Software Engineer - High-Performance Java / Low Latency

Randstad Technologies Recruitment; City Of London; Hybrid; GBP 111,000 - 221,000; Full time

Job summary

Randstad Technologies Recruitment is seeking a Software Engineer in London to develop high-performance Java and low-latency trading platforms. The role focuses on agency liquidity expansion with close collaboration across CRB, EMEA, and US teams in a hybrid London office.

The ideal candidate will have deep Java expertise, experience with JVM tuning, and knowledge of low-level optimizations, JNI, and memory profiling for ultra-low latency processing.

Qualifications

• Expertise in Java high-performance engineering and JVM internals.
• Experience with low-latency systems and memory profiling.
• Knowledge of event-driven and concurrent programming patterns.

Responsibilities

• Design, build, and optimize high-throughput, low-latency concurrent systems for agency liquidity expansion.
• Perform fine-grained JVM tuning, garbage collection (GC) optimization, and memory profiling to achieve ultra-low response times.
• Engineer low-level Java solutions utilizing JNI, Java Unsafe, or JNR-FFI for high-frequency processing.
• Collaborate across cross-functional engineering and risk teams to execute high-impact EMEA and US project deliverables.

Skills

Core Java & JVM

Low-Level Optimization

Architecture & Concurrency

Networking & OS Internals

Aeron (Nice-to-Have)

Tools

Aeron

Job description

Software Engineer - High-Performance Java / Low Latency

Role Type: Contract (Inside IR35)

Location: London, UK (Hybrid - 3 days per week in-office)

Overview

We are looking for a specialist High-Performance Java Engineer to join our team in London, focusing on the expansion of Agency Liquidity based on Principal Risk. In this role, you will work closely with CRB to drive key EMEA and US regional projects, developing low-latency, event-driven trading platforms.

Core Responsibilities

• Design, build, and optimize high-throughput, low-latency concurrent systems for agency liquidity expansion.
• Perform fine-grained JVM tuning, garbage collection (GC) optimization, and memory profiling to achieve ultra-low response times.
• Engineer low-level Java solutions utilizing JNI, Java Unsafe, or JNR-FFI for high-frequency processing.
• Collaborate across cross-functional engineering and risk teams to execute high-impact EMEA and US project deliverables.

Technical Requirements

• Core Java & JVM: Deep expertise in Java high-performance engineering, JVM internals, garbage collection strategies, and profiling.
• Low-Level & Hardware Optimization: Solid foundation in low-level Java APIs (Unsafe, JNI, JNR-FFI), CPU architecture, shared memory, and memory-mapped files.
• Architecture & Concurrency: Mastery of event-driven/reactive designs, multi-threading, concurrent programming patterns, and core Data Structures & Algorithms.
• Networking & OS Internals: Strong hands-on knowledge of networking protocols (TCP/UDP, low-latency socket programming) and Linux kernel/memory management.

Technical Nice-to-Have

• Hands-on experience with the Aeron messaging framework or similar ultra-low-latency messaging technologies.