🦦 Golang Low Level Design Problems¶

A collection of 3 Low-Level Design (LLD) problems implemented in Go, following CSP (Communicating Sequential Processes) and design patterns — curated for backend developer interviews.

🎯 Preparing for the round itself? See the LLD Interview Playbook (language-neutral, with Java and Go concurrency equivalents).

📋 Project Index¶

#	Project	Domain	Key Patterns
1	Web Crawler	Concurrency	Worker Pool, Fan-Out/Fan-In, Pipeline
2	In-Memory KV Store	Data Structures	Strategy, Singleton, Min-Heap
3	Task Queue / Worker Pool	Async Processing	Worker Pool, Pipeline, Priority Queue

🚀 How to Run¶

Each project is self-contained. Navigate to the project directory and run:

cd golang-low-level-design/<project-name>
go run <main_file>.go

🧩 Design Patterns¶

Pattern	Usage
Worker Pool	Controlled concurrent task processing
Strategy	Eviction policies (LRU, LFU, TTL)
Pipeline	Task → Process → Result flow
Fan-Out/Fan-In	Distribute work, collect results
Exponential Backoff	Retry with delay to prevent thundering herd
Context Cancellation	Graceful shutdown of goroutines

📖 Interview Preparation¶

Each project includes: - THOUGHT_PROCESS.md — Design reasoning and trade-offs - CODE.md — Implementation walkthrough with code snippets - HIGH_LEVEL_DESIGN.md — Production architecture and scale - INTERVIEW_QUESTIONS.md — Common interview questions with answers