Mobile apps, end-to-end
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Cristian GutuReact Native & iOS engineer · GUU Labs
25articles
10+years shipping
6apps in stores
Built for The Economist, DataCamp, myHyundai and Chemist4U.
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Practical write-ups from real projects: React Native, iOS, tooling and the business side of freelancing.
Latest · React Native
Cristian Gutu · 2 Aug 2025
react-native-get-random-values for the New Architecture
When working with cryptographic operations in JavaScript, especially in libraries like @aws-amplify/react-native, access to a secure random number generator is essential. In browsers, the crypto.getRandomValues() method is typically used for this purpose....
Cristian Gutu · 2 Aug 2025
Cut React Native Build Times by 75% with Artifact Caching
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Forward third-party Push Notifications to React Native Firebase Messaging
10 Jan 2025
Using Swift in Fabric components and Turbo Modules
25 Mar 2024
Adding a Forked Pod as a Dependency in a Podspec on iOS
24 Mar 2024
How to add DKIM and DMARC records to your email
2 Feb 2024
Optimising React Native's View component render speed
28 Sep 2023
react-native-fast-image - No flickering when changing the image source
2 Sep 2023
React Native animated bottom modal in a Native Stack Navigator
5 Aug 2023
Top quality sources to find free and paid landing page templates in 2023
6 Jul 2023
Designing a logo for GUU Labs
8 Jun 2023
Summing Sprint Estimates in Notion: Creating a Rollup Property for Total Estimates
6 Jun 2023
Debug Jest Unit Tests with VS Code breakpoints in React Native
10 Mar 2023
How to deploy on iOS 16 using Xcode 13
14 Sep 2022
How did we fix a massive CPU performance issue in our React Native iOS app
3 Jun 2022
How to fix Circular Dependencies in React Native
30 Apr 2022
Cum completezi un formular W-8BEN-E pentru PFA/SRL
16 Jan 2022
Share data between React Native and iOS widgets
30 Jul 2021
Link an AppGroup Id to your iOS App
29 Jul 2021
Register a new AppGroup Id on iOS
28 Jul 2021
Register a new App Id on iOS
27 Jul 2021
A nice use-case for React Native Portals
5 Apr 2021
Cum am găsit primul client
1 Feb 2021
Testing code in React Native
21 Oct 2020
Another React Native upgrade story
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