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Day 98: Building a Holiday Planning App - My AI Tool Experiments

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leadership100-daysaicodingprototypingproductivityfull-stackexperimentation

Are you still managing team holidays with endless Excel sheets?

After jumping from one meeting to the next with barely a moment to breathe and code, I recently felt that familiar frustration:

I miss building things. I had ideas in my head, but no time to get my hands dirty and code.

Last weekend, inspired by Alexey's recent Substack on experimenting with AI tools, I finally took a break from the chaos and decided to create something again.

The Result

๐Ÿ‘‰ A full-stack Holiday Planning App.

Not a simple static page โ€” a real app with structure and logic.

Under the hood:

โœ… Supabase Postgres Database

โœ… Secure Authentication (Admins invite users)

โœ… Different UI + permissions for each role

โœ… No more static spreadsheets for each year

โœ… Integrated school holidays and German national holiday

๐Ÿงช Tools I Tested

ChatGPT for better prompts

I uploaded a final design photo of the app and used ChatGPT to refine my prompts.

๐Ÿ’™ Lovable

I entered the prompts to create a beautiful UI and design web. Much cleaner output than Cursor.

๐Ÿ’ป Cursor

Ran into repeated bugs โ€” I tried fixing them 6โ€“7 times โ€” but it struggled with the complexity.

๐Ÿš€ Google Antigravity (Gemini 3 Pro)

Solved the bug on the first attempt.

Great error explanations + step-by-step implementation help.

This was the strongest overall experience.

๐Ÿ”ง โœจ My Takeaway

AI is an incredible creative accelerator if you actually use it.

Don't overthink โ€” just test, build, break things, and try again. I often hear people say they want to "develop themselves in AI," yet take no action.

For anyone curious about AI development:

Start experimenting. It's the fastest way to learn.


This is part of my "100 Days as Head of Data and Cloud" series. Follow along as I share insights, challenges, and learnings from this new leadership role.

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