Engineered a high-concurrency multiplayer collaboration backend using Node.js and WebSockets (Socket.io) to power real-time collaborative editing. Implemented custom CRDT logic to safely merge simultaneous user inputs without conflicts or data loss. Designed a horizontally scalable architecture with Redis Pub/Sub, synchronizing thousands of concurrent events with sub-100ms latency for a "Google Docs-style" experience.
Full-stack ownership of automated seat provisioning and billing lifecycle management for a SaaS resource management platform. Implemented robust subscription logic, proration, and downgrade/upgrade flows, ensuring accurate billing across multi-tenant organizations.