Author

Błażej Kustra

DevRel at Software Mansion, working on Argent. After 6+ years building React Native and universal apps for clients, I'm now helping make mobile dev tools less painful. I maintain open source libraries like react-native-effects and react-compiler-marker, build indie apps like CookinBuddy, and lately spend way too much time with AI agents.

Writes about

OtherAIReact Native

Find Author on

ArticlesLatest from Błażej

Prompts Shouldn’t Be Tested by Eye. Here’s How to Measure Them Properly

Most people write a prompt, test it on a couple of examples by hand, and call it a day. If the outputs look good , they ship it. I've done this. You've probabl...

Błażej Kustra•

Jun 2, 2026•8 min read

Three code editor windows with Android icons

AI, React Native

What I Learned Running 3 Claude Agents in Parallel for a Week

Three projects, three agents, one week, and a lot of lessons I didn't expect. A month ago, I shipped three open source React Native libraries. Not one at a tim...

Błażej Kustra•

Apr 8, 2026•6 min read

Onboarding screens for iOS, Android, and web

React Native

Onboarding in React Native Doesn’t Have to Be Hard

Onboarding is usually the first thing users see in your app and it’s surprisingly hard to get it right in React Native. Most developers either hack together a...

Błażej Kustra•

Oct 30, 2025•2 min read

Dynamode v1.0.0 title graphic on a blue background

Other

How to Handle DynamoDB Streams the Easy Way in Typescript

If you’re someone who regularly works with AWS and DynamoDB, you may well be familiar with the challenges associated with handling DynamoDB Streams. They are i...

Błażej Kustra•

Mar 24, 2024•2 min read

TypeScript flattening example graphic showing nested object keys becoming a dot path

Other

Deep-flatten TypeScript type

“How deep does the rabbit hole go?” 💊 a famous line from the Matrix movie often comes to my mind when dealing with complex recursive types in TypeScript. Nest...

Błażej Kustra•

Jan 7, 2024•5 min read

Other

Modeling with DynamoDB made easy in Typescript

Amazon’s DynamoDB is an exceptional NoSQL database, famous for its scalability and performance. But let’s spill the tea here: while it’s a fantastic database s...

Błażej Kustra•

Oct 2, 2023•6 min read