Sébastien Deleuze

Software Engineer

Lyon, France14 yrs 4 mos experience

Highly StableAI Enabled

Key Highlights

Led the introduction of GraalVM support in Spring.
Created and led multiple successful Open Source projects.
Recognized as a Google Developer Expert in Kotlin and Dart.

Stackforce AI infers this person is a SaaS expert with a strong focus on Spring Framework and modern web technologies.

Contact

Skills

Core Skills

SpringJavaKotlinSoftware ArchitectureGeographic Information Systems (gis)

Other Skills

Open Source SoftwareGraalVMArtificial Intelligence (AI)WebAssemblySpring FrameworkSpring BootReactive ProgrammingDartJavaScriptActionScriptFlexBackbone.jsMavenRESTSOA

About

I work at Broadcom as a Spring Framework core committer where I am leading various cross-cutting efforts such as the Null Safety of Spring APIs, the Kotlin support and the runtime efficiency of Spring applications via GraalVM native image and AOT cache (Project Leyden) support for cheaper and more sustainable hosting. I am also involved in the Spring web support where I contributed key building blocks such as the CORS support or some parts of Spring WebFlux Reactive infrastructure. I have also recently joined the Spring AI team. I have created and led several Open Source projects such as Spring Native (which successfully incubated to the current Spring Boot native image support), Spring Fu (discoverable, efficient and explicit configuration model for Spring), RestHub (full-stack development with Java and JavaScript). I also co-created OpenScales (a former popular GIS 2D visualization technology). I am a former Dart Google Developer Expert, Kotlin Google Developer Expert and member of the W3C WebAssembly Community Group I am a former staff member of the MiXiT conference, and a frequent speaker who has been giving talks in various conferences such as Spring One (keynote), Spring IO (keynote), Devoxx Belgium, Devoxx France, MiXiT, KotlinConf (closing keynote panel), Oracle Developer Live, Øredev, etc.

Experience

14 yrs 4 mos

Total Experience

7 yrs 2 mos

Average Tenure

Current Experience

Broadcom

Master Software Engineer

Nov 2024 – Present · 1 yr 5 mos · Lyon, Auvergne-Rhône-Alpes, France · Remote

Post acquisition, I continue my work on Spring Framework and across the Spring portfolio with a focus on runtime efficiency (with technologies like GraalVM, Project CRaC, CDS or Project Leyden), performance, null-safety and Kotlin support.
I have also joined the Spring AI team and am involved on making Tanzu Platform the best place to run Spring applications.

SpringOpen Source SoftwareGraalVMJavaArtificial Intelligence (AI)

Vmware

Staff Software Engineer 2

Jun 2020 – Nov 2024 · 4 yrs 5 mos

Following the acquisition of Pivotal by VMware, as a full time Spring Framework contributor, I have led the introduction GraalVM native images support in Spring by co-creating and leading the Spring Native experimental project.
I am also working on WebAssembly and contributing to this technology as part of the W3C WebAssembly Community Group.
I am or has been participating to various cross-industry efforts:
GraalVM advisory board with Oracle
Kotlin server-side working group with JetBrains and Google
JSpecify to standardize null-safety annotations on the JVM with JetBrains and Google

SpringJavaKotlinGraalVMWebAssemblySpring Framework

Google

2 roles

Kotlin Google Developer Expert

Promoted

May 2020 – Mar 2025 · 4 yrs 10 mos

As a recognition of my work around introducing Kotlin support in Spring Framework, and promoting Kotlin usage on server side, I am now a Kotlin Google Developer Expert.
As a big believer in WebAssembly, I have have pushed for the creation of Kotlin/Wasm and I am following closely its evolution.

KotlinWebAssembly

Dart Google Developer Expert

Feb 2014 – Feb 2015 · 1 yr

I have been a Dart Google Developer Expert for 1 year, giving conferences in Europe about this technology.

Dart

Pivotal software, inc.

Principal Software Engineer

Feb 2014 – May 2020 · 6 yrs 3 mos

As a full time Spring Framework contributor, I have introduced Kotlin, CORS and null-safety support in Spring Framework. I have been in charge of Spring MVC maintenance and have been involved in the design and implementation of Spring WebFlux and Reactor.
I have pushed for making functional programming and configuration DSLs first class constructs in the Spring ecosystem via the Spring Fu project I created.

KotlinSpring BootReactive ProgrammingSpringJavaSpring Framework

Worldline

Software Architect

Jul 2005 – Jan 2014 · 8 yrs 6 mos

At Worldline, I designed large service oriented software architecture and Web applications based on Java, Spring, Javascript and HTML. Among other things, I have been responsible for maintaining Le Louvre museum website (https://www.louvre.fr/en) and technical architect of the french Geoportal (https://www.geoportail.gouv.fr/).
I created Kazan, the Atos Worldline forge including an HTML5 portal, and support for Git, Mercurial, Jenkins, Sonar, Nexus and cloud based functionnalities, and Web IDE capabilities.
I also led Atos Worldline Innovation Labs (our own Google Day), and promoted innovation and technical expertise in Worldline. I created 2 open source projects there : OpenScales (mapping framework based on ActionScript 3 and Flex) and RESThub (fullstack framework based on Spring and Backbone.js).

Geographic Information Systems (GIS)Software ArchitectureJavaScriptJava