GitLab and Bitbucket. Nobody Would Switch. So I Built a Real-Time Mirror.

A real-time Git mirror between two platforms. Two teams. One codebase. Nobody wants to switch. Developers on GitLab, ops on Bitbucket, and management asking why nothing lines up. Everyone said pick one platform and force the switch. But real engineering is not about forcing people. So I built a bidirectional Git mirror instead - GitLab CI triggers on every push event, conflict-aware sync with branch mapping filtered by naming convention, and a retry mechanism with alerting because production sync failures at 2 AM are not optional to fix. The parts nobody warns you about: force pushes that shatter the mirror state, auth tokens expiring mid-sync on a Friday evening, webhook storms during release day flooding the pipeline queue, and two developers pushing the same file to both platforms at the exact same moment. Every single one of these happened. Every single one needed its own fix. The hard problem was not the sync itself - it was all the ways sync can silently fail without anyone noticing for days. End result: sync latency under 30 seconds, zero drift between platforms, and the cross-team blame game completely gone. Both sides kept their preferred tool, the codebase stayed…