Distributed Availability Ledger
A high-concurrency booking and availability engine resolving conflicts in real-time across multiple calendar networks.
Year
2024
Services
Architecture Scope
- —Multi-network calendar sync
- —High-concurrency booking locks
- —Distributed queue scheduler
- —Automated reminder routing
- —Availability search index
5M+
Events Synchronized
Across Google & Microsoft
100%
Conflict Prevention
Zero double-bookings
150ms
Query Response Time
Near-instant availability
45%
Admin Overhead Saved
Automated routing workflows
The Challenge
Multi-party booking systems suffer from race conditions, double-bookings, and timezone translation errors across Google, Microsoft, and CalDAV systems. Standard polling setups are too slow to catch overlaps, while high-frequency database updates lead to locking under load.
The Solution
We engineered a distributed scheduling ledger. The engine polls and listens to external calendar providers via webhooks, compiling a real-time availability cache. It uses optimistic locking and queue-based booking pipelines to guarantee conflict-free slot allocation.
System Architecture
The application relies on Next.js Server Components and a PostgreSQL backend. A Redis-backed distributed lock manager (Redlock) coordinates bookings across identical slots. Background sync processes are managed using scheduled jobs, pulling updates continuously with low API quota consumption.
Technology Stack
- Next.js
- TypeScript
- PostgreSQL
- Prisma
- Redis
- OpenAI API
- Google Calendar API