Julien Leblay
Senior Software Architect, Manager at Rakuten Tech in Europe
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolJulien Leblay is a Senior Software Architect and manager based in Chiyoda, Japan, with over a decade of experience building search systems, data pipelines and research-driven database technologies. He combines deep academic expertise—a PhD focused on large RDF datasets and postdoctoral work on query optimization—with hands-on engineering in Java, Python, SQL/NoSQL and cloud environments. At Rakuten he progressed from core search engineer to technical lead and now senior architect, driving booking search, LTR data pipelines, request-log analytics and automation for production-scale systems. His research background at AIST and Oxford on temporal knowledge graphs and querying heterogeneous, constrained data surfaces in practical solutions for complex business rules and low-latency requirements. Colleagues describe him as a pragmatic researcher-engineer who translates formal models into maintainable, performant systems. He brings a rare blend of academic rigor and production delivery, including long-term contributions to search relevance and data engineering at large consumer-facing platforms.
10 years of coding experience
18 years of employment as a software developer
DUT, Computer Science, DUT, Computer Science at University of South BrittanyMaîtrise, Mathematics & Computer Science, Maîtrise, Mathematics & Computer Science at Avignon UniversitéPhD, Computer Science, PhD, Computer Science at Université Paris-SaclayMSc, Artificial Intelligence & Decision, MSc, Artificial Intelligence & Decision at Sorbonne University
French, English, japanese (jlpt-n2), German
Github Skills (16)
querying9
query-language8
database6
mysql5
sql5
java4
levenshtein4
parsing4
argument-parsing4
command-line-parser3
command-line3
cli3
jaro-winkler3
similarity3
soundex2
Programming languages (2)
Github contributions (5)
jleblay/aihubtest
Jun 2019 - Jun 2019
Contributions:1 release, 1 push, 1 branch in 1 day
ProofDrivenQuerying/pdq
Oct 2015 - Feb 2016
PDQ (Proof-Driven Querying) is a platform for generating query plans over semantically-interconnected data sources with diverse access interfaces.
Contributions:25 commits in 4 months
queryplansdiversemysqlquerying
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