Build an API Key Management System Premium
Design an API key platform that issues scoped keys with per-key rate limits, propagates revocations to all gateway nodes within 1 second, and provides usage analytics per key without adding latency to the hot path.
Build a Distributed Rate Limiter Across 100+ API Gateway Nodes Premium
Design a rate limiter that enforces per-user and per-tenant request limits globally across a horizontally scaled API gateway fleet, with no single coordinator bottleneck and sub-milliseclient enforcement latency.
Build a DRM Token Vending System for Premium Video Premium
Design a digital rights management system that issues short-lived playback licenses to authenticated subscribers, prevents license sharing across accounts, and revokes access instantly when a subscription lapses.
Build an Enterprise SSO System Federating 500 SaaS Applications Premium
Design a Single Sign-On platform that federates identity across 500 SaaS applications using SAML and OIDC, enforces MFA policies, and propagates user deprovisioning to all connected apps within seconds of an account being disabled.
Build JWT Auth System at Production Scale Premium
A production-grade deep dive into designing a complete JWT authentication system: architecture, login flow, request verification, token rotation, key management, and security hardening.
Build an OAuth 2.0 Authorization Server Premium
Design an OAuth 2.0 authorization server that supports PKCE for public clients, implements refresh token rotation to detect theft, and provides a token revocation endpoint that propagates across all resource servers within seconds.
Build a Schema Registry for Event-Driven Systems Premium
Design a schema registry that enforces backward and forward compatibility for Kafka topics, prevents breaking changes from reaching production, and lets consumers evolve independently of producers.
Build WhatsApp Message Delivery with Offline Queuing Premium
Design an end-to-end encrypted messaging system that delivers messages to online users in under 100ms, queues messages durably for offline users, and guarantees delivery exactly once when they reconnect.