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Overview
A URL shortening service with real-time click tracking, QR code generation, and an analytics dashboard. Built with focus on low-latency redirections and collision-free hash generation.
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Key Contributions
- ◆Designed backend for unique short URLs using hashing strategies
- ◆Implemented minimal-latency redirection system
- ◆Built click tracking with QR code generation
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Engineering Deep Dive
Uses base62 encoding of an auto-incrementing counter with salt for enumeration prevention. In-memory cache handles 95% of redirects without DB hits. Click tracking uses write-behind batching every 5 seconds.
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Challenges
- ◆Hash collision avoidance at scale
- ◆High read traffic API design
- ◆Real-time analytics pipeline
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Learnings
- ◆URL-safe encoding strategies
- ◆Database indexing for reads
- ◆Analytics pipeline design
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