Jack Green
Software Engineer II at Hazelcast
Mid Suffolk, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolJack Green is a Software Engineer II with nine years of hands-on experience building Java-based data and analytics applications, and a decade-long background leading technical teams for law enforcement solutions. He has deep expertise in Spring, Hibernate, Maven, JUnit, PostgreSQL/H2, Jenkins and Git, and has progressed from engineer to senior technical lead roles at Chorus Intelligence before joining Hazelcast. At Hazelcast he contributed to the well-known open-source real-time data platform, improving migration time accuracy and boosting cache statistics performance via targeted refactors. Jack combines practical performance optimization skills with a strong academic foundation—a First Class Computer Science degree from the University of East Anglia—and a track record of delivering auditable, production-ready systems in sensitive domains. He’s based in Mid Suffolk and brings a pragmatic leadership style that emphasizes measurable improvements and maintainable code.
9 years of coding experience
10 years of employment as a software developer
Bachelor’s Degree, Computer Science, First Class, Bachelor’s Degree, Computer Science, First Class at University of East Anglia
Stackoverflow
1,030reputation
84kreached
41answers
78questions
Github Skills (20)
multithreading10
java10
javas10
performance-optimization10
concurrency10
caching9
distributed-systems9
datastructures-algorithms8
stream-processing8
data-structures8
data-structure8
algorithms8
algorithm8
string-formatting6
boolean-expression6
Programming languages (16)
Github contributions (5)
hazelcast/hazelcast
Jul 2023 - Apr 2025
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:295 reviews, 361 PRs, 185 pushes in 1 year 8 months
Contributions summary:Jack primarily worked on improving the Hazelcast real-time data platform. They focused on enhancing the performance and accuracy of the migration process within the system, specifically addressing time-related issues in the `MigrationListener`. Their contributions involved refactoring and optimizing the code to ensure accurate time measurements for migration operations. They also enhanced the efficiency of cache statistics counters by refactoring `AtomicLongFieldUpdater` to `LongAccumulator`, resulting in noticeable performance gains.
computationstream-processingbigtablereal-timestreaming-data
JackPGreen/backstage
Jun 2024 - Jul 2024
Backstage is an open framework for building developer portals
Contributions:130 pushes, 1 branch in 28 days
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