Nobody knows who’s bringing dessert.
A concept feature for coordinating shared responsibilities, right inside WhatsApp's group chats.
INDUSTRY.
Communication
Tools.
Figma, pen & paper
Role.
UI/UX Design
THE OPPORTUNITY
Everyone's talking. Nothing's getting coordinated.
WhatsApp connects over 3 billion people — but the moment a group tries to organize something, the app that's so good at talking becomes surprisingly bad at coordinating. Snack duty for the game, the volunteer shifts, who's on drinks — it all dissolves into a scroll of half-answered messages until someone gives up and pastes a SignUpGenius link.
The problem: messaging apps are built for conversation, not for tracking who committed to what. So I designed a way to close that gap — a lightweight Sign-Up that lives right inside the chat. The hard part wasn't the feature. It was earning a place in an app people around the world already know by heart, without adding a single thing that felt new. Here's how I got there. ↓
THE PROCESS
The problem wasn't the tools. It was leaving the chat to use them.
I've felt this in my own group chats — but a hunch isn't enough. So I talked to the people who live in these threads — parents, sports coordinators, family planners, community organizers — and looked at how they cope today with tools like SignUpGenius, Doodle, and Google Forms.
The frustration wasn't missing features. It was the switching — leaving the app, opening a browser, pasting a link back, and hoping everyone actually taps it. That's where coordination quietly falls apart. People didn't want a more powerful tool. They wanted just enough structure, right in the chat, with no learning curve.
Two personas kept me honest — Peter, holding a 40-person team chat together, and Anna, who volunteers then loses track in the flood.
That reframed the project:
• How might we add structure to a chat without adding weight?
• How might we let people claim a task without leaving the conversation?
• How might we make commitments visible at a glance — without scrolling?
Those pointed to a clear direction: something lightweight, something that already felt like WhatsApp, something you could use without thinking. Which turned out to be the hard part.
THE DESIGN CHALLENGE
It had to feel native to WhatsApp
Three principles shaped the work: lightweight (purposefully scoped, not a project manager crammed into a chat), familiar (WhatsApp's existing visual and interaction language, nothing new to learn), and frictionless (as few taps as possible to create a Sign-Up or claim a slot). The constraint was the creative challenge — I couldn't invent new patterns or add navigation that could break the very simplicity that makes WhatsApp work.
The hardest call in the project: I considered letting the attachment menu reorder itself — surfacing the Sign-Up option first when the app sensed people coordinating in the chat. It was tempting: less hunting, faster discovery, especially the first time.
But the more I tested it, the clearer the cost became. Reordering a menu people navigate by reflex — even "smart" reordering — breaks the spatial memory that makes the app feel effortless. I'd be solving discoverability by spending the very thing I was trying to protect.
So I didn't build it. Instead, I surfaced the feature contextually — a gentle AI prompt when the app detects coordination language ("Want to create a Sign-Up?"), plus a subtle highlight on the existing icon, right where it always sits. Same discoverability. None of the disruption.
Two rounds of testing shaped the iterations:
AI-powered suggestion text when app detects coordination happening
Date/Time input fields + automated reminders
Subtle guidance text encouraging organizers to pin
Participant names + slot count
Commitments reversible with a tap
A lightweight Sign-Up that lives right in the thread
Created, claimed, and tracked without anyone leaving the chat. Built entirely in WhatsApp's existing style, so it works like something that was always there.
