---
title: "Sootcase: Group itineraries, finally collaborative. First GenAI travel planner shipped to both surfaces."
description: "Group travel planning is a coordination disaster. Sootcase set out to fix it with GenAI: collaborative itineraries that adapt to everyone's constraints. We led architecture and delivery from concept to synchronized web + mobile launch."
source: "https://www.kensink.com/cases/sootcase/"
---
TRAVEL · COLLABORATIVE GENAI Sootcase (US) · US

# Sootcase.  
Group itineraries, finally collaborative.

First GenAI travel planner shipped to both surfaces.

1st

GenAI collaborative planner in market

GENAI · WEB + MOBILE TRAVEL · COLLABORATIVE GENAI

## Sootcase: Group itineraries, finally collaborative. First GenAI travel planner shipped to both surfaces.

Group travel planning is a coordination disaster. Sootcase set out to fix it with GenAI: collaborative itineraries that adapt to everyone's constraints. We led architecture and delivery from concept to synchronized web + mobile launch.

[View .md](https://www.kensink.com/cases/sootcase.md)

1st

GenAI collaborative planner in market

Web + Mob

Synchronized launch surfaces

< 1 sec

Itinerary propagation latency

Joint team

Mobile + backend run by Kensink

01 · THE PROBLEM

## Where they were stuck.

Existing travel planners are single-user. Group travel, where six friends coordinate flights, hotels, activities, and budget across continents, is mostly Slack threads, half-finished spreadsheets, and dropped balls. The team wanted to ship the first GenAI-powered collaborative travel planner, on web AND mobile, AND keep them in sync.

02 · OUR APPROACH

## How we built it.

-   01 Real-time collaborative state model: every member's contribution streams into a shared itinerary via WebSocket fan-out
-   02 GenAI planner agent grounded in actual flight + hotel + activity data, with budget, time, and accessibility constraints surfaced explicitly in prompts
-   03 Web (Next.js) + mobile (React Native) share a typed API contract; itinerary edits propagate to all surfaces within a second
-   04 Conflict resolution at the activity level: if two members propose conflicting times, the planner surfaces the trade-off rather than picking silently
-   05 Eval suite for the planner: 'does the itinerary actually fit the constraints?' measured per archetype before each model release

> “We had a vision but no infrastructure. Kensink showed up with the architecture and a delivery plan, then ran the cross-functional team that actually shipped both apps on the same day.”

_Founder

Sootcase_

\[TECH STACK\]

-   TypeScript
-   Next.js
-   React Native
-   WebSocket
-   LLM API
-   Postgres

\[ENGAGEMENT\]

Duration Single engagement (2024)

Client Sootcase (US)

Shape GENAI · WEB + MOBILE

Handoff Full ownership · 90-day warranty

START YOUR OWN PROJECT

## Bring a real problem.  
We’ll bring code on day one.

[Start your own project →](https://www.kensink.com/contact) [Book a 15-min intro](https://www.kensink.com/contact)

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