Developer - Java, JVM Tuning (Low Latency)

OneAPPS Consulting; Greater London; On-site; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Aeron experience preferred

Job summary

OneAPPS Consulting in London is seeking a high-performance Java developer focused on JVM tuning for low-latency environments. You will optimize GC, design event-driven and reactive systems, and leverage low-level Java utilities such as Unsafe, JNI, and JNR-FFI to manage off-heap memory.

Strong data structures, algorithms, and understanding of CPU architecture, memory management, and Linux internals are essential. Experience with Aeron is highly desired.

Qualifications

• Advanced Java mastery with GC optimization and JVM tuning.

Responsibilities

Skills

Advanced Java

JVM Tuning

Data Structures and Algorithms

Event-driven and Reactive Systems

Concurrency

TCP/UDP Networking

CPU Architecture

Memory Management

Linux Internals

Tools

Java Unsafe

JNI

JNR-FFI

Job description

OneAPPS Consulting (www.oneapps.com) is a Technology consulting firm based out of London and offices across Europe. We are working on various projects involving diverse, multicultural teams with clients across the Europe. We are an invaluable partner and our teams have collaborated to support the growth of our clients. With more than 7 locations worldwide we help our clients to deliver their projects smoothly. We look forward to getting to know you and working with you.

Role: Developer - Java, JVM Tuning (Low Latency)

Location: London, UK

Key Requirements & Skills

• Advanced Java Mastery: Exceptional high-performance Java skills, including deep expertise in JVM Tuning and garbage collection (GC) optimization.
• Core Fundamentals: Strong foundation in complex Data Structures and Algorithms.
• System Architecture: Proven experience building event-driven and reactive systems operating in low-latency, high-frequency environments.
• Low-Level Java Utilities: Practical expertise utilizing low-level mechanisms such as Java Unsafe, JNI, JNR-FFI, and off-heap memory.

Technical Expertise

• Concurrency & Networking: Excellent knowledge of multi-threaded programming, concurrency models, and standard networking protocols (TCP/UDP).
• Hardware & OS Proximity: Solid understanding of CPU Architecture, mechanical sympathy, and Memory Management (including Shared Memory and Memory Mapped files).
• Linux Internals: Deep understanding of Linux operating system internals, kernel bypass, or OS-level performance tuning.

Nice to Have

• Production experience with Aeron (highly preferred).

If this role sounds like you, we invite you to apply. Thanks.