Mike
Software Engineer at Performant Data LLC
Berkeley, California, United States
Summary
🤩
RockstarMike is a software engineer based in Berkeley with 11 years of experience specializing in Scala, databases, and performance optimization. He contributes to core open-source projects like the Scala compiler and Sangria GraphQL, improving compiler data structures and parser/AST robustness. His work includes practical performance engineering—optimizing OpenHashMap with quadratic probing, fixing memory leaks, and adding JMH benchmarks—to make foundational libraries faster and more reliable. Mike pays careful attention to long-term code quality and binary compatibility, routinely adding type annotations, override modifiers, and refactoring types into clearer layouts. He combines deep back-end systems expertise with a pragmatic focus on measurable improvements, often surfacing subtle issues that matter at scale. Based in the Bay Area, he brings both tooling-level impact and hands-on engineering to database and language runtime problems.
11 years of coding experience
Github Skills (20)
parserator10
performance-analytics10
parser10
performance-monitor10
abstract-syntax-tree10
wpgraphql10
performance-measurement10
scala10
performance-analysis10
wordpress-graphql10
scala-compiler10
performance-tuning10
hashtable10
graphql10
hash10
Programming languages (13)
Github contributions (5)
sangria-graphql/sangria
Sep 2021 - Nov 2021
Scala GraphQL implementation
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 reviews, 51 commits, 27 PRs in 2 months
Contributions summary:Mike primarily contributed to the Sangria GraphQL implementation, focusing on improvements to the core functionality related to the Abstract Syntax Tree (AST) and parser packages. Their work included adding type annotations to improve code quality, introducing `override` modifiers, and refactoring code by moving types to separate files. Additionally, they addressed binary compatibility issues, fixed type errors, and performed code cleanup, including scaladoc and style improvements.
apisangriaplay-frameworkgraphql-scalascala
scala/scala
Oct 2015 - May 2016
Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3
Role in this project:Back-end Developer / Performance Engineer
Back-end Developer / Performance EngineerContributions:17 commits, 12 PRs, 115 comments in 7 months
Contributions summary:Mike contributed to the Scala compiler and standard library, focusing on performance improvements and bug fixes. Their work included optimizing the `OpenHashMap` data structure, addressing memory leaks, and enhancing its performance through quadratic probing. The user also implemented benchmarking tools, adding JMH integration and creating benchmarks for measuring the performance of the `OpenHashMap` implementation. The user's efforts aimed to improve the efficiency and reliability of the core Scala library components.
functional-programmingobject-oriented-programmingscala-libraryscala-programming-languagestandard-library
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