Paul Asmuth
Software Developer at Freelance
Amsterdam, North Holland, Netherlands
Summary
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RockstarPaul Asmuth is a seasoned software developer based in Amsterdam with 25 years of hands-on experience building back-end systems and distributed data tooling. As a long-time open-source contributor he has worked on high-performance projects like a massively parallel SQL engine and a pure-JavaScript Parquet writer, focusing on core reliability, encoding/compression, and protocol-level performance improvements. As a freelancer he specializes in backend engineering, native integrations, and data processing optimizations—often improving robustness, error handling, and logging for easier production debugging. His work shows a pattern of quietly refactoring and hardening complex systems (e.g., TCP tuning, native Jaccard optimizations, and metadata handling) rather than flashy feature work. Practical, detail-oriented, and performance-minded, he brings deep systems knowledge to data-intensive applications.
25 years of coding experience
Github Skills (22)
algorithm10
javascript10
c-language10
software-design10
redis10
encoder10
c1110
data-structure10
c1710
encoding10
parquet10
data-structures10
encode10
error-handling10
cprogramming-language10
Programming languages (6)
Github contributions (5)
ironSource/parquetjs
Aug 2017 - Jun 2020
fully asynchronous, pure JavaScript implementation of the Parquet file format
Role in this project:
Back-end Developer
Back-end DeveloperContributions:137 commits, 6 PRs, 22 pushes in 2 years 10 months
Contributions summary:Paul primarily worked on developing the core functionality of a Parquet file writer in JavaScript, including the creation of file metadata, data pages, and column chunks. Their contributions focused on implementing various encoding and compression algorithms for the data, with a specific focus on RLE and PLAIN encoding. They also added support for nested records and designed the structure for storing key-value metadata within the Parquet file.
file-formatasynchronousparquetjavascriptpure-javascript
asmuth/recommendify
Mar 2012 - May 2014
Generate recommendations using collaborative filtering
Role in this project:Back-end Developer
Back-end DeveloperContributions:38 commits in 2 years 2 months
Contributions summary:Paul primarily focused on enhancing the project's native implementation. They made significant contributions by incorporating configurable Redis host/port settings, improving error handling, and optimizing performance within the native client. Furthermore, the user addressed various bugs, including an issue related to the default port not being set correctly, and refined the native Jaccard implementation. These changes culminated in a version bump to optimize the native operations and improve robustness.
collaborative-filteringrecommendation-enginerecommendationscollaborativefiltering
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