I am a computer science professor at the Université du Québec. 🇨🇦

• 📰 I write about software performance weeklyon my blog.
• 🏫 Among world's top 2% scientists (Stanford University/Elsevier ranking, 2024).
• 📺 I gave abest voted talk at QCon San Francisco on JSON parsing.
• 📄I wrote over 90 research papers including over 60 journal articles.
• 📖 I am editor of theSoftware: Practice and Experience journal (Wiley); it was founded in 1971.
• 📎On‐demand JSON: A better way to parse documents? was the most read article of the last 5 years at SPE (2024).
• 📎Parsing millions of URLs per second was the most read article of the last 5 years at SPE (2025).
• 📘 My latest book:Mastering Programming: From Testing to Performance in Go

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1. simdjson/simdjsonsimdjson/simdjsonPublic

   Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

   C++ 22.5k 1.2k

2. RoaringBitmap/RoaringBitmapRoaringBitmap/RoaringBitmapPublic

   A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

   Java 3.7k 576

3. RoaringBitmap/roaringRoaringBitmap/roaringPublic

   Roaring bitmaps in Go (golang), used by InfluxDB, Bleve, DataDog

   Go 2.8k 241

4. fastfloat/fast_floatfastfloat/fast_floatPublic

   Fast and exact implementation of the C++ from_chars functions for number types: 4x to 10x faster than strtod, part of GCC 12, MySQL, Chromium, Redis and WebKit/Safari

   C++ 1.9k 167

5. simdutf/simdutfsimdutf/simdutfPublic

   Unicode routines (UTF8, UTF16, UTF32) and Base64: billions of characters per second using SSE2, AVX2, NEON, AVX-512, RISC-V Vector Extension, LoongArch64, POWER. Part of Node.js, WebKit/Safari, Lad…

   C++ 1.5k 98

6. ada-url/adaada-url/adaPublic

   WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.

   C++ 1.6k 113