04 / FULLSTACK APPLICATIONS
TeamHabit
Habit tracking with goals, teams, and challenges. A fullstack project with authentication, a database, and a multilingual interface.
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The objective
Connect personal habits to goals and teamwork. The implementation covers habit logging, progress, challenges, and rewards, with Supabase as the backend.
My contribution
- Developed the idea and defined habit tracking and user experience features.
- Worked on design decisions, testing, troubleshooting, and improvements over several iterations.
How I worked
I used Codex and other AI tools extensively for code implementation. My work focused on developing the idea, defining functionality, making design choices, testing, troubleshooting, and improving the product over several iterations. The technical overview describes the implementation; it does not imply that I wrote all the code independently.
Technical challenges & approach
Access to personal and team data
Supabase Auth identifies the user. Database setup includes tables, access policies, and functions that check team membership, among other conditions. Separate TypeScript modules handle habits, goals, teams, and challenges. Security also depends on applying the correct SQL setup to the hosted database.
Progress rules and edge cases
Streak calculations use local calendar dates. Vitest tests cover empty history, duplicate dates, and interrupted streaks. The repository also includes tests for authentication state, usernames, and XP. These help assess the rules but do not replace integration tests of the hosted service.
A multilingual user experience
next-intl and separate translation files support six languages. The login page has visible field labels and provides the public entry point. Authenticated features were reviewed in code, not exercised with a real user account during this review.
Learning focus
The project connects a simple interface action to user identity, ownership, database operations, and progress calculations. It makes the distinction between client checks and database access controls particularly important.
Project scope
The public login page was checked. Authenticated workflows, hosted database setup, and production access control were not verified end to end. Progress figures in the screenshot are login-page illustrations, not documented user results.