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James Montemagno

Live, Love, Bike, and Code.

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Latest posts

Introducing PDF Diff: Compare PDFs Privately in Your Browser

Hey friends! I'm super excited to share a new tool I've been working on that solves a problem I bet many of you have faced:  how do you quickly compare two PDF documents to see what changed? Enter PDF Diff! Landing page for PDF Diff

Introducing Oh My Posh Visual Configurator: Finally, a Drag-and-Drop Terminal Theme Builder! ✨

A web-based drag-and-drop builder for oh-my-posh that makes creating beautiful terminal prompts actually fun!

Building a Complete FIRE Calculator App with GitHub Copilot in One Chat Session

In 30 minutes with GitHub Copilot, VS Code, and Claude Opus 4.5 I built my ultimate FIRE calcultor app that is private, secure, and free!

Building Better Apps with GitHub Copilot Custom Agents

Custom agents are here to customize and optimize how coding agents work on your code, here is my experiment with the WinForms agent.

5 Ways I Use Background Coding Agents Every Day

Coding agents are different from in-editor chat and agent modes for AI assisted programming. They run asynchronously—often in the cloud—tackling tasks while you focus locally. I rely heavily on the GitHub Copilot coding agent and its VS Code integration to spin up multiple parallel workflows.

Announcing Hotkey Typer — type long prompts with a hotkey

When I'm recording demos or making videos I often need to reproduce long prompts or blocks of text on-screen. Manually retyping them every time is slow and error-prone, and pasting from the clipboard can feel jerky and reveal private content. I wanted a tiny, reliable app

Introducing Bingo-o-matic: Your Ultimate Bingo Management App

Introducing Bingo-o-matic a comprehensive bingo management application designed to make hosting and playing bingo games easier and more enjoyable than ever before.

Developing & Working with .NET Containers on Windows ARM Devices

I am by no means a cloud-native developer, I am a client developer. I have spent some time though to get a general understanding about microservices, images, containers, docker, and all the buzz words that surround the topic. I recently got really into DevContainers and using them on GitHub

Using Java SDK 11 on Xamarin Android Builds on Azure DevOps & GitHub Actions

Everything is building great in your CI/CD pipeline and then BOOM your build fails for no reason. You didn't change anything in your code!?!?! That was me this morning as I was updating my InAppBilling Plugin for .NET. I got hit with this beauty: error XA0031: Java

Developing Android Apps on Windows Arm Devices

On a Windows Arm device and looking to develop Android apps? Here are the options to deploy and test applications.

Automate Posting to Mastodon via Web Requests

Super simple way to automating posting statuses to Mastodon via web requests using the Mastodon API for services such as IFTTT.

Enabling Users to Manage Subscriptions on iOS/Android

Let's take a look at how easy it is to implement a Manage Subscriptions action on iOS/Android to adhere to the new guidelines.

App Configuration Settings in .NET MAUI (appsettings.json)

Learn how easy it is to use an appsettings.json in your .NET MAUI app for complete control over configuration.

Implementing In-App Subscriptions in iOS & Android with no backend servers

Subscriptions can be tricky to implement on iOS and Android. I break down why you may want to introduce subscriptions and strategies for your app

Goodbye Android Emulators, the Windows Subsystem for Android is Here!

Get out of here Android emulators! You can now use Windows 11 and the new Subsystem for Android to develop on Intel or AMD machines!