01 - WritingMarcin Falkowski / Selected publications

The whole
notebook.

A home for my writing on software and products, alongside selected articles published on X, AEXOL and GraphQL Editor.

Notes on engineering, products and everything in between.

01

React Native / WebView / iOS / Debugging / Published on DewXIT

Debugging mobile WebViews: New Relic, an invisible iframe and an iOS crash

Tracing an iOS WebView crash from about:blank to an invisible New Relic iframe, using Xcode, Safari Web Inspector and a reproducible React Native sandbox.

02

React Native / Published on X Articles

Upgrading React Native from 0.7x to 0.85

A field guide to the New Architecture, React 19, native toolchains and the compatibility work hidden inside a major React Native upgrade.

03

Expo / Native / Published on X Articles

Requesting Device Location with Silent Push in Expo / React Native

What silent data pushes can realistically do on iOS and Android - and how to design the permission, background-task and delivery flow around their limits.

04

Engineering / Published on AEXOL

Difficulty Scales - Story Points, 1-6 Rating and Other Methods in React Native

A practical comparison of estimation scales, uncertainty and task decomposition, grounded in real React Native examples.

05

Teams / Product / Published on AEXOL

The psychology of estimation in the IT industry

Why authority bias, groupthink and planning fallacy distort estimates - and how teams can make better decisions under uncertainty.

06

AI / Product / Published on X Articles

Google Stitch: Czy zastąpi nam UI/UX Designerów?

A hands-on look at Google Stitch as a prototyping tool - useful for getting somewhere quickly, but not a replacement for production mobile UX.

07

Engineering / Estimation / Published on AEXOL

Dlaczego estymacje w software developmencie są trudne?

Why software estimates carry uncertainty, how estimation differs from pricing, and how technical teams can communicate risks and assumptions with the business.

08

React Native / GraphQL / Published on GraphQL Editor

Apollo + GraphQL Codegen implementation into a React Native application

A walkthrough of setting up Apollo Client and GraphQL Code Generator, generating typed hooks and using them in a React Native screen.

09

React Native / Tooling / Published on GraphQL Editor

React Native monorepo with shared components & TypeScript

Setting up Yarn workspaces, native project paths, Metro and a shared TypeScript package for multiple React Native applications.

02 - About the author / Białystok, Poland

Marcin
Falkowski.

Senior React Native Developer at AEXOL. Founder of DewXIT. Building mobile and web products with a practical approach to AI.

More about me

From the web.
Deep into mobile.

I'm Marcin Falkowski, a developer based in Białystok, Poland. I wrote my first lines of code in 2010. As a kid, I wanted to be a webmaster: I learned the basics of PHP, ran a modding forum for Landwirtschafts Simulator (later Farming Simulator), and explored Lua scripting. Building things for a community was what first drew me to the web.

My educational background is in mechatronics. Before mobile development, I was drawn to IoT, Industry 4.0 and smart-home systems - the meeting point of software and the physical world. I started working professionally as a developer in 2022 and eventually found my focus in mobile products.

Today I work as a Senior React Native Developer at AEXOL. My work spans mobile and web products with React Native, React, Next.js and TypeScript, from early technical decisions through implementation, release and iteration.

I stay curious about technologies and approaches beyond my main stack. I use AI as a collaborator when building and refining products: setting the direction, giving concrete feedback and checking the result against the intended experience. It helps me experiment faster while keeping responsibility for the decisions and the quality of the outcome.

DewXIT is the name behind my independent projects. My portfolio includes mam chwilę, an app for making use of short breaks; S.Z.K.W.A.Ł., an aviation radar project combining live data with AI-assisted situational assessment; SquareOne, a browser-based app icon generator; and Colorazzo, a color-palette generator. My portfolio also includes client work.

I write about the practical side of engineering: React Native upgrades, native platform limitations, estimation and the tools that affect how teams build software. I care about clear thinking, honest trade-offs and software that ships.

2010
First lines of code
2022
Working professionally
3
Platforms: iOS, Android, web

03 - Contact

Based in Poland / working globally

Let's make it
real.

[email protected]
Created by DewXIT / Marcin Falkowski / 2026Portfolio