throughput architectures
• Excellent problem-solving and communication skills
• A genuine passion for performance tuning, JVM optimisation, and digging deep into technical challenges others might overlook

• Familiarity with Hazelcast or other distributed in-memory computing platforms
• Knowledge of audio streaming/encoding and byte analysis techniques