Prefill — fill any application in 3 clicks
A browser extension that turns repetitive job-application forms into a constant 3-click action — no matter how many fields they have.
Type
Product Design
Tools
Claude Code, Paper.design
Status
Concept
Timeline
2 days
View project
Context
Applying means repeating yourself
Applying to jobs means filling the same fields over and over, LinkedIn, portfolio URL, past experience, location. Browser autofill and password managers store data, but without context: they can't tell a personal LinkedIn from a professional one, or know that “Portfolio” and “Website” are asking for the same thing.
The problem scales with how often you apply. Freelancers juggling multiple identities, studio, personal, agency, and active job seekers hitting 10+ applications a day lose minutes on every form. Prefill started as a fix for my own workflow, then became a product.
Challenge
Functional isn't designed
I used Claude Code + Paper.design to generate an MVP fast. Paper's architecture is better suited for LLM-driven prototyping, so the first pass was functional within hours.
But functional isn't designed. The AI made several UX decisions that didn't hold up:
Adding a field opened a full page
You lost visual context of where the field would land.
Fields could be saved to a different group than the one you came from.
That breaks mental models. If I'm inside Profile A and I add a field, it belongs to Profile A. Allowing cross-group saves increases cognitive load for no real gain.
Add field
The apply flow required 2 clicks per field + a profile selection each time.
For a form with 15 fields, that's 30+ clicks. The whole point of the product is to reduce friction, not redistribute it.
A "Manage in Prefill" button appeared in the UI
Unnecessary. If you're already in the app, you know where you are.
"Esc to dismiss" and "↑↓ to switch" hints were shown.
Most users click outside to close a popover and use a mouse to navigate lists. Writing out known conventions adds visual clutter without helping anyone.
Autofill in action
The AI added a sidebar navigation
The app has 2 pages: Profiles and Dashboard. A sidebar for 2 destinations wastes 21.11% of horizontal screen space.
Profiles
Process
Prototyping method:
I work vertically first (exploring different layouts: button placement, spacing, text hierarchy), then horizontally (variants of the chosen layout: colors, sizes, density). This lets me exhaust structural options before refining details.
Exploring layout directions — vertical then horizontal
Decisions
Removed the sidebar
2 pages don't justify a persistent nav. Removing it recovered 21.11% of display space and simplified the layout. Less structure on screen means less cognitive overhead before the user even starts doing anything.
Sidebar comparison — before and after
Switched from in-app flow to a browser extension.
The core insight: regardless of how many fields a form has, the number of clicks should stay constant. The extension reduces every apply action to 3 clicks: select profile, apply, done.
Before applying, there's a double verification layer: the extension shows a preview of what will be filled, and the form fields display the data as placeholders. Nothing is committed until you confirm.
Removed all unnecessary hints, no “Esc to dismiss”, no “↑↓ to switch”, no “Manage in Prefill”. Anything that doesn't help the task is noise. Per Hick's Law, fewer options means faster decisions.
Scoped actions to their context. You can only act on a profile's fields while inside that profile, no cross-group saves, no ambiguous destinations. The architecture stays flat and predictable.
Add Field uses a side panel, not a full page.
The table stays intact behind the panel. I considered retracting the table to show it in full, but that would require a transition animation that could feel disruptive for an action as lightweight as adding a single field. Keeping the background stable means zero context loss.
Result
One metric: minimum clicks
Prefill went from an AI-generated MVP with scattered UX decisions to a focused browser extension built around one metric: the minimum clicks to apply.
— 3 clicks to fill any form, regardless of field count
— 21.11% more screen space after removing the sidebar
— 3.61% tighter layout for faster target acquisition
— Zero context-switching during field management
Next
What's next
The project was a concept design, so it will not be continued , you can contact me for more information about the project