Senior Java Engineer (JVM)

Hazelcast; United Kingdom; Remote; GBP 80,000 - 100,000; Full time

Job summary

A technology company in the UK is looking for a Senior Java Engineer. You'll design and maintain core components of their platform, implementing distributed algorithms and optimizing performance. Ideal candidates should have strong Java skills and experience with concurrency. Benefits include annual leave, private medical and dental insurance, and a company pension plan.

Benefits

25 days Annual Leave + Bank Holidays + Quarterly Wellbeing Days

Group Company Pension Plan

Private Medical Insurance

Private Dental Insurance

Life Insurance

Employee Assistance Program

Qualifications

• Pragmatic engineer with deep interest in Java performance.
• Pride in building reliable, fast, and well-understood software.

Responsibilities

• Design, develop and maintain key parts of the Hazelcast Platform.
• Implement distributed algorithms for high availability and fault tolerance.
• Profile and optimise critical paths for throughput and latency.
• Collaborate across teams to define architecture and deliver high-quality software.
• Continuously learn advancements in JVM internals and distributed systems.

Skills

Strong command of Java and JVM internals

Deep understanding of Java concurrency

Hands-on experience with concurrency and distributed systems

Proven ability to debug complex multi-threaded systems

Solid understanding of storage internals

Job description

Senior Java Engineer (JVM)

Department: Software Engineering

Employment Type: Permanent - Full Time

Location: Remote, UK

Description

We are looking for a Senior Java Engineer, experienced in JVM, concurrency, networking, strong consistency and data storage to join our Core team. The team focuses on the Hazelcast Platform, our high-performance low-latency storage and stream processing engine that operates at scale. Enabling Real-Time business event processing to meet the most demanding customer needs.

Day to day, you’ll be leveraging your solid engineering fundamentals with a focus on performance, consistency, resilience and scale, bringing your passion for solving difficult problems to help realize the product vision.

Your role as a Java Engineer is crucial in ensuring that Hazelcast Platform meets business objectives, is robust and scalable, and is depended upon by customers for mission-critical implementations.

WHAT YOU'LL DO

Design and Build Core Components
Design, Develop and maintain key parts of the Hazelcast Platform. Apply deep knowledge of the JVM to build efficient, reliable and scalable solutions.

Implement Distributed Algorithms
Use distributed systems fundamentals to deliver strong consistency, high availability and fault tolerance across the platform.

Performance Engineering
Profile and optimise critical paths for throughput, latency and memory usage. Apply advanced techniques such as lock-free data structures, efficient serialization and garbage collection tuning.

Collaborate Across Teams
Work closely with engineers, product managers and QA to define architecture, align priorities and deliver high-quality software. Share knowledge and elevate team capability through mentoring, code reviews and tooling.

Stay Sharp
Continuously learn and apply the latest advancements in JVM internals, distributed systems and performance engineering to push the boundaries of what our platform can do.

WHAT YOU HAVE

You’re a pragmatic engineer with a deep interest in Java performance and systems. You take pride in building reliable, fast and well-understood software, and you’re comfortable navigating the complexity of distributed data systems.

Must-Have Experience

• Strong command of Java and JVM internals (eg. garbage collection, JIT compilation, memory layout, classloading)
• Deep understanding of Java concurrency and the Java Memory Model
• Hands-on experience with concurrency, parallelism and distributed systems
• Proven ability to debug and optimise complex, multi-threaded systems in production
• Solid understanding of storage internals, caching, indexing and I/O behavior

Nice-to-Haves

• Experience with Hazelcast or low-level storage engines
• Familiarity with observability tools like JFR, async-profiler or perf
• Contributions to open-source projects related to the JVM or distributed systems

Job Benefits

• 25 days Annual Leave + Bank Holidays + Quarterly Wellbeing Days
• Group Company Pension Plan
• Private Medical Insurance
• Private Dental Insurance
• Life Insurance
• EAP (Employee Assistance Program)

LOCATION

Fully Remote within UK&I, with access to a City of London based office.