Etienne Callies
Research Engineer at Ouihelp
Greater Le Havre Area France
Summary
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Rockstar🎓
Top SchoolEtienne Callies is a research engineer with a decade of experience building data-driven systems and algorithms across industry and academia from Greater Le Havre, France. He has blended applied research and production software work—designing a linear logic tool with ENS Lyon, developing trip-search algorithms at BlaBlaCar, and delivering ETL and cloud migrations for nonprofit platforms. Currently at Ouihelp, he focuses on research-driven engineering initiatives that bridge theory and product. Trained at École Polytechnique and MINES ParisTech, he brings a strong math-and-CS foundation to practical problems in search, data mining, and operational research. A pattern in his career is moving between research prototypes and scalable production code, making him adept at turning formal ideas into reliable systems.
10 years of coding experience
5 years of employment as a software developer
Maison Saint Jean-BaptisteMaster, Mathématiques et informatique, Master, Mathématiques et informatique at Ecole polytechniqueIngénierie informatique, Ingénierie informatique at MINES ParisTech
Stackoverflow
21reputation
9kreached
1answer
1question
Github Skills (131)
env10
dashboard10
postgresql10
python10
operation10
airbyte10
data-warehouse10
solver10
databases10
data-ingestion10
etl10
duckdb10
data-pipeline10
sequent-calculus10
lakes10
Programming languages (12)
Github contributions (5)
ComputerAidedLL/click-and-collect
Mar 2021 - Sep 2021
A web interactive tool for building proofs in the sequent calculus of Linear Logic, with its backend written in OCaml
Contributions:53 reviews, 416 commits, 112 PRs in 6 months
homotopy-type-theorysequent-calculussat-solverlinear-logicagda
etiennecallies/confessio
Aug 2024 - Apr 2025
A search engine for confession hours by scraping parish websites.
Contributions:1 review, 12 PRs, 443 pushes in 7 months
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