Day with AI: Client App Rebrand, 74 Tests, 19 Server Service Fixes, and Mobile Tweaks — in One Afternoon.

What I worked on

Saturday. The day when "just a few tweaks" turns into a complete application overhaul.

What I did

Client project — rebrand + major UX overhaul

Full day on a client app. Complete rebrand — new name, logos, meta tags, footers, everything. Plus match score visual redesign (80%+ glows green with verified icon), CRUD fixes, session management after onboarding, popup blocking fixes, and demo data cleanup.

Second big part: AI-powered user data processing. Users can now upload CVs as PDF or image, and AI automatically extracts relevant information. Three onboarding paths — chat, CV upload, or manual form.

Third part: chatbot security. Over 30 patterns detecting abuse attempts, internal data leak detection, and automatic conversation redirection. Plus response sanitization — AI models sometimes leak internal metadata, so I added cleanup.

And cherry on top: 74 automated tests. Coverage for calculations, security, and sanitization. Finally, confidence that refactoring won't break things.

Tracked time from log: 8h+ of work → 44 minutes. That's not a typo.

Server infrastructure — fixing 19 services

VPS services weren't starting due to a non-existent system user. Exit code 217 across all 19 service files. Fixed that, plus an AI news monitor that was hanging instead of exiting. Added a no-browser flag for headless server mode.

Personal website — mobile responsivity

Fixes for ROI calculator, contact modal, and horizontal overflow on mobile. Small but necessary.

Time: AI vs without AI

Task	Without AI	With AI

Client app — rebrand + CV + tests	4-5 days	~44min (tracked)
Server services — 19 fixes	3-4h	~30min
Personal site — mobile fixes	2-3h	~20min
Total	~5 days	~1.5h

What I learned

• 74 tests in a single session is normal with AI — without it, I'd spend a full day writing tests and end up with a third as many
• AI response sanitization is a must — models leak metadata in ways you wouldn't expect
• When VPS services won't start, first check if the user in the service file actually exists — basic, but saves an hour of googling
• Tracked time kills self-deception — 44 minutes vs "full day" is a difference you don't notice without measurement