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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
Technical Recruitment
Build tech & product teams
Technical 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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Insights
All Insights
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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Practical advice for real-world challenges
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Developers
Developers
Developers
Understanding legacy application rewrite vs. refactor tradeoffs

Understanding legacy application rewrite vs. refactor pros and cons can be difficult, especially if you’ve never experienced the possibility of changing it for the better. Let's look at a few examples to learn more and outline a small decision making framework to help you evaluate your path forward.

Shawn Rinehart
Shawn Rinehart
Legacy modernization
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Developers
Developers
Developers
Pydantically perfect: seamlessly handle non-Pythonic naming conventions
Gabriel Côté-Carrier
Gabriel Côté-Carrier
Software tooling & tips
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Developers
Developers
Developers
Field Report: Rails World 2025
Mike Bowman
Mike Bowman
Community
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Developers
Developers
Developers
Pydantically perfect: A beginner’s guide to Pydantic for Python type safety
Gabriel Côté-Carrier
Gabriel Côté-Carrier
Software tooling & tips
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Double Takes

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Double Takes

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

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
C# and .NET tools and libraries for the modern developer
C# has a reputation for being used in legacy projects and is not often talked about related to startups or other new business ventures. This article aims to break a few of the myths about .NET and C# and discuss how it has evolved to be a great fit for almost any kind of software.
Patrick Coakley
Patrick Coakley
Software tooling & tips
.NET
C#
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Leadership
Leadership
Leadership
Turning observability into a team strength without a big overhaul
By addressing observability pain points one at a time, we built systems and practices that support rapid troubleshooting and collaboration.
Gabriel Côté-Carrier
Gabriel Côté-Carrier
Legacy modernization
legacy-modernization
communication
dev-experience
teams
Two people discuss a pull request review
Developers
Developers
Developers
Why I actually enjoy PR reviews (and you should, too)
PR reviews don't have to be painful. Discover practical, evidence-based approaches that turn code reviews into team-building opportunities while maintaining quality and reducing development friction.
Robert Komaromi
Robert Komaromi
Software tooling & tips
communication
dev-experience
efficient software
eliminate-waste
productivity
Two monitors show incremental changes to a web development project
Developers
Developers
Developers
Build with HTMX: Simplify development with a return to fundamentals
Modern web development embraced complexity with frameworks like React, but at what cost? HTMX is a lightweight, progressively enhanced alternative, embraces web fundamentals, and reduces dependency overhead. Through a side-by-side comparison of identical applications built with React and HTMX, this screencast and blog explores the benefits of a hypermedia-first approach and when it might be the right choice for your projects.
Dave Mosher
Dave Mosher
Software tooling & tips
dev-experience
ux-ui
react
What it’s like to work as a consultant at Test Double
Considering transitioning from senior software engineer or product manager to consulting? Test Double has created space for software and product consultants to work how they work best.
Anya Iverova
Anya Iverova
Recruiting & careers
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Developers
Developers
Developers
How modern frontend teams approach automated testing
Modern frontend testing doesn't need to be overwhelming—focus on two types of tests that deliver real value: co-located unit tests using tools like Vitest and Testing Library, plus targeted E2E tests for critical user flows. This practical approach helps product teams move fast while maintaining confidence, without getting bogged down in testing theory or arbitrary coverage metrics.
Robert Komaromi
Robert Komaromi
Testing
automation
ci-cd
testing
quality
Feature backlog that's out of control
Leadership
Leadership
Leadership
Why hiring more developers costs more than you think
Scaling challenges are rarely caused by a lack of developers or how many lines of code are written each sprint. Let’s explore challenges caused by prematurely expanding your team—and why you’re less likely to scale your productivity and more likely to scale your existing bottlenecks.
Shawn Rinehart
Shawn Rinehart
Maximize software investment
communication
teams
tech-debt
dev-experience
productivity
Paint splashes turn into a beautiful piece of art
Leadership
Leadership
Leadership
Building software teams that manage mistakes rather than rejecting them
The software industry shares a pervasive assumption that expert developers don’t make mistakes. Developers are only human. They will make mistakes. Ignoring that means any mistake can lead to a high intensity event. There’s a better way. Invest in systems to manage inevitable mistakes.
Gabriel Côté-Carrier
Gabriel Côté-Carrier
Communication & teams
agile
communication
productivity
professional-growth
teams
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