Sylvain Wallez
Senior Principal Engineer at Elastic
Toulouse, Occitania, France
Summary
🤩
Rockstar🎓
Top SchoolSylvain Wallez is a Senior Principal Engineer with 25 years building high-performance, distributed back-end systems and developer SDKs, currently shaping Elasticsearch’s analytical engine and ES|QL. He’s a hands-on architect and polyglot engineer who repeatedly ships production systems in Rust, Scala and Java, and designs purpose-built data platforms using Cassandra, MongoDB, Arrow and Parquet. At Elastic he led client SDK metamodels and code generators for hundreds of endpoints and contributed to flagship open-source projects including the official Elasticsearch clients. A frequent speaker and long-time Apache committer, he combines deep low-level systems knowledge with product sensibility and mentorship experience. Notably, he has a track record of rewriting critical components in Rust (Elastic Cloud proxy, MCP server), reflecting a pragmatic drive to modernize legacy stacks without losing operational rigor.
25 years of coding experience
33 years of employment as a software developer
Master's Degree, Computer Science, special mention in Artificial Intelligence, Master's Degree, Computer Science, special mention in Artificial Intelligence at Université de Technologie de Compiègne (UTC)
English, French
Stackoverflow
1reputation
0reached
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Github Skills (24)
json10
api-rest10
apidoc10
api-design10
restful-api10
amazon-elasticsearch10
testing10
java10
javas10
http-client10
elasticsearchquery10
go10
api10
aws-elasticsearch10
rest-api10
Programming languages (15)
Github contributions (5)
elastic/elasticsearch-java
May 2021 - Jan 2023
Official Elasticsearch Java Client
Role in this project:
Back-end Developer
Back-end DeveloperContributions:35 releases, 107 reviews, 421 commits in 1 year 8 months
Contributions summary:Sylvain's commits primarily focused on developing the official Elasticsearch Java Client. These contributions include implementing and refactoring various API client features, such as changes to the request/response handling, and the addition of features. The work involved code restructuring, improvements to the internal code structure, and bug fixes. The changes also involved adding new functionality to interact with the API and adjusting build configuration.
restelasticsearchjavasearchjava-client
elastic/elasticsearch
Aug 2020 - May 2022
Free and Open Source, Distributed, RESTful Search Engine
Role in this project:Back-end Developer
Back-end DeveloperContributions:56 reviews, 32 commits, 80 PRs in 1 year 9 months
Contributions summary:Sylvain primarily contributed to the Elasticsearch client library, enhancing its functionality and addressing existing issues. Their work included implementing features like handling custom ports and adding gzip compression support for improved performance. They also fixed bugs related to response headers and implemented a client metadata header for better request analysis. The user demonstrates expertise in client-side development and HTTP communication within the context of the Elasticsearch search engine.
restfulsearch-engineopensearchelasticsearchjava
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