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How-to guides, tooling tips and real-world advice for developers and product managers tired of broken software. Let’s fix this mess together.

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A tree made of LEGO with deep roots and a magnifying lens

Healthcare software teams keep fixing symptoms: Real problems run deeper

Healthcare engineering and product teams spend more time managing technology than improving care. Original survey data, industry research, and expert interviews reveal the macro trends and investment patterns holding healthcare software back in 2026.

Cathy Colliver

Legacy modernization

Ensō (Zen circle) with digital flourishes

🐍 Functionally Zen

Kyle Adams

Future-proof innovative software

Crab working on a tiny laptop in a sandbox on top of a desk with monitors in the background

Get in the box: Illustrated permissions guide to make Claude chill

Joé Dupuis

Nesting boxes unfold from decorative to scaffolding to hardware

We're about to unwind fifty years of "Progress"

Doc Norton

Double Takes

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Double Takes

TDDing with Claude is like having a pair that removes all the failing assertions every time you go to the bathroom.

Steve Jackson

State machines are the answer for those seeking determinism in the era of AI agents.

Dave Mosher

A Slack conversation left Doc reflecting on what bug bashes say about the systems we work in.

Doc Norton

Test-driven development is to programming what double-entry bookkeeping is to accounting.

Neal Lindsay

The fundamental character flaw of the software creator is not the misguided belief that they can solve any problem with software. Instead, it is the belief they can understand how their own software works before they create it.

Steve Jackson

We may need a SaaS appendix for Zawinski's law:

Any SaaS platform attempts to expand until it is a social network.

Matt Jones

testdouble.js 2.0: your new go-to for JavaScript testing

Check out the latest release of testdouble.js 2.0! Packed with new features and improvements, it's designed to make JavaScript unit testing smoother and more effective.

Justin Searls

testing

java

javascript

teams

open-source

Large and in charge: Using Git LFS for large projects

Explore why Git Large File Storage (Git LFS) is critical for handling large files in your projects and how it enhances your version control strategy.

Michael Schoonmaker

Michael Schoonmaker

DevOps & security

architecture

docker

rails

infrastructure

People collaborating on a presentation

Tips for clearer code slides in presentations

Ever struggled with code slides in presentations? Learn tips to make them more engaging and easy to follow, boosting your next presentation's impact!

Josh Greenwood

Communication & teams

elm

testing

communication

The Compiler as an integration test

Life after nil: Learning about type systems

Learn the benefits a type system adds to your coding with Haskell. Forget about nil, declaratively model your domain, and allow the compiler to drive.

Sam Jones

Software tooling & tips

ruby

testing

conference-talk

Pie chart

Building a well-factored pie graph with React and D3

Discover how to effectively integrate React and D3 to create a seamless, interactive pie graph. Learn the strategy behind separating state management and graph presentation for optimal results.

Sam Jones

Software tooling & tips

react

javascript

testing

Justin Searls speaking next to a slide reading Midwestern Programming

How to scratch an itch: A creativity talk

Justin Searls has a strange theory: what if creativity is like a chronic illness fueled by toxic emotions and character flaws?

Justin Searls

Communication & teams

consulting

testing

communication

conference-talk

Key about to go into a lock

Streamlining SSH authentication with tmux: A guide to hassle-free sessions

Tired of SSH and tmux conflicts? Learn how to streamline SSH authentication with tmux in our step-by-step guide. Say goodbye to frustrating access issues!

Adam Lukens

DevOps & security

automation

testing

Justin Searls stands next to a banner reading The Silent Majority Stands with Ruby

Keep Ruby weird again

The video depicts known JavaScript agitant Justin Searls, who spoke for approximately 27 minutes at RubyConf 2016 with a message that advocated restoring Ruby to its former prominence in the open source software community.

Justin Searls

Software tooling & tips

ruby

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Technology is a means to an end: answers to very human questions. We want to connect with other folks who share that belief.

Ways to connect

Test Double Executive Leadership Team

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