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Commits on Jun 30, 2025

• Implement complete Event Sourcing pattern with full functionality

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• Add Event Sourcing and Saga Pattern problems for fintech interviews

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• Implement API client with retry logic and exponential backoff

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• Simplify API client interview problem for easier implementation

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Commits on Jun 29, 2025

• Simplify money handler implementation for interview preparation

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• Refactor currency definitions to use dictionary instead of class

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• Complete payment interview preparation with comprehensive guides

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• Add comprehensive webhook delivery implementation guide

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• Implement webhook delivery system with retry logic

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• Refactor queue stats to use dynamic priority iteration

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• Implement payment processing queue with priority handling

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• Refactor circuit breaker for cleaner code structure

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Commits on Jun 28, 2025

• Add circuit breaker documentation and simplify stats

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• Implement circuit breaker pattern with state management

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• Add transaction cache documentation

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• Simplify transaction cache implementation

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• Implement complete LRU transaction cache with TTL expiration

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• Refactor rate limiter implementation for clarity and consistency

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• Implement sliding window rate limiter for payment attempts

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• Clean repository structure and add all payment interview problems

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• Update README with comprehensive problem ordering from most to least likely

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• Fix Producer item generation and improve system implementation

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• Complete Producer, Consumer, and ProducerConsumerSystem implementation

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• Implement BoundedBuffer shutdown mechanism and fix test race condition

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• Fix Mermaid syntax errors in producer-consumer README

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• Implement basic LRU cache with TTL functionality

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• Fix Mermaid syntax errors in LRU cache README

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• Refactor: Replace bucket_info dict with TokenBucket class

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Commits on Jun 27, 2025

• Complete: day_1/problem_1_rate_limiter

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• Add ACKEND_CONCEPTS_CHEAT_SHEET to help with random trivia

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• Fix all Mermaid syntax errors across README files

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• Restructure project with individual problem READMEs and comprehensive Mermaid diagrams

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• Add comprehensive 3-day senior backend engineer interview prep with boilerplate and tests

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• Complete rewrite: Focus on pure backend coding interview questions

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• Add missing Day 1 challenges: System Design and Error Handling

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