Test Double
@testdouble.bsky.social
Our mission is to improve how the world builds software. And we do that by building both great software and great teams.
Nine years running! We are proud to share that Test Double has made #Inc5000.
We help companies modernize aging systems, adopt AI in ways that return value, and move faster without cutting corners. We're grateful to keep doing that work, year after year! More: https://link.testdouble.com/2a53bf
We help companies modernize aging systems, adopt AI in ways that return value, and move faster without cutting corners. We're grateful to keep doing that work, year after year! More: https://link.testdouble.com/2a53bf
September 17, 2026 at 5:58 PM
Nine years running! We are proud to share that Test Double has made #Inc5000.
We help companies modernize aging systems, adopt AI in ways that return value, and move faster without cutting corners. We're grateful to keep doing that work, year after year! More: https://link.testdouble.com/2a53bf
We help companies modernize aging systems, adopt AI in ways that return value, and move faster without cutting corners. We're grateful to keep doing that work, year after year! More: https://link.testdouble.com/2a53bf
We're excited to host Software Leadership Circles Live next week! Join us on September 24th in the Columbus area as we bring together 30-40 software leaders for one day, in one room, with nobody pitching anything. Request your seat: https://link.testdouble.com/be1bb9
September 16, 2026 at 2:03 PM
We're excited to host Software Leadership Circles Live next week! Join us on September 24th in the Columbus area as we bring together 30-40 software leaders for one day, in one room, with nobody pitching anything. Request your seat: https://link.testdouble.com/be1bb9
We often mistake effort for value. By combining feedback, work history, and AI, James Walker discovered that the work that felt easiest was often what others valued most. Read the blog: https://link.testdouble.com/bcbf44
September 15, 2026 at 4:16 PM
We often mistake effort for value. By combining feedback, work history, and AI, James Walker discovered that the work that felt easiest was often what others valued most. Read the blog: https://link.testdouble.com/bcbf44
Curious how AI fits into your development workflow? Rails bug you can't shake? Legacy system you're trying to modernize?
Bring it to the Double Up Lab at #RailsWorld! Stop by the Sponsor Lounge to pair with a Test Double consultant. Book a session here: https://testdouble.com/pairing-railsworld
Bring it to the Double Up Lab at #RailsWorld! Stop by the Sponsor Lounge to pair with a Test Double consultant. Book a session here: https://testdouble.com/pairing-railsworld
September 14, 2026 at 5:06 PM
Curious how AI fits into your development workflow? Rails bug you can't shake? Legacy system you're trying to modernize?
Bring it to the Double Up Lab at #RailsWorld! Stop by the Sponsor Lounge to pair with a Test Double consultant. Book a session here: https://testdouble.com/pairing-railsworld
Bring it to the Double Up Lab at #RailsWorld! Stop by the Sponsor Lounge to pair with a Test Double consultant. Book a session here: https://testdouble.com/pairing-railsworld
Most organizations expect agentic tooling to greatly increase the speed at which we write code. But there's another benefit in this new world that may not get as much as attention as it deserves: accessibility. River Bailey discusses accessibility in the age of AI. https://link.testdouble.com/ec7ae7
September 10, 2026 at 9:23 PM
Most organizations expect agentic tooling to greatly increase the speed at which we write code. But there's another benefit in this new world that may not get as much as attention as it deserves: accessibility. River Bailey discusses accessibility in the age of AI. https://link.testdouble.com/ec7ae7
Heading to #RailsWorld? Grab 30 minutes with one of our senior consultants to pair on whatever you're working through, whether it's a stubborn bug, a legacy system challenge, a tricky upgrade, how AI fits into your workflow, or career advice. 🔗 Sign up: https://testdouble.com/pairing-railsworld
September 9, 2026 at 2:43 PM
Heading to #RailsWorld? Grab 30 minutes with one of our senior consultants to pair on whatever you're working through, whether it's a stubborn bug, a legacy system challenge, a tricky upgrade, how AI fits into your workflow, or career advice. 🔗 Sign up: https://testdouble.com/pairing-railsworld
Remember when web crawlers were called "spiders"? Bots were stitching the internet together from the beginning.
