Jean Prieur
Principal Software Engineer at Microsoft
Redmond, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolJean Prieur is a Principal Architect and longtime Microsoft identity specialist with over 25 years in software engineering and 11 years focused on identity and developer experiences at Microsoft. He drives architectural strategy for authentication SDKs, securing non-human identities and enabling autonomous AI agents while evolving the Microsoft Identity Service Essentials framework. A hands-on contributor to high-profile open-source projects such as MSAL.NET and microsoft-identity-web, he has improved API quality, added Web API templates, and modernized migration paths between ADAL and MSAL. He combines deep .NET and Visual Studio expertise with program management experience across developer tooling, technical debt scenarios, and cross-org standards. Trained as an engineer at CentraleSupélec and Caltech, he pairs rigorous academic foundations with practical field experience from defense simulations to enterprise identity. Notably, he mentors future architects and regularly presents at major Microsoft events, translating complex security requirements into usable developer workflows.
11 years of coding experience
27 years of employment as a software developer
Diplome d'ingénieur Supélec Electrical Engineering and computer science, Diplome d'ingénieur Supélec Electrical Engineering and computer science at CentraleSupélecCalifornia Institute of Technology
Stackoverflow
71reputation
3kreached
4answers
0questions
Github Skills (35)
azuread10
authorizations10
mstest10
identity10
openid-connect10
testing10
net10
openidc10
oid10
authentication10
user-authentication10
dotnet10
templater10
template-engine10
asp-net-core10
Programming languages (12)
Github contributions (5)
Azure-Samples/active-directory-dotnetcore-daemon-v2
Oct 2018 - Dec 2022
A .NET Core daemon console application calling Microsoft Graph or your own WebAPI with its own identity
Role in this project:
Back-end Developer
Back-end DeveloperContributions:61 reviews, 97 commits, 115 PRs in 4 years 2 months
Contributions summary:Jean's initial commit set up the basic structure for a .NET Core daemon application. Subsequent commits involved updating dependencies to MSAL.NET, then migrating the project to .NET Core 2.2 and MSAL 3.0.0-preview. Later commits focused on updating to newer MSAL.NET versions and .NET Core 3.0. The user demonstrated the ability to work with authentication libraries and configure a daemon application.
console-applicationdotnetmicrosoft-graphaadv2console
Azure-Samples/active-directory-aspnetcore-webapp-openidconnect-v2
Apr 2018 - Dec 2022
An ASP.NET Core Web App which lets sign-in users (including in your org, many orgs, orgs + personal accounts, sovereign clouds) and call Web APIs (including Microsoft Graph)
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 release, 125 reviews, 296 commits in 4 years 8 months
Contributions summary:Jean primarily contributed to this ASP.NET Core web application by implementing or updating code related to authentication and authorization, particularly focusing on Azure Active Directory (Azure AD) integration. Their work included changes to the application's configuration, such as targeting the Azure AD V2.0 authority and modifications to the login and sign-out functionality. The user also modified the code to handle incremental consent and address issues with token caching.
microsoft-graphscenario-webapp-signin
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