Hey, I’m Peter! Developer & Educator.

I'm a Senior Elixir developer with a Psychology background, PragProg Author, Public Speaker and Blogger, and Founder. I'm passionate about Software Architecture, Product Engineering, and sharing knowledge.

Products

Building Table Views with Phoenix LiveView

Data is at the core of every business, but it is useless if nobody can access it. This book shows you how to generate business value by making your data accessible with advanced table UIs.

Build an MVP with Elixir

New to Elixir? This video course gets you started by developing a real-world product using Phoenix LiveView, deploying it to Fly.io, adding payments to it using LemonSqueezy, and more.

Building Forms with Phoenix Liveview

Creating forms in LiveView is easy - until it's not. This course teaches you how to build forms like a pro and to avoid the pitfalls along the way.

Blog Posts

Test async work in Elixir with assert_eventually

Test async tasks in Elixir without using Prosess.sleep but by - get this - actually waiting for them to complete!

05 February 2025

elixir

testing

Replace Generic UI Copy with Your User's Domain-Specific Terms Using Gettext Domains

Learn how to dynamically replace generic UI copy with your users' domain-specific terms using Gettext domains.

12 January 2025

gettext

phoenix

Request Routing and Sticky Sessions in Phoenix on Fly.io

Learn to efficiently route requests to the right server using Fly.io's fly-replay header and sticky sessions with Phoenix.

Parse a Regex with NimbleOptions

Learn how I discovered that ~r-sigils return Regex structs and how to include regex patterns as valid input in NimbleOptions.

A Bluesky Starter Guide for Elixir Devs

Join the Elixir community on Bluesky. Learn account setup, find peers, and smoothly transition from X. Key steps for efficient migration.

Easy Mocking in Elixir

Quick, dependency-free mocking in Elixir tests. Learn how to configure your mock once and use it everywhere. Simple and effective for all test suites.

The Saga Pattern in Elixir

Explore the Saga pattern in Elixir for managing complex, multi-step processes. Learn about choreography and orchestration approaches, with code examples for implementing long-lived transactions.

Resurrect your Phoenix Context

A retraction: I changed my mind about Phoenix contexts. Here's how I structure my Elixir code with a simpler, more effective design in the true functional way.

Handle Phoenix Exceptions gracefully

Silence the noisy Phoenix.NotAcceptableError and Plug.CSRFProtection.InvalidCSRFTokenError exceptions in your Phoenix application by implementing the Plug.Exception protocol for them.

13 April 2024

phoenix

Distribute your Files Globally with Tigris and Fly.io

Serve your files quickly to users all around the globe with just a small configuration change using Tigris' globally distributed S3-compatible storage solution.