Justin Lei
Senior Software Engineer at Grafana Labs
Yacolt, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolJustin Lei is a Senior Software Engineer with 13 years of experience building high-performance, distributed systems and time-series infrastructure. Based in Yacolt, Washington, he currently contributes at Grafana Labs after senior roles at New Relic and comScore, focusing on backend engineering for monitoring and observability. His open-source work includes improvements to Prometheus TSDB, Grafana Mimir, and a Go implementation of the Graphite API (carbonapi), where he optimized time-series processing, caching, and native-histogram tooling. Known for solving puzzles, he combines careful test-driven refactors with pragmatic performance tuning to stabilize streaming reads and chunk handling at scale. Collected from a USC computer science background, his contributions reveal a knack for both low-level data handling and practical integrations that improve system reliability.
13 years of coding experience
11 years of employment as a software developer
Bachelor of Science - BS, Computer Science, Bachelor of Science - BS, Computer Science at University of Southern California
Stackoverflow
305reputation
15kreached
1answer
15questions
Github Skills (20)
monitoring10
testing10
graphite10
capi10
histogram10
tsd10
go10
prometheus10
observability9
carbon-copy9
metric9
carbon-lang9
otel7
opentelemetry7
dom-events6
Programming languages (4)
Github contributions (5)
grafana/mimir
Sep 2022 - Jan 2023
Grafana Mimir provides horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 85 reviews, 14 commits in 4 months
Contributions summary:Justin primarily contributed to the `mimir` repository by fixing a 400 response related to streaming remote reads. This involved modifying integration tests to address the issue, incorporating a logging writer from a related library, and updating the CHANGELOG.md file. Furthermore, the user updated tooling for native histograms by adding the functionality to the tools. These contributions indicate a focus on improving the functionality and stability of the system.
tenantobservabilitygrafanaprometheusstorage
prometheus/prometheus
Sep 2022 - Jul 2024
The Prometheus monitoring system and time series database.
Role in this project:Back-end Developer
Back-end DeveloperContributions:31 reviews, 11 PRs, 67 comments in 1 year 10 months
Contributions summary:Justin primarily focused on enhancing the Prometheus monitoring system's time series database (TSDB) capabilities. Their work involved refactoring and improving the `tsdbutil` package for tests related to native histograms, adding functionalities like generating test samples and adapting the code for remote read operations. They also made adjustments to chunk handling, specifically concerning chunk size limits, to optimize data storage and processing efficiency within the Prometheus system.
time-series-databaseprometheus-exporterseries-databasealertingdatabase
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