Julien Danjou
Co-Founder & CEO at Toulouse SaaS Club
Toulouse, Occitania, France
Summary
🤩
Rockstar🎓
Top SchoolJulien Danjou is a seasoned open-source software leader and entrepreneur with over two decades of experience building scalable systems, founding projects like Gnocchi and the awesome window manager, and contributing to 100+ projects including high-profile OpenStack components and Python's typeshed. As Co-Founder and CEO of Mergify he combines product vision with deep engineering expertise to automate CI/CD workflows, merge queues, and intelligent CI issue detection for developer teams. Previously he built the Python profiler at Datadog and led OpenStack telemetry efforts at Red Hat, demonstrating a rare ability to move projects from research to production at large scale. An author of Serious Python and an active investor and advisor, he blends technical craftsmanship with community-building—founding local initiatives like the Toulouse SaaS Club and running Byte Brigade. Beyond code, he’s an Emacs and tooling veteran who has literally sent code to Mars through robust engineering practices, and he remains hands-on across backend systems, typing/validation tooling, and observability.
21 years of coding experience
21 years of employment as a software developer
DUT Computer Science, DUT Computer Science at Université Le Havre NormandieMaster Computer Science, Master Computer Science at University of South Brittany
English, French
Stackoverflow
500reputation
422kreached
13answers
1question
Github Skills (82)
python10
package-management10
clientside10
testing10
authentication10
type-system10
metaprogramming10
data-validation10
stubs10
locking10
servicenow10
implicit-typing10
emacs-lisp10
decorators10
optional-typing10
Programming languages (26)
Github contributions (5)
openstack/glance
Sep 2012 - Dec 2015
OpenStack Image Management (Glance). Mirror of code maintained at opendev.org.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:27 commits in 3 years 3 months
Contributions summary:Julien primarily contributed to the OpenStack Glance image management service by addressing bugs and improving the codebase. They removed notifications on error, refactoring the error handling. Furthermore, the user updated the codebase to use 'notifications' as the default notification queue name, aligning with the practices of other OpenStack projects. Several commits involved logging errors within the registry to improve debugging.
openstack
openstack/python-keystoneclient
Jan 2013 - Oct 2015
OpenStack Identity (Keystone) Client. Mirror of code maintained at opendev.org.
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 commits in 2 years 9 months
Contributions summary:Julien primarily focused on refactoring and improving the `keystoneclient` library. They removed unnecessary imports and code, streamlined endpoint retrieval, and addressed token expiration handling. Their contributions enhanced the library's efficiency and reliability by optimizing token management and code structure.
openstack
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