Sébastien Han
Senior Principal Software Engineer - Office Of The CTO at Red Hat
Marseille, Provence-Alpes-Côte d'Azur, France
Summary
🤩
Rockstar🎓
Top SchoolSébastien Han is a Senior Principal Software Engineer with 14 years shaping cloud-native storage and AI-ready data platforms from Marseille, currently leading the Data Management team in Red Hat’s Office of the CTO. He combines deep Ceph and Kubernetes orchestration expertise—maintainer of Rook and longtime contributor to Ceph, ceph-ansible and related container projects—with hands-on DevOps work that spans automation, testing infrastructure, and RADOSGW/Go bindings. His work bridges storage and emerging AI patterns like distributed fine-tuning and RAG architectures, making him a go-to architect for OpenShift Data Foundation and scalable storage-for-AI designs. Notably, his contributions include containerizing Ceph early, automating complex installs across distros, and improving test reliability for Llama-related stacks, reflecting both operational rigor and research-forward thinking.
14 years of coding experience
12 years of employment as a software developer
Baccalauréat Général, Économique et Social, Baccalauréat Général, Économique et Social at Lycée L'Olivier Robert CoffyExpert en Informatique et Systèmes d’Information, Expert en Informatique et Systèmes d’Information at SUPINFO - The International Institute of Information TechnologyLicence Professionnelle Réseaux & Télécom Administration et Sécurité des Réseaux, Licence Professionnelle Réseaux & Télécom Administration et Sécurité des Réseaux at Université Aix Marseille 2 MediterranéeBTS, Informatique de gestion, BTS, Informatique de gestion at Lycée Charles Péguy
French, English, Japanese
Github Skills (37)
kubernetes10
docker10
develop10
pytest10
python10
apidoc10
back-end-development10
testing10
storage10
distributed-systems10
containerization10
dockers10
cicd10
binding10
automation10
Programming languages (19)
Github contributions (5)
ceph/ceph-ansible
Jun 2015 - Feb 2019
Ansible playbooks to deploy Ceph, the distributed filesystem.
Role in this project:
DevOps Engineer
DevOps EngineerContributions:108 releases, 1 review, 2308 commits in 3 years 8 months
Contributions summary:Sébastien primarily contributed to infrastructure automation and configuration management within the Ceph Ansible repository. They implemented changes to automate the installation process, fixed issues related to installing Ansible on various Linux distributions. They also modified the systemd service configurations for containerized deployments, including setting memory limits, and configuring network settings. The user's work also included refactoring the installation process for better reliability and maintainability.
pythonvagrantdevopsansibleceph
rook/rook
Dec 2017 - Jun 2022
Storage Orchestration for Kubernetes
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:2 releases, 3425 reviews, 2493 commits in 4 years 7 months
Contributions summary:Sébastien's contributions primarily focused on the Ceph storage orchestration system for Kubernetes. The user implemented features related to Ceph upgrades, including displaying success messages after completion and incorporating checks to avoid problems with running OSDs. The user also improved the test framework by collecting logs earlier and made modifications to prevent issues and streamline functionality when managing object storage components.
etcddata-protectionorchestrationdockerceph
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