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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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Tradeoffs chart for changeability, cost, and reliability

What is legacy software in the age of AI?

Software becomes legacy by succeeding long enough to accumulate the weight of every decision and shortcut made along the way. Users feel it as friction. Engineers feel their momentum slip. The business watches costs climb. AI changes two of those. The third may be getting worse.

Todd Kaufman

Legacy modernization

Three people emerge from darkness toward light and a neon green path

In the age of AI we’re in this together

River Lynn Bailey

River Lynn Bailey

Cognitive hazard study diagram showing a laptop, coffee mug, and documentation sinking into a tarpit

Organizational observability: The AI alignment problem starts upstream

Dave Mosher

$Puzzled math meme with a rubber duck wearing a fedora and trench coat$

The shockingly simple math for why we need test automation

Gabriel Côté-Carrier

Gabriel Côté-Carrier

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

Double Agent Profile: Minnie Lee

Minnie Lee

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Policy update: We’re still remote

Don’t waste time commuting to an office. Test Double will continue to be a 100% remote software development company that values autonomy and flexibility.

Todd Kaufman

Recruiting & careers

remote-work

Double Agent Profile: Joel Helbling

Joel Helbling

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Learning from each other: our Pride Month stories

Explore our team's personal stories and lessons about the LGBTQ community this Pride Month. Join us in celebrating growth and understanding.

Christine McCallum-Randalls

Christine McCallum-Randalls

Equity, Diversity & Inclusion

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Double Agent Profile: Jennifer Konikowski

Jennifer Konikowski

Jennifer Konikowski

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Double Agent Profile: Neal Lindsay

Neal Lindsay

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How to find and remove dead CSS

How to find and remove dead CSS

People hate maintaining CSS for lots of reasons, but figuring out if it's safe to delete old styles is a vexing problem without any great solutions. Here's one way to do it by using, of all things, code coverage!

Justin Searls

Software tooling & tips

automation

Why we switched from DEI to EDI

Learn how Test Double's shift from DEI to EDI is making a meaningful impact on our company's culture and strategy, putting equity at the forefront.

Christine McCallum-Randalls

Christine McCallum-Randalls

Equity, Diversity & Inclusion

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You're N.E.A.T.!

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

Learn about our team

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