Java jobs in United Kingdom

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 and enables real‑time business event processing for demanding customer needs.

• Design and Development
  • Design, develop, and maintain Java‑based consistency and storage components, leveraging RAFT and other distributed algorithms.
  • Implement new solutions using Java frameworks and libraries, ensuring scalability, performance, and reliability.
  • Optimize the platform for speed, efficiency, and resource utilization, including indexing, query optimisation, and caching strategies.
• Security and Integration
  • Implement security measures to protect data integrity and confidentiality, including encryption, access control, and compliance with relevant regulations.
  • Integrate storage components with other software infrastructure, such as SQLite, RocksDB, or cloud solutions.
• Monitoring and Maintenance
  • Monitor the system for performance issues, errors, and potential failures, and implement maintenance procedures such as backups, data recovery, and disaster recovery plans.
  • Troubleshoot issues related to data storage, including performance bottlenecks, data corruption, or compatibility issues with other software components.
• Collaboration
  • Work with cross‑functional teams, including software developers, architects, and product managers, to ensure effective integration and operation of the components within the overall software infrastructure.
• Documentation
  • Document design decisions, implementation details, and operational procedures to facilitate collaboration among team members and ensure maintainability of the system.
• Continuous Learning
  • Stay updated with the latest developments in storage technologies, Java programming language, and software engineering best practices, and apply this knowledge to improve existing storage systems and develop new solutions.

• Experience in Java development
• Strong Java Virtual Machine (JVM) experience: internals, memory management, garbage collection, performance optimisation
• Knowledge of networking, distributed systems, data structures and consistency algorithms
• Java JDK 17+
• Desirable knowledge of data serialization and transport (gRPC, shared memory, Protobuf)
• Experience with distributed data stores (MongoDB, ElasticSearch, Hadoop, CockroachDB)
• API design (well‑crafted APIs supporting backward compatibility)
• In‑memory data stores (SQLite, RocksDB)
• Popular Java frameworks (Spring, Hibernate)
• Performance benchmarking
• Bachelor’s degree in Computer Science or a related discipline, or equivalent experience

• 25 days annual leave + bank holidays
• Group company pension plan
• Private medical insurance
• Private dental insurance
• Life insurance
• EAP (Employee Assistance Program)