Linas Medžiūnas
Sr Principal Architect Engineer at Palo Alto Networks
Vilnius, Vilnius County, Lithuania
Summary
🤩
Rockstar🎓
Top SchoolLinas Medžiūnas is a Sr Principal Architect Engineer with a decade of experience building high-scale backend systems, specializing in time-series databases, performance tuning, and SQL optimizations. He led core implementations at Chronosphere (now part of Palo Alto Networks) including low-overhead downsampling, query sharding, and efficient native histogram storage that are deployed in production at major customers. A strong competitive programmer, he brings rigorous algorithmic thinking to system architecture and has contributed performance and correctness fixes to prominent open-source projects like Prometheus, M3, and the Scala standard library. He excels at designing operational processes for live cluster resizing and other stateful migrations that minimize downtime—solutions that are often non-obvious but crucial in production. Comfortable both shipping low-level optimizations and mentoring teams in locations with scarce domain expertise, he combines hands-on coding with pragmatic technical leadership. Based in Vilnius, Lithuania, he pairs deep backend craftsmanship with a track record of widely adopted, industry-impacting work.
10 years of coding experience
15 years of employment as a software developer
Master Computer Science, Master Computer Science at Vilniaus universitetas / Vilnius University
Lithuanian, English, Russian
Github Skills (21)
algorithm10
timeseries-database10
monitoring10
algorithms10
testing10
time-series10
histogram10
data-structure10
tsd10
go10
prometheus10
performance-optimization10
scala-compiler10
data-structures10
functional-programming10
Programming languages (4)
Github contributions (5)
m3db/m3
May 2020 - Jan 2022
M3 monorepo - Distributed TSDB, Aggregator and Query Engine, Prometheus Sidecar, Graphite Compatible, Metrics Platform
Role in this project:
Back-end Developer
Back-end DeveloperContributions:752 reviews, 519 commits, 411 PRs in 1 year 8 months
Contributions summary:Linas's primary contribution is to implement core features and enhancements to the m3db codebase. They have focused on improving the comparator service, including generating random multi-series metrics and filtering query results by tag matchers. Additionally, the user has worked on improving other parts of the codebase, like modifying the existing code for the "query" and the "dbnode" and adding features to the remote read debug endpoint.
distributedquerymonorepoquery-enginesidecar
prometheus/prometheus
Jun 2020 - Jun 2020
The Prometheus monitoring system and time series database.
Role in this project:Back-end Developer
Back-end DeveloperContributions:20 reviews, 1 commit, 14 PRs in 1 day
Contributions summary:Linas primarily contributed to the Prometheus monitoring system by addressing and fixing bugs related to histogram calculations and data validation. They implemented and improved methods for comparing and validating histograms, ensuring data accuracy within the system. Their work involved modifications across several files to address inconsistencies and improve the overall reliability and performance of histogram-related functionalities. These changes focused on improving the accuracy and reliability of native histograms.
time-series-databaseprometheus-exporterseries-databasealertingdatabase
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