Slimify
High-throughput URL shortener, link analytics engine, and QR synthesis API
Backend Engineer
2024
API & Backend
Production
The Operational Problem
Marketing campaigns and transactional SMS workflows required a redirection service capable of sub-50ms redirect speeds without incurring exorbitant SaaS tier pricing as monthly click volumes scaled into millions.
Engineering Approach
Engineered an aggressive Redis caching layer in front of a PostgreSQL relational database. Active short codes resolve directly from memory, while click events are asynchronously ingested into a background buffer to prevent database lock contention.
Key Implementation Decisions
In-Memory Edge Redirection
Utilized Redis key-value lookups with LRU cache eviction to deliver link redirects with an average server response time under 15ms.
Asynchronous Click Ingestion
Decoupled redirect response from click logging using an in-memory queue that flushes batched analytics records to PostgreSQL every 5 seconds.
SVG & PNG QR Code Generation
Built an on-demand API endpoint that generates vector QR codes with customizable color schemes, error-correction levels, and embedded logos.
Architecture & System Highlights
Verified Outcomes & Impact
- Handled over 500 requests per second in load testing with zero dropped connections
- Achieved average redirect turnaround under 18ms
Technologies & Libraries
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