Design Google Docs / Collaborative Editing — System Design Walkthrough
End-to-end design for a collaborative editing system. Operational Transformation vs CRDTs, presence, cursors, persistence, conflict resolution, and the realities at scale.
System-Design
Design Instagram / Photo-Sharing — System Design Walkthrough
How to design a photo-sharing platform: media upload pipeline, image processing, feeds (timelines), follow graph, search, and the operational realities.
Design a Distributed Rate Limiter at Scale — Beyond Single-Redis in 2026
When single-Redis stops being enough. Sharded rate limiters, hybrid local/global counters, sliding-window approximations, fairness, and the patterns from CDN-scale services.
Design a Notification System — Email, Push, SMS, In-App in 2026
End-to-end notification system design. Channels, templates, preferences, fan-out, batching, deduplication, observability, and the patterns from production.
Design a Payment System — Stripe-Style Architecture in 2026
Production-grade payment system design. Idempotency keys, double-entry ledger, async fulfillment, webhook handling, PCI scope, fraud rails, and the patterns Stripe-style products use.
Design a Search System — Elasticsearch, OpenSearch, and Postgres FTS in 2026
End-to-end search system design. Engine choice, indexing pipeline, ranking, hybrid search with embeddings, multi-tenancy, and the operational realities.
Design a Distributed Task Queue — Production Patterns That Scale
End-to-end system design for a distributed task queue. Durability, ordering, retries, dedup, fairness, scheduling, dead-letter handling, and the implementation patterns on Postgres, Redis, NATS, or Kafka.
Design Uber — Location Tracking, Dispatch, and Surge in System Design
A complete system design for a ride-hailing platform. Geohash / S2 / H3 indexing, real-time location ingestion, dispatch matching algorithms, ETA prediction, surge pricing, and the operational realities at scale.
Design YouTube / Video Streaming — A System Design Walkthrough
A complete system design for a YouTube-style platform. Upload, transcoding to HLS/DASH variants, storage at petabyte scale, CDN delivery, adaptive bitrate, recommendations, and the operational realities.
Design WhatsApp / Chat — A System Design Walkthrough
End-to-end system design for a WhatsApp / Telegram-style chat. WebSocket fleet, message storage, delivery receipts, online presence, group chat fanout, end-to-end encryption, and the operational realities of running it at scale.