mySystemDesign

BEGINNER TO ADVANCED

Board NxN, players, win detection, draw, extensible design

Singleton logger, log levels (DEBUG/INFO/WARN/ERROR), file appender

Strategy pattern for operations, expression evaluation, extensibility

HashMap + DLL, O(1) get/put, capacity eviction

Board, dice, players, snakes/ladders map, turn management

Base62 encoding, KV store, redirects, expiry, analytics

Random key generation, blob storage, TTL expiry, read-heavy optimisation

Token bucket, fixed window, per-user limits, Redis atomic ops

Singleton, Strategy (pricing), multiple vehicle types, ticket generation

SCAN algorithm, State machine, request scheduling, multi-elevator coordination

State pattern, card authentication, account debit, cash dispensing

State machine (Idle/HasMoney/Dispense), inventory, change calculation

Group expenses, 3 split types, debt simplification with greedy algorithm

Theatre hierarchy, concurrent seat locking, optimistic locking, payment

S3, CDN, feed fanout, follow graph, infinite scroll pagination

Fanout on write vs read, celebrity accounts, Redis sorted sets

APNs, FCM, priority queues, retries with backoff, user preferences

Trie, top-k caching, Kafka for frequency counting, Redis sorted sets

Consistent hashing, eviction policies, hot key problem, write strategies

Polymorphic pieces, move validation, check/checkmate, game state machine

ReentrantReadWriteLock, ConcurrentHashMap, sharded locks, benchmarking

Observer pattern, topic registry, async dispatch, backpressure, DLQ

WebSocket servers, offline delivery, E2E encryption, Cassandra, Kafka

HLS/DASH, adaptive bitrate, transcoding workers, CDN, deduplication

Geohash, real-time location, driver matching, surge pricing, ETA

OT/CRDT, vector clocks, conflict resolution, WebSocket broadcast

Idempotency keys, double-spend, distributed ledger, saga pattern, PCI-DSS

Web crawler, inverted index, TF-IDF, PageRank, serving layer, indexing