Bastien Lemale
Senior Software Engineer at Datadog
Nantes, Pays de la Loire, France
Summary
🤩
Rockstar🎓
Top SchoolBastien Lemalé is a Senior Software Engineer with 13 years' experience building high-throughput, production-grade backend systems, currently at Datadog in Nantes. Trained at Ecole Centrale de Nantes with additional study at the Technical University of Denmark, he blends strong computer-science fundamentals with practical expertise in Scala, Java, and distributed systems. He has driven performance and observability improvements both at Datadog (agent logging, TLS robustness, compression) and earlier at Teads where he helped a real-time bidding engine handle 100k req/s under tight latency constraints. An active open-source contributor, he has strengthened Gatling’s reporting and performance analysis tooling, applying the same profiling and optimization rigor to internal platforms. Colleagues value his focus on code quality, sustainable delivery, and measurable performance gains across complex, high-scale environments.
13 years of coding experience
8 years of employment as a software developer
Lycée Jean MonnetCPGE, MPSI - PSI*, CPGE, MPSI - PSI* at Lycée Descartes - ToursMaster's degree (M1), Computer Software Engineering, Master's degree (M1), Computer Software Engineering at Technical University of DenmarkEcole Centrale de Nantes engineer degree, Computer Software Engineering, Ecole Centrale de Nantes engineer degree, Computer Software Engineering at Ecole centrale de Nantes
French, English, German
Github Skills (31)
observability10
tls1210
charts10
loadtest10
http10
tls1310
performance-testing10
scala10
mtls10
go10
libtls10
logging10
gatling10
load-testing10
metric10
Programming languages (9)
Github contributions (5)
gatling/gatling
Aug 2012 - Mar 2014
Modern Load Testing as Code
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:41 commits, 5 comments in 1 year 6 months
Contributions summary:Bastien implemented new features and improved existing components within the Gatling charts module. These changes involved creating new graphs and optimizing existing charts for request and latency metrics, as well as fixing session computation issues. Additionally, the user addressed issues related to standard deviation calculations and overall reporting, demonstrating a focus on improving the performance analysis capabilities of the tool. The user primarily worked with Scala code, contributing to the enhancement of the load testing reports.
gatlingload-testingloadtestingtestingscala
DataDog/datadog-agent
Jul 2019 - Apr 2020
Main repository for Datadog Agent
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 reviews, 26 commits, 28 PRs in 9 months
Contributions summary:Bastien primarily focused on enhancing the Datadog Agent's logging capabilities. They addressed critical issues related to TLS handshake timeouts, file descriptor leaks during file rotations, and implemented compression for HTTP endpoints. Furthermore, the user refactored existing code, introduced new metrics related to compression, and improved the agent's status reporting to include transport details. These changes increased the reliability, efficiency, and observability of log handling within the Datadog Agent.
golangdatadog-agentagentobservabilitypmm
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