Who's OOO
Open-source leave management built with an AI development team. Live at whoisooo.app.
Stack
PHP 8.5, Symfony 7.4, MySQL, Slack API, Docker, self-hosted
Model
Open source, free self-hosting, optional managed hosting
Built by
Koneko Lab AI dev team, directed and reviewed by a human senior engineer
The problem
Small teams manage time-off across spreadsheets, Slack DMs, and forgotten calendar invites. Existing SaaS solutions charge per seat, and most require data to leave the company's own infrastructure. That is a blocker for EU teams with internal policies against cloud-only HR data.
What we built
A leave management app with a calendar UI, Slack-based approvals, and free self-hosting. Teams can deploy it on their own infrastructure, or subscribe to a managed instance. Who's OOO is also how we demonstrate the AI development team process without violating client NDAs: the repo is public, so you can read the commit history, the architectural decisions, and the deployment configs in full. The codebase runs on PHPStan level 8 with 97% test coverage, the same quality bar we hold client work to.
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