Benjamin Chastanier
Senior Backend Engineer at Qovery
Paris, Ile-de-France
Summary
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Rockstar🎓
Top SchoolBenjamin Chastanier is a Senior Backend Engineer based in Paris with 11 years of experience building production-grade web and backend systems, currently contributing to R&D at Qovery. He brings a rare combination of engineering and management training from top French schools and has progressed from hands-on full-stack startups to senior roles at adtech leader Criteo. His open-source work includes meaningful contributions to prebid-server—adding robust multi-currency support and validation to a widely used real-time advertising auction project. Comfortable across cloud platforms, distributed systems, and integration-heavy RTB ecosystems, he excels at turning complex protocol and data constraints into reliable services. Colleagues know him for pragmatic problem-solving and a product-minded approach born from earlier co-founding and consulting experiences.
11 years of coding experience
10 years of employment as a software developer
MS, Advanced Master's Degree, Information Technology Management, MS, Advanced Master's Degree, Information Technology Management at Ecole centrale de LyonMS, Advanced Master's Degree, Information Technology Management, MS, Advanced Master's Degree, Information Technology Management at Ecole de Management de LyonDUT, Informatique, DUT, Informatique at Université Claude Bernard (Lyon I)Engineer's degree, Information Technology Project Management, Engineer's degree, Information Technology Project Management at Ecole supérieure de Chimie Physique Electronique de Lyon
French, English, Spanish
Stackoverflow
169reputation
2kreached
2answers
5questions
Github Skills (17)
apidoc10
convert10
go10
api10
currency-exchange10
currency-converter10
convertion10
openrtb9
testing8
json7
rust6
wasm-bindgen6
angularjs6
docker6
amazon-web-services6
Programming languages (11)
Github contributions (5)
prebid/prebid-server
May 2018 - Apr 2021
Open-source solution for running real-time advertising auctions in the cloud.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:44 reviews, 26 commits, 36 PRs in 2 years 11 months
Contributions summary:Benjamin primarily focused on adding currency support features to the prebid-server project. This involved introducing new data structures to manage currency information in adapter bid responses and modifying existing adapters to utilize these new structures. Furthermore, the user implemented mechanisms to validate currency conversions, ensuring that bids with mismatched or invalid currencies are rejected. The changes also included setting up a debug endpoint to expose currency rate converter internals.
nodejsserver-sideprebid
criteo-forks/prebid-server
May 2018 - Apr 2021
Server side component to offload prebid processing to the cloud
Contributions:14 releases, 19 PRs, 105 pushes in 2 years 11 months
nodejsserver-sideprebid
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