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Services Overview
Holistic software investment consulting
Software Delivery
Accelerate quality software development
Product Management
Launch modern product orgs
Legacy Modernization
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
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About
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What's a test double?
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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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Developers
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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
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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
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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
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Developers
Developers
Developers
A lesson in type safety with TypeScript, Remix and Prisma
Learn from real-world coding experiments with TypeScript, Remix, and Prisma. Discover how to avoid common pitfalls and improve your type safety skills.
Joseph Lozano
Joseph Lozano
Software tooling & tips
typescript
Double Agent Profile: Eric Newbury
Eric Newbury
Eric Newbury
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Developers
Developers
Developers
How to balance software architecture goals with limited resources
Dive into how smart resource management can transform your software architecture without breaking the bank. Join us for a journey through strategic planning and agile execution.
Eve Ragins
Eve Ragins
Maximize software investment
architecture
agile
budgeting
Magician with trick rings
Developers
Developers
Developers
Creating email-based passwordless authentication in Rails
Discover the step-by-step guide to implementing email-based passwordless authentication in your Rails app. Create secure and seamless user experiences with magic links!
Justin Searls
Justin Searls
Software tooling & tips
rails
ruby
security
Double Agent Profile: Cliff Pruitt
Cliff Pruitt
Cliff Pruitt
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Double Agent Profile: Pier-Luc Faucher
Pier-Luc Faucher
Pier-Luc Faucher
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Developers
Developers
Developers
Best books and resources for software developers
Explore our top picks for books, talks, and tutorials on software development, business, and productivity. Perfect for consultants looking to excel in their field.
Cathy Colliver
Cathy Colliver
Software tooling & tips
professional-growth
consulting
conference-talk
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Developers
Developers
Developers
A better way to sort Ruby objects: How our Put gem makes sorting by multiple conditions easy
The go-to way to sort Ruby objects by complex criteria is Enumerable's sort_by method. Here's how Test Double's Put gem makes your sorts clearer, terser, and nil-safe.
Justin Searls
Justin Searls
Software tooling & tips
ruby
open-source
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