---
title: "React Native at Scale With Mike Duminy (Klarna)"
description: "Tune in to find out how the use of React Native and Re.Pack can impact organizational structure and how these tools help Klarna scale product development."
url: https://www.callstack.com/podcasts/react-native-at-scale-with-mike-duminy-klarna
updated: 2026-10-24T08:39:43.303Z
---

# React Native at Scale With Mike Duminy (Klarna)

Tune in to find out how the use of React Native and Re.Pack can impact organizational structure and how these tools help Klarna scale product development.

_Guests: Jakub Romańczyk, Software Engineer @ Callstack; Mike Duminy, Principal Engineer @ Klarna · Host: Łukasz Chludziński, Engineering Manager @ Callstack · Published 2023-11-30 · Duration 01:16:58 · Category: Enterprise_

Listen: [YouTube](https://youtu.be/ujO8-Z1RJRI) · [Spotify](https://open.spotify.com/episode/3PFxj05iRYUzdga2uK1FLr) · [Apple Podcasts](https://podcasts.apple.com/us/podcast/react-native-at-scale-with-mike-duminy-klarna-the/id1525543072?i=1000637037371) · [SoundCloud](https://soundcloud.com/user-985069846/react-native-at-scale-with-mike-duminy-klarna-the-react-native-show-podcast-30/s-UR5K8YJuvuk)

In the next episode of the “React Native at Scale” series, we lean a bit more towards the technology side to show you the impact that React Native and [Re.Pack](https://www.callstack.com/open-source/re-pack) can have on a large fintech organization.

To demonstrate that, we’ve invited two very special guests:

- Mike Duminy, a Principal Engineer and Domain Architect who works on scaling frontend technology at Klarna,
- Jakub Romańczyk, Software Engineer at Callstack and the maintainer of Re.Pack.

## React Native at scale in fintech

Together, we explore Klarna's business structure, the decision to use React Native, the benefits and challenges of using Re.Pack, and Klarna's release process. All of that will give you a better insight into how large-scale fintech organizations operate, what they needs are, and why React Native is well-suited to satisfy them.

We also discuss the concept of [super apps](https://www.callstack.com/blog/step-by-step-guide-to-super-app-development), the importance of optimizing bundle sizes, and the future plans for Module Federation in Klarna's architecture.

Insights

## Learn more about Enterprise

Here's everything we published recently on this topic.

[View all](https://www.callstack.com/insights)

- [Why Banking App Modernization Stalls Before It Ships](https://www.callstack.com/blog/why-banking-app-modernization-stalls-before-it-ships) (Jun 17 · Article): Learn why banking app modernization stalls when product ambition outpaces testing, release management, observability, and team coordination, and what banks need to fix first.
- [Native Apps Without a Build Step](https://www.callstack.com/events/native-apps-without-a-build-step-2) (Sep 13 · Talk): Discover Rock by Callstack: the open, modular, self-hosted framework for React Native. Built to help teams scale, migrate, and deliver faster in the evolving React Native ecosystem.
- [React Native Enterprise Framework is now Rock](https://www.callstack.com/blog/react-native-enterprise-framework-is-now-rock) (Aug 18 · Article): Rock is the new name for the React Native Enterprise Framework (RNEF). A solid foundation for enterprise-grade, cross-platform apps. Faster CI, build caching, iOS ad-hoc installs, and more.
- [Brownfield Incremental React Native Adoption x Rock](https://www.callstack.com/events/brownfield-incremental-react-native-adoption-x-rock) (Jun 24 · Talk): Learn how to smoothly adopt React Native in your existing apps using Callstack’s Rock for easier setup, faster deployment, and seamless integration.
- [Build Faster and Scale Smarter With Rock](https://www.callstack.com/podcasts/build-faster-with-rock) (Jun 10 · Podcast): Discover how Rock cuts build times, streamlines CI, and simplifies large-scale app development for growing teams.
- [From Hours to Minutes: Making Your React Native CI Builds 20x Faster](https://www.callstack.com/events/from-hours-to-minutes-making-your-react-native-ci-builds-20x-faster) (May 12 · Webinar): Discover how to skip 90% of native builds in React Native CI using Rock. Includes a live demo and cost-saving insights from Expensify’s setup.
- [Native Apps Without a Build Step](https://www.callstack.com/events/native-apps-without-a-build-step) (Apr 24 · Talk): Learn how Callstack’s new React Native framework slashes CI times and simplifies enterprise-scale mobile development.
- [Why You Need Rock](https://www.callstack.com/events/why-you-need-rock) (Mar 27 · Webinar): Learn more about Callstack's Rock straight from its creators.
- [We’re Building a New React Native Framework](https://www.callstack.com/blog/were-building-a-new-react-native-framework) (Mar 14 · Article): Meet a React Native framework designed for enterprise apps, optimizing build reuse, CI speed & cloud integration while staying flexible and self-hosted.