Asaf Mesika
Software System Architect at DriveNets
Center District, Israel
Summary
🤩
Rockstar🎓
Top SchoolAsaf Mesika is a Software System Architect with 25 years of hands-on experience designing horizontally scalable, SaaS-based systems and application infrastructure centered on Java and its open-source ecosystem. He has led architecture and engineering efforts across startups and scale-ups—shaping observability, metrics, and Big Data platforms at companies like StreamNative, Logz.io and DriveNets—and currently drives OSS-focused OSS architecture for telcos. A pragmatic technical leader, he has repeatedly raised engineering quality through processes, testing, and documentation, and delivered measurable improvements like dramatic GC/memory wins in the OpenTelemetry Java SDK and parallelized CI to cut build times in half. As an Apache Pulsar committer and active OpenTelemetry member, he combines product-facing initiatives (revamping docs and on-call guides) with deep protocol and SDK work that enabled Pulsar’s OTel integration. He’s also a community builder—founder of Israel’s first Java User Group and co-founder of Java.IL and Tech Leads IL—bringing rare experience in both grassroots community organization and high-stakes system design. Not obvious from his title: he often drives specification-level changes (MetricFilter, memory-mode in OTel) that reshape how observability works at scale.
11 years of coding experience
22 years of employment as a software developer
MBA, Business School, MBA, Business School at Technion - Israel Institute of Technology
Hebrew, English
Stackoverflow
1,663reputation
316kreached
23answers
21questions
Github Skills (20)
docker10
testing10
dockers10
java10
javas10
junit10
sdk10
opentelemetry10
metric10
integration-testing10
test-automation10
docker-compose9
performance-testing9
aggregations9
xml6
Programming languages (15)
Github contributions (5)
open-telemetry/opentelemetry-java
Jul 2019 - Sep 2024
OpenTelemetry Java SDK
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:85 reviews, 14 PRs, 146 comments in 5 years 3 months
Contributions summary:Asaf primarily focused on enhancing the OpenTelemetry Java SDK by adding and supporting memory mode features within synchronous and asynchronous instruments. Their contributions included implementing memory mode for various instrument types, such as counters and exponential histograms, and writing comprehensive tests to ensure functionality and correctness across different aggregation temporality modes and memory modes. They also worked on optimizing the SDK through benchmark tests to evaluate garbage collection performance.
tracingobservabilitysdkotelopentelemetry-java
testcontainers/testcontainers-java
Mar 2016 - Apr 2016
Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:6 commits, 2 PRs, 63 comments in 8 days
Contributions summary:Asaf contributed to the `testcontainers-java` repository by addressing issues related to Docker image validation and handling private repositories with ports. They added exception handling and improved the logging within the project. The user also focused on refactoring and extending the test suite, including adding tests for Docker image names and logging behavior. These changes indicate a focus on improving the robustness and maintainability of the core functionality of the library.
junit-testsjunitinstancestest-automationbrowsers
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