Joshua Holmer
Senior Software Engineer at ActiveCampaign
Indianapolis, Indiana, United States
Summary
🤩
Rockstar🎓
Top SchoolJoshua Holmer is a Senior Software Engineer in Indianapolis with 11 years of experience building scalable back-end systems and real-time integrations for SaaS at ActiveCampaign. A polyglot developer and Rust evangelist, he contributes to prominent open-source projects like rust-clippy, sqlx, oxipng, and the rav1e AV1 encoder, often focusing on performance, refactors, and toolchain improvements. He has designed and shipped production Python services for 100k+ customers, led architecture decisions around TypeScript adoption, and driven cross-team delivery in remote environments. His multimedia and encoding work on av1an and rav1e shows a niche expertise in video processing and removing C dependencies via idiomatic Rust. Known for pragmatic engineering—bug fixes, benchmarks, and lint rules—he balances long-term maintainability with measurable performance gains. Outside work he describes himself playfully as a crab enthusiast, reflecting a curious, community-minded open-source presence.
11 years of coding experience
7 years of employment as a software developer
Bachelor of Arts (B.A.), Psychology, Bachelor of Arts (B.A.), Psychology at Ball State University
Japanese
Github Skills (32)
algorithm10
algorithms10
video-encoding10
encoder10
testing10
clippy10
ffmpeg10
data-structure10
code-analysis10
av1-codec10
sql10
performance-optimization10
data-structures10
linting10
encode10
Programming languages (19)
Github contributions (5)
shssoichiro/oxipng
Jan 2016 - Dec 2022
Multithreaded PNG optimizer written in Rust
Role in this project:
Back-end Developer
Back-end DeveloperContributions:61 releases, 68 reviews, 163 commits in 7 years
Contributions summary:Joshua primarily contributed to fixing bugs and improving the functionality of the PNG optimization tool. They addressed an issue where the image header (IHDR) was outputted twice, and added an alias for the `--strip safe` command-line argument. Additionally, the user added a benchmark suite using Cargo, enhancing the project's testing capabilities and improved the handling of the output files.
image-optimizationrustpngquantcompressionoptimizer
xiph/rav1e
Oct 2018 - Jan 2023
The fastest and safest AV1 encoder.
Role in this project:Back-end Developer
Back-end DeveloperContributions:241 reviews, 307 commits, 649 PRs in 4 years 3 months
Contributions summary:Joshua's primary contribution focused on refactoring and rewriting transform functions, specifically targeting the removal of a C dependency in `transform.rs`. This involved rewriting forward and inverse transform functions, as well as refactoring the code into smaller, more manageable modules within the `rav1e` project. This effort likely aimed to improve the code maintainability and performance of the AV1 encoder.
av1-encoderencoderfastestav1
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