Ganesh Vernekar
Staff Software Engineer at Reddit, Inc.
Greater Seattle Area United States
Summary
🤩
Rockstar🎓
Top SchoolGanesh Vernekar is a Staff Software Engineer with a decade of experience building and scaling observability systems, currently shaping Reddit’s telemetry platform for billions of active time series and petabytes of data. He is a longtime Prometheus maintainer and contributed critical backend work across Prometheus, Cortex, Grafana Mimir and Grafana’s unified alerting, delivering features like native high-resolution histograms, m-mapped in-memory data, and Kafka-backed block builders. Ganesh’s work focuses on low-level Go optimizations, race-condition fixes, and TSDB improvements that have produced substantial performance and memory wins (e.g., 10x query speedups and ~40% memory reductions). He joined Grafana when it was under 50 people and grew with the company, leading cross-project efforts to modernize alerting and long-term storage. Beyond production engineering, he has been active in the Prometheus community as a GSoC mentor and contributor, demonstrating a commitment to open-source mentorship and tooling. An interesting detail: he combines deep systems-level changes with practical DevOps improvements—shipping new notification channels and DB-driven config reloads alongside TSDB and query engine refactors.
10 years of coding experience
7 years of employment as a software developer
Bachelor of Technology - BTech Computer Science and Engineering, Bachelor of Technology - BTech Computer Science and Engineering at Indian Institute of Technology HyderabadMaster of Science - MS Computer Science, Master of Science - MS Computer Science at Purdue University
English, Hindi, Kannada, Konkani
Stackoverflow
1reputation
0reached
0answers
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Github Skills (38)
dependency-management10
back-end-development10
email-notifications10
alertdialog10
memory-management10
alertview10
alerts10
tsd10
go10
prometheus10
alarmmanager10
wal10
backend10
concurrency10
notificationmanager10
Programming languages (9)
Github contributions (5)
prometheus/prometheus
Jan 2018 - Jan 2023
The Prometheus monitoring system and time series database.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 releases, 1239 reviews, 350 commits in 5 years
Contributions summary:Ganesh primarily focused on addressing concurrency issues and optimizing the Prometheus monitoring system's core functionalities. Their work involved fixing race conditions within the discovery mechanism and refactoring code to improve performance, as evidenced by changes in memory management and iterations. Additionally, the user contributed to the enhancement of the system's internal data structures, such as the implementation of a symbol table, which is crucial for the efficient storage and retrieval of metrics data. The user contributed code to improve the reliability of the Prometheus TSDB.
time-series-databaseprometheus-exporterseries-databasealertingdatabase
cortexproject/cortex
Jan 2019 - Feb 2021
A horizontally scalable, highly available, multi-tenant, long term Prometheus.
Role in this project:Back-end Developer
Back-end DeveloperContributions:87 reviews, 170 commits, 90 PRs in 2 years 1 month
Contributions summary:Ganesh focused on improving the Cortex project's querier functionality by modifying its interaction with the ingesters. The changes include modifying the codebase for historical queries to avoid ingesters, which improved the query performance. The commits show the user interacting with the code related to query execution. The user introduced changes related to query lookback and the processing of queries that involve the ingester.
golangscalabletenantprometheus-exporterlong-term
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