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

Listen to Database Changes through the Postgres WAL

An in-depth guide to listening to Postgres database changes through the WAL. Covers logical replication, publications, replication slots, and an Elixir implementation.

Binary Pattern Matching in Elixir

Decode bits and bytes into meaningful parts using the magic of Elixir pattern matching.

11 October 2025

elixir

Stop Loading Large Ecto Fields by Default

Why Ecto queries slow down with large JSON fields and how to use 'load_in_query' to skip unnecessary data loads.

03 October 2025

ecto

postgres

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.