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Chat System Design
An interview-focused blog to designing a scalable chat system: durable message storage with per-conversation ordering, at-least-once delivery with deduplication, multi-device sync via per-device cursors, group chat fan-out trade-offs, and the correct role of push notifications (wake-up hint, not delivery). It also covers presence/typing as eventually consistent and the metrics you’d use to operate the system.
Khayyam Hashmi
Jan 22 · 2026
Webhook System Design
A practical, interview-focused blog to designing a reliable webhook delivery system. It covers at-least-once delivery with idempotency, correct event publishing (outbox/CDC), a delivery state machine with retries and DLQ/replay, multi-tenant fairness/backpressure, plus security (HMAC + replay prevention) and observability.
Zarish Khalid
Jan 21 · 2026
GoPuff System Design Explained
GoPuff System Design explained, covering dark store inventory, real-time fulfillment, courier dispatch, scalability, and ultra-fast delivery systems.
Mishayl Hanan
Jan 21 · 2026
Pastebin System Design
A System Design walkthrough for a Pastebin-style service: define requirements, then design a read-heavy architecture using stateless servers, cache-first reads, a paste-ID keyed datastore, and object storage for large pastes, with TTL-based expiration and basic abuse controls.
Zarish Khalid
Jan 20 · 2026
Bitly System Design Explained
Bitly System Design explained, covering URL shortening, global redirection, caching strategies, analytics pipelines, and high-availability trade-offs.
Mishayl Hanan
Jan 20 · 2026
Coinbase System Design Explained
Coinbase System Design explained, covering secure ledgers, crypto trading, wallet management, compliance, and high-availability financial systems.
Mishayl Hanan
Jan 19 · 2026
Revolut System Design interview
A Revolut-focused System Design coaching blog that teaches you to design money movement around a double-entry ledger, strict invariants, and auditability. It also covers real-world failure modes—retries/duplicates, FX volatility, and partner delays—and how to stay correct through idempotency boundaries, derived projections, risk gates, and reconciliation.
Zarish Khalid
Jan 16 · 2026
Amazon Locker System Design Explained
Amazon Locker System Design explained, covering locker capacity management, secure pickup codes, order assignment, and scalable last-mile delivery workflows.
Mishayl Hanan
Jan 16 · 2026
Understanding the Robinhood System Design
Robinhood System Design explained, covering retail trading, order routing, risk management, ledgers, and high-availability financial platforms.
Mishayl Hanan
Jan 13 · 2026
