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Routinly
Forge an Ironclad Routine
Next.js 15TypeScriptTailwindCSSAuth.jsPostgreSQL
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Overview
Built a full-stack habit tracking platform focused on behavioral retention through gamification. Users build consistent routines using XP systems, streak tracking, and progression mechanics with a science-backed 21-day challenge framework.
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Key Contributions
- ⚔Architected SSR-based application using Next.js for improved performance and SEO
- ⚔Designed normalized PostgreSQL schema for habits, streaks, and user progression
- ⚔Implemented gamification engine (XP, levels, streak decay logic)
- ⚔Built authentication system with session persistence
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Engineering Deep Dive
The XP system uses a logarithmic progression curve — early levels come fast to hook users, while later levels require sustained consistency. Streak decay logic handles timezone changes using UTC-normalized timestamps with a configurable grace period. The PostgreSQL schema uses denormalized reads with normalized writes, achieving sub-100ms dashboard API responses.
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Challenges
- ⚔Streak recalculation logic with timezone edge cases
- ⚔Optimizing server-client data flow for real-time XP updates
- ⚔Balancing gamification engagement without feeling gimmicky
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Learnings
- ⚔PostgreSQL schema design for time-series habit data
- ⚔Server-side rendering optimization with Next.js 15
- ⚔Behavioral design principles for user retention
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