---
title: "Same Destination, Different Roads: Migrating a Live App at Scale"
description: "Łukasz Chludziński compares Greenfield and Brownfield approaches to migrating a live app, weighing continuity, delivery speed, cost, and risk."
url: https://www.callstack.com/events/same-destination-different-roads-migrating-a-live-app-at-scale
updated: 2026-10-24T08:39:22.188Z
---

# Same Destination, Different Roads: Migrating a Live App at Scale

Łukasz Chludziński compares Greenfield and Brownfield approaches to migrating a live app, weighing continuity, delivery speed, cost, and risk.

_Talk · 10/8/2026, 10:20 AM – 11:00 AM [CEST] · Berlin, Germany · Category: React Native_

Organizer: reactCon Berlin

Speakers: Łukasz Chludziński (Engineering Manager @ Callstack)

[Event page](https://www.nextappcon.com/reactcon)

AI is making large app migrations more feasible, but moving a live product involves much more than rewriting code. Teams also need to preserve the behavior users rely on while keeping analytics, releases, and ongoing feature work intact.

Using an anonymized case study, Łukasz compares Greenfield and Brownfield approaches to modernizing a production app. React Native provides the concrete example, while the decisions apply more broadly: how to balance continuity, observability, delivery speed, organizational constraints, cost, and risk.

The talk covers Brownfield architecture, data from the project, and how proofs of concept and production reference screens helped validate the approach. Attendees will leave with a way to assess which migration path fits their own app.