Jonathan Halterman
Principal Software Engineer at Grafana Labs
California, United States
Summary
🤩
Rockstar🎓
Top SchoolJonathan Halterman is a Principal Software Engineer with 15 years of experience designing and operating large-scale public cloud services, currently building Grafana Cloud and Enterprise Metrics. He has a strong backend and distributed-systems pedigree from roles at Elastic and HPE, where he architected scalable microservices, fault-tolerant platforms, and real-time streaming systems serving thousands of customers across multi-cloud regions. An active open-source contributor, Jonathan has improved resilience and concurrency in projects such as the failsafe JVM library, the Raft-based Atomix Copycat, and Grafana Mimir, and has hands-on DevOps experience wiring complex, observable microservice stacks. He’s known for pragmatic refactors that simplify APIs and fix subtle concurrency bugs (double-checked locking, non-volatile caches), reflecting a focus on reliability and maintainability. Based in California, he pairs deep systems engineering with rigorous testing and documentation practices, often surfacing non-obvious race conditions and API simplifications that reduce operational risk.
15 years of coding experience
22 years of employment as a software developer
California State University, Sacramento
Stackoverflow
5,077reputation
759kreached
54answers
8questions
java
top-5%
dto
top-5%
Github Skills (54)
concurrency10
unit-testing10
kubernetes10
docker10
observability10
multithreading10
api-design10
testng10
testing10
grafana10
dockers10
java10
javas10
data-mapping10
prometheus10
Programming languages (20)
Github contributions (5)
failsafe-lib/failsafe
Jun 2015 - Jan 2023
Fault tolerance and resilience patterns for the JVM
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 reviews, 688 commits, 76 PRs in 7 years 7 months
Contributions summary:Jonathan primarily focused on code refactoring and simplification efforts within the failsafe library. They removed redundant schedulers and simplified the API around recurrent tasks. Furthermore, they consolidated various APIs, implemented code consolidation for the AsyncCallable types, and worked on internal utilities related to the project's core functionality. These changes involved modifications across various classes.
tolerancefaultrate-limiterbulkheadjvm
jhalterman/expiringmap
Oct 2010 - Oct 2021
A high performance thread-safe map that expires entries
Role in this project:Back-end Developer
Back-end DeveloperContributions:155 commits, 16 PRs, 141 pushes in 11 years 1 month
Contributions summary:Jonathan primarily focused on updating documentation and tests for the expiringmap library. They made several documentation updates, including those for the source code files. Additionally, the user made changes to the test files, migrated the test dependency to TestNG, and fixed a null pointer exception that arose when putting a value over a previously put null value. The user also added support for ConcurrentMap.
expiresperformancethreadmapjava8
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