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Services Overview
Holistic software investment consulting
Software Delivery
Accelerate quality software development
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Launch modern product orgs
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Renovate legacy software systems
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DevOps
Scale infrastructure smoothly
Upgrade Rails
Update Rails versions seamlessly
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Build tech & product teams
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Accelerate Quality Software
Software Delivery, DevOps, & Product Delivery
Maximize Software Investments
Product Performance, Product Scaling, & Technical Assessments
Future-Proof Innovative Software
Legacy Modernization, Product Transformation, Upgrade Rails, Technical Recruitment
About
About
About
What's a test double?
Approach
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The origin of our mission
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Culture
Culture & Careers
Double Agents decoded
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Great code for great causes
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Equity, diversity & inclusion
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Bold opinions and insights for tech leaders
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Essential coding tutorials and tools
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Insights for great software & great teams

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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Developers
Developers
Developers
Pydantically perfect: A beginner’s guide to Pydantic for Python type safety

Introducing Pydantic, a powerful library for type-safe data models in Python. Let’s go through the creation of a simple Pydantic model and the benefits provided.

Gabriel Côté-Carrier
Gabriel Côté-Carrier
Software tooling & tips
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Developers
Developers
Developers
C# and .NET tools and libraries for the modern developer
Patrick Coakley
Patrick Coakley
Software tooling & tips
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Leadership
Leadership
Leadership
Turning observability into a team strength without a big overhaul
Gabriel Côté-Carrier
Gabriel Côté-Carrier
Legacy modernization
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Developers
Developers
Developers
Why I actually enjoy PR reviews (and you should, too)
Robert Komaromi
Robert Komaromi
Software tooling & tips
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Double Takes

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Double Takes

Whenever this kind of thing happens, the biggest mindset shift is not going from single tool to platform (though that's useful to translate to business use cases), it's what happens when you realize there's an entire ecosystem at play here. 🤯

Cathy Colliver

TIL you can use redirect.github.com in links to avoid a back reference being created on github from commits, comments, PRs, etc.

Jason Karns

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

Wow, 1 month for a rewrite seems a little aggressive.

Dustin Tinney
Explosion of calendars surrounding a person
Developers
Developers
Developers
How to synchronize JSON date formats for accurate data comparison
Learn how to handle date comparisons in JSON data using jq, a powerful command-line tool. This guide walks you through normalizing timestamps across different time zones and provides practical jq snippets to streamline your data processing tasks.
S Frost
S Frost
Software tooling & tips
data-engineering
data-science
automation
open-source
Leadership
Leadership
Leadership
Embracing clarity: Shifting away from a culture of certainty
If your organization feels stuck, and you’re continuing to push features that seem to fail in the marketplace, perhaps you’re stuck in the Culture of Certainty. That’s okay, because you’re not alone.
Michael Toland
Michael Toland
Communication & teams
communication
product-innovation
professional-growth
teams
Developers
Developers
Developers
Code generation tools are easy to start, but hard to master
Software consultant Daniel Huss has experimented with using Copilot. Here's his review of code generation tools as a developer.
Daniel Huss
Daniel Huss
Software tooling & tips
ai-ml
Leadership
Leadership
Leadership
How product managers turn ideas into profit (and prevent disasters)
Product managers do more than prioritize backlogs—they help align strategy, reduce waste, and deliver software that customers love, ensuring long-term success.
Test Double Editorial Board
Test Double Editorial Board
Product management
budgeting
kpi
Icon illustration showing a speaker blasting noise that overwhelms a person
Developers
Developers
Developers
Work around Rails schema noise with one weird trick
Discover a simple and effective trick to handle unwanted changes in db/schema.rb on your Rails projects. Perfect for lazy developers!
Kevin Baribeau
Kevin Baribeau
Software tooling & tips
rails
testing
Airplane taking off
Leadership
Leadership
Leadership
From aerospace to DevOps: 4 surprising lessons for better software
Think compliance is boring? Think again! Discover how lessons from high-risk industries can lead to high-quality, sustainable code that saves time and money. 🚀 #DevOps #SoftwareDevelopment
James Zimmerman
James Zimmerman
DevOps & security
regulatory-compliance
consulting
Laptop displays Flutter logo
Developers
Developers
Developers
Getting the exercises in Programming Flutter working
Flutter and Dart have had some updates since the book Programming Flutter was published in 2020. Let's look at the updates that will allow you to get the exercises in the book working.
Josh Justice
Josh Justice
Software tooling & tips
flutter
Terminal screen showing Typescript example
Developers
Developers
Developers
A quick guide to TypeScript conditional types
Discover how to leverage TypeScript conditional types to enhance your code's type accuracy and reusability. Get practical tips and elevate your TypeScript skills.
Lewis M Sparlin
Lewis M Sparlin
Software tooling & tips
typescript
automation
javascript
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