Google Docs clone and a custom load balancer which routes requests to multiple backend instances based on document url.

Features:

• Real time collaboration and rich presence using Operation Transform
• Authentication via email
• Sticky sessions
• Autocomplete
• Search (among all documents)

Frontend technologies used:

• React
• Sharedb (collaborative UI)
• quilljs (text editing)
• rich-text (supports bold, underline, italics, etc)

Backend technologies used:

• Elasticsearch (autocomplete/search)
• mongodb (database)
• mongoose (odm)
• express (server)
• nodemailer (mail authentication)
• multer (image upload)

This was deployed on multiple cloud instances, loadbalanced application side.