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Services Overview
Holistic software investment consulting
Software Delivery
Accelerate quality software development
Product Impact
Drive results that matter
Legacy Modernization
Renovate legacy software systems
Pragmatic AI
Solve business problems without hype
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DevOps
Scale infrastructure smoothly
Upgrade Rails
Update Rails versions seamlessly
Technical Recruitment
Build tech & product teams
Technical & Product Assessments
Uncover root causes & improvements
Case Studies
Solutions
Solutions
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
Meeting you where you are
Founder's Story
The origin of our mission
Culture
Culture
Culture & Careers
Double Agents decoded
Great Causes
Great code for great causes
EDI
Equity, diversity & inclusion
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Hot takes and tips for all things software
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Bold opinions and insights for tech leaders
Developer
Essential coding tutorials and tools
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Developers
Developers
Developers
Quality you can’t generate: AI is only as good as your constraints

AI changed the cost structure of software. It didn't change the value structure. The value is no longer the code you write. It's the taste, judgment, and constraints you encode into the system that shapes what AI produces.

Dave Mosher
Dave Mosher
Pragmatic AI
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Leadership
Leadership
Leadership
Why we're not chasing the AI hype (And what we're doing instead)
Todd Kaufman
Todd Kaufman
Pragmatic AI
Leadership
Leadership
Leadership
Speed is a side effect of making the system work
Doc Norton
Doc Norton
Maximize software investment
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Developers
Developers
Developers
IndyPy Talk: Pydantically perfect in every way
Kyle Adams
Kyle Adams
Software tooling & tips
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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
Wooden pegs sit at intersection of a network diagram
Developers
Developers
Developers
Do we need dependency injection in Ruby?
Curious about dependency injection in Ruby? Learn why it can improve your code quality and testing practices with insights from an experienced software consultant.
Kevin Baribeau
Kevin Baribeau
Accelerate quality software
ruby
testing
Business types hanging out on the back of a train
Leadership
Leadership
Leadership
Running a business, demystified
In this RailsConf 2018 talk, Test Double co-founders Todd Kaufman and Justin Searls answer 12 questions from the development community about starting and scaling your own business.
Todd Kaufman
Todd Kaufman
Communication & teams
teams
communication
founders
My shiny new React application followed by a yacht
Developers
Developers
Developers
Effective React testing
Learn the ins and outs of different types of tests and how to test your React application in Jeremy Fairbank's talk from JazzCon 2018.
Jeremy Fairbank
Jeremy Fairbank
Testing
react
testing
conference-talk
open-source
Please don't mock me
Developers
Developers
Developers
Please don't mock me
Justin Searls boils down nearly a decade of practicing test-driven development with JavaScript to summarize the Do’s and Don’ts of poking holes in reality when writing tests.
Justin Searls
Justin Searls
Testing
api
javascript
testing
ruby
conference-talk
Leadership
Leadership
Leadership
The consultant's code: Building trust in effective software consulting
Explore the essential strategies for building trust in software consulting. Learn how to foster strong client relationships and deliver quality results.
Dave Mosher
Dave Mosher
Accelerate quality software
consulting
communication
teams
Orange toy robot
Developers
Developers
Developers
Getting started with FFI: Rust & Unity
Explore how Rust can take your Unity game to the next level with enhanced performance and robust features. Dive in to find out more.
Michael Schoonmaker
Michael Schoonmaker
Accelerate quality software
rust
ruby
testing
Developers
Developers
Developers
How to manage conditionals in code effectively
Conditionals in code can be as invasive as Asian carp. Learn how to manage them effectively with these practical strategies to keep your code clean and maintainable.
Sam Jones
Sam Jones
Accelerate quality software
testing
Agent Dossier: Brittany Moore
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Test Double double agents at retreat
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Test Double double agents at retreat
Test Double double agents at retreat
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Test Double double agents at retreat
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