System DesignBuilding a Rate Limiter with the Sliding Window PatternOne misbehaving client can take down your API. See why fixed-window rate limits get exploited, and how the sliding window pattern with a deque fixes it.BrainyTech Team · 8/18/2026Read →
System DesignThe LRU Cache — and How It Powers API Response CachingYour API can't cache everything forever. See how HashMap + Doubly Linked List gives O(1) get/put — and how this exact pattern powers real API caching.BrainyTech Team · 8/14/2026Read →
System DesignHow We'd Design a URL ShortenerHow does bit.ly turn a long URL into 7 characters without collisions? We break down the hashing, Base62 encoding, Python code, and scaling trade-offs.BrainyTech Team · 8/14/2026Read →
