GlobalCpp

Daniel Lemire

Daniel Lemire is a full professor of computer science at the Université du Québec (TELUQ) in Montreal. He specializes in software performance, SIMD vectorization, data indexing, parsing, and high-speed data engineering.

He ranks among the top 2% of scientists worldwide by citations (Stanford/Elsevier 2025 ranking) and is one of GitHub’s top 1,000 most-followed developers. His C/C++ open-source contributions have been widely adopted by major systems, including:

• simdjson — the pioneering JSON parser reaching gigabytes per second;
• simdutf — ultra-fast Unicode and base64 processing;
• fast_float — high-speed number parsing (adopted in Rust, Go, .NET, C++ stdlib, and more);
• Roaring Bitmaps — used in Elasticsearch, Apache Spark, Druid, Netflix, Uber, and many others;
• Ada — one of the world’s fastest URL parsers (integrated in Node.js, Cloudflare, and beyond).

He has published over 100 peer-reviewed papers and serves as an editor of Software: Practice and Experience (Wiley, founded in 1971).