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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
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Build tech & product teams
Technical & Product Assessments
Uncover root causes & improvements
Case Studies
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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
Meeting you where you are
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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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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
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Power up scripts for Rails apps Part 3: Kubernetes

In part 3 of the three part series on Rails scripts, learn about short shell scripts for simplifying Kubernetes interactions from Rails apps.

Ed Toro
Ed Toro
Software tooling & tips
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Developers
Developers
Developers
Power up with Rails scripts Part 2: Docker
Ed Toro
Ed Toro
Software tooling & tips
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Developers
Developers
Developers
Power up with Rails scripts Part 1: Environment setup
Ed Toro
Ed Toro
Software tooling & tips
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Developers
Developers
Developers
Pydantically perfect: Normalize legacy data in Python
Gabriel Côté-Carrier
Gabriel Côté-Carrier
Software tooling & tips
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Double Takes

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Double Takes

Dave Mosher explores using LLMs as digital archivists and resurrects his old GeoCities website. (Remember those!)

Dave Mosher

Davemo shares early experiments with Sora 2: discovered some interesting remix bugs and played around with applying it towards a game idea he's been noodling on.

Dave Mosher

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

Doc Norton

Friday afternoon hot take (after a couple months of engineering exclusively with coding agents):

Context/prompting is a crutch that will only get you so far.

The AI agent does not have a true understanding of both:

  • The business logic that the code it is generating represents
  • The wider system(s) that it is being written to run within

IOW the why of the code.

The result is that no matter how hard you try it is not able to consistently apply rules and/or conventions (eg: logically organizing/co-locating code).

Tom Nightingale

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
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Leadership
Leadership
Leadership
How an early-stage startup engineering team improved the bottom line fast
A fast-growing startup was burning cash faster than it could scale. Here’s how smart engineering decisions helped them improve the bottom line.
Jonathon Baugh
Jonathon Baugh
Maximize software investment
efficient software
security
outcomes-over-outputs
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Developers
Developers
Developers
End-to-End Testing Auth Flows with Playwright and Next.js
Streamline authentication testing in your Next.js applications, regardless of your auth provider. This practical guide demonstrates how to use Playwright's powerful features to create reusable test helpers, implement efficient session caching, and debug with confidence.
Dave Mosher
Dave Mosher
Testing
testing
typescript
react
efficient software
Three people embark on a journey
Developers
Developers
Developers
ESOP explained: How employee ownership really works at Test Double
Being 100% employee-owned means every Test Double agent shares in the company’s success. Here’s how our ESOP works and why it matters.
Todd Kaufman
Todd Kaufman
Communication & teams
teams
communication
community
esop
esop
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Leadership
Leadership
Leadership
Audentes Fortuna Iuvat: being bold amidst uncertainty
What should businesses do in the face of uncertainty? This is not the first time leaders are dealing with strange economic environments, and it won’t be the last.
Ed Frank
Ed Frank
Maximize software investment
budgeting
efficient software
eliminate-waste
outcomes-over-outputs
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Developers
Developers
Developers
LLMallard: the low-key AI chat bot you secretly need
The most perfect dev workflow for taking advantage of deeply powerful AI tooling that’s hyper efficient on token usage with minimal API calls—and the perfect pair programming partner.
Daniel Huss
Daniel Huss
Software tooling & tips
ai-ml
communication
developer-experience
productivity
Complex system of gears and pipes
Leadership
Leadership
Leadership
Why we coach the system, not just the team
Slow delivery isn’t usually about your people—it’s about your system. Shifting focus to incremental improvements in the system helps change not just processes but behaviors for lasting change.
Doc Norton
Doc Norton
Future-proof innovative software
communication
teams
scaling-challenges
consulting
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Developers
Developers
Developers
Developer QA checklist for feature releases
Quality Assurance is a mindset integrated throughout development to catch issues early, build user trust, and reduce maintenance costs. These recommended procedures for dev teams without dedicated QA roles establish collective responsibility for ensuring feature stability, functionality, and usability before release.
Lee Quarella
Lee Quarella
Software tooling & tips
testing
developer-experience
quality
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Developers
Developers
Developers
From engineer to consultant: The powerful shift from inward to outward focus
What transforms a skilled software engineer into an exceptional consultant? Approach new codebases with respect rather than judgment, embrace constraints as creative boundaries, and prioritize client needs over personal preferences.
Dave Mosher
Dave Mosher
Recruiting & careers
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