Lucas Capistrant
Staff Software Engineer at The Apache Software Foundation
Minneapolis, Minnesota, United States
Summary
🤩
Rockstar🎓
Top SchoolLucas Capistrant is a Staff Software Engineer with 11 years of experience building and operating large-scale, multi-tenant distributed systems, currently focused on high-performance analytics at Imply and as a long-standing Apache Druid committer. He has led design and operations of production Druid fleets at Target that scaled to hundreds of nodes, petabytes of storage, and hundreds of thousands of daily users while maintaining sub-second p95 latencies and high availability. Deeply practical across the stack, he pairs Java backend development, cluster tuning, and CI/CD automation with hands-on infrastructure work (kernel patches, RPMs, HDFS/JVM tuning) to deliver zero-downtime upgrades and stable services. His open-source work on Apache Druid—improving ingestion, security, request logging, and concurrency—reflects an emphasis on reliability and observability in real-time analytics. Based in Minneapolis, he brings a blend of technical leadership and meticulous problem-solving that surfaces in both operational playbooks and code-level fixes.
11 years of coding experience
11 years of employment as a software developer
Bachelor’s Degree Computer Science, Bachelor’s Degree Computer Science at University of Wisconsin-Madison
English
Github Skills (11)
javas10
http10
databases10
apache-druid10
relational-databases10
sql-database10
java10
database10
user-authentication9
authentication9
json8
Programming languages (3)
Github contributions (5)
apache/druid
Apr 2019 - Sep 2022
Apache Druid: a high performance real-time analytics database.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:147 reviews, 35 commits, 62 PRs in 3 years 5 months
Contributions summary:Lucas primarily focused on enhancing the HTTP Firehose functionality within the Apache Druid database. Their contributions included adding basic authentication support, improving security by preventing the logging of authentication credentials, and fixing code formatting issues. Furthermore, the user made improvements to the instantiation of ObjectMappers and added comments to improve clarity within the SQLMetadataStorageActionHandler. They also implemented the ability to toggle request logging on/off for different query types and made concurrency fixes to ComplexMetrics.java.
real-timebig-datadruiddatabasehadoop
capistrant/incubator-druid
Dec 2018 - Mar 2025
Apache Druid (Incubating) - Column oriented distributed data store ideal for powering interactive applications
Contributions:6 reviews, 3 PRs, 352 pushes in 6 years 4 months
incubatingidealdata-storeapachebig-data
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