Jose Leon
Cloud Technical Leader at CERN
Geneva, Geneva, Switzerland
Summary
👤
Senior🎓
Top SchoolJose Leon is a Cloud Technical Leader with 14 years’ experience designing and operating large-scale private cloud and virtualization platforms at CERN, currently managing infrastructure that spans 10k+ servers and tens of thousands of VMs across multiple datacenters. He combines hands-on systems architecture (HA virtualization, Hyper-V clustering, MS SQL mirroring) with cloud-native automation using OpenStack, Puppet and bespoke lifecycle integrations for authentication and resource management. At CERN he led the evolution and online upgrades of critical services, drove capacity planning and stabilized environments during major scale-outs, and authored training and workflows for operators and users. Jose is also an active backend contributor to core OpenStack projects (Keystone), improving token validation, credential handling and performance-sensitive controllers. Known for bridging research-grade requirements with production reliability, he thrives on making complex, cross-platform systems predictable and maintainable. Fluent in multiple languages and scripting ecosystems (Java, C#, Python, PowerShell, Perl), he brings deep operational judgement to cloud architecture decisions.
14 years of coding experience
16 years of employment as a software developer
Master Degree, Computer Engineering (Ingenieria Informatica), Master Degree, Computer Engineering (Ingenieria Informatica) at Universidad de Oviedo
Spanish, English, French
Github Skills (10)
caching10
service-provider10
backend10
service-design10
python10
back-end-development10
apidoc9
api9
testing8
sql5
Programming languages (6)
Github contributions (5)
openstack/keystone
Jun 2013 - Jul 2021
OpenStack Identity (Keystone). Mirror of code maintained at opendev.org.
Role in this project:
Backend Developer
Backend DeveloperContributions:14 commits in 8 years 2 months
Contributions summary:Jose primarily contributed to the backend of the Keystone identity service, focusing on bug fixes and performance improvements. They addressed issues related to EC2 token validation, allowing the cleaning up of non-existent group assignments, and adding caching to trust role validation and credentials. Their changes involved modifications to core components such as assignment controllers, token models, and credential management, demonstrating a deep understanding of the system's architecture.
openstack
cernops/keystone
May 2015 - Aug 2016
Contributions:1 PR, 46 pushes, 25 branches in 1 year 3 months
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