Two Sum & Hash-Map Lookup Pattern
Trade space for time using a hash map to convert O(n²) pair-finding into O(n) single-pass lookups. Foundation pattern behind dozens of LC problems.
generaljavapythontypescript
Full-Stack Engineer
Frontend + Backend combined. Strong on integration, auth flows, deployment.
Primary categories: frontend · backend · system-design
Curriculum (4 topics)
LRU Cache, Hash Map + Doubly Linked List
O(1) get/put cache with bounded capacity by combining a hash map (key → node) with a doubly linked list (recency). One of the most-asked LC mediums across Mag7.
generaljavapythonsystem-design+1
Design a URL Shortener (TinyURL / bit.ly)
Classic system-design starter. Tests capacity estimation, ID generation, read-heavy storage, caching, and analytics. Asked at Amazon, Microsoft, Uber, LinkedIn.
generalsystem-design
STAR & STAR-L Method for Behavioral Stories
Structured story format used by every Mag7 behavioral round. Google extends to STAR-L (Learnings). Amazon expects 1 LP per story. Netflix tunes to culture pillars.
behavioralgeneral