Amazon Machine Coding Interview

Inheritance, Enums, Strategy Pattern

Search & Strategy Penalty Logic

State Pattern (Idle/Dispense)

Decorator Pattern, State Pattern, Inventory Checks, Thread-Safe Brewing

Entity Modeling, Game Loop

Scalable N×N Board & Win Strategies

Validator Strategy & Command Move Reversal

State, Strategy (Dispatching)

Token Bucket, Sliding Window

Strategy Formatter & Asynchronous Composite Sinks

Factory Method, Strategy Pattern, Decorator Pattern, Rate Limiting

Snowflake Strategy, Clock Providers, Resilient Clock-Skew Backoffs, Thread-Safe Bitwise Math

Strategy Pattern, Generics, Concurrent Read-Write Locks, Eviction Mechanics

Nested Transactions & Command Logs

Lease Management, Fencing

Guest vs Logged-in Merge

State Machine, Event-driven

Weighted Average, Spam Filter

Normalization, Entity Matching

Rule Engine, Stacking Logic

Promotion Engine, Tax Logic

Stacking Policy, Atomic Usage

Concurrency, Transactional Locks

Two-Phase Reservation, TTL Cleanup, Observer Pattern, Thread-Safe Inventory Decrements

Overbooking, Global State

NDCG, Feature Engineering

Command & Composite Patterns, State Synchronization, Observer Registry, Bounded History Logs

Doubly Linked List Logic

TTL, Base62 Encoding