Now the fabric is worn and we're all restitching it. AI tools will help. Humans decide the pattern.
https://link.testdouble.com/141dd6
Now the fabric is worn and we're all restitching it. AI tools will help. Humans decide the pattern.
https://link.testdouble.com/141dd6
September 8, 2026 at 7:18 PM
Remember when web crawlers were called "spiders"? Bots were stitching the internet together from the beginning.
Now the fabric is worn and we're all restitching it. AI tools will help. Humans decide the pattern.
https://link.testdouble.com/141dd6
Now the fabric is worn and we're all restitching it. AI tools will help. Humans decide the pattern.
https://link.testdouble.com/141dd6
79% of healthcare tech leaders cite limited budget as their top blocker. Yet the real constraint isn't money—it's solving the wrong problems. Our ongoing research points to patterns. And we've got a useful framework to start diagnosing root causes. https://link.testdouble.com/389f5e
September 8, 2026 at 4:43 PM
79% of healthcare tech leaders cite limited budget as their top blocker. Yet the real constraint isn't money—it's solving the wrong problems. Our ongoing research points to patterns. And we've got a useful framework to start diagnosing root causes. https://link.testdouble.com/389f5e
Move from "here's the story of the system" to "here's what's red and here's the intervention that makes sense for your situation." If you're considering legacy modernization, leadership needs a scored diagnosis: every finding rated on how bad and problem type.
https://link.testdouble.com/28cb6b
https://link.testdouble.com/28cb6b
September 7, 2026 at 5:20 PM
Move from "here's the story of the system" to "here's what's red and here's the intervention that makes sense for your situation." If you're considering legacy modernization, leadership needs a scored diagnosis: every finding rated on how bad and problem type.
https://link.testdouble.com/28cb6b
https://link.testdouble.com/28cb6b
A 1,000-line setup guide made onboarding feel like navigating fog. So Jeremy Fairbank built a Claude skill to be the captain: a documentation companion that guides developers through setup step by step.
Six lessons from the build: https://link.testdouble.com/5c7ba7
Six lessons from the build: https://link.testdouble.com/5c7ba7
September 4, 2026 at 2:50 PM
A 1,000-line setup guide made onboarding feel like navigating fog. So Jeremy Fairbank built a Claude skill to be the captain: a documentation companion that guides developers through setup step by step.
Six lessons from the build: https://link.testdouble.com/5c7ba7
Six lessons from the build: https://link.testdouble.com/5c7ba7
Most teams are excellent at measuring whether code is correct. Fewer know how to tell if it's actually working—or delivering the intended business impact. Read Jed Schneider's new blog, After the tests pass: https://link.testdouble.com/d98744
September 3, 2026 at 5:50 PM
Most teams are excellent at measuring whether code is correct. Fewer know how to tell if it's actually working—or delivering the intended business impact. Read Jed Schneider's new blog, After the tests pass: https://link.testdouble.com/d98744
Talk to someone else who gets it. We offer free office hours to talk about challenging problems.
Pair with an experienced software developer or product manager who will ask you curious questions to help get you unstuck. https://link.testdouble.com/b0de11
Pair with an experienced software developer or product manager who will ask you curious questions to help get you unstuck. https://link.testdouble.com/b0de11
September 3, 2026 at 2:03 PM
Talk to someone else who gets it. We offer free office hours to talk about challenging problems.
Pair with an experienced software developer or product manager who will ask you curious questions to help get you unstuck. https://link.testdouble.com/b0de11
Pair with an experienced software developer or product manager who will ask you curious questions to help get you unstuck. https://link.testdouble.com/b0de11
AI makes teams move faster. It doesn't make legacy code easier to live with. That's the kind of problem we want to dig into with you at #RailsWorld. Bring a legacy system, a question about using #AI without letting tests and architecture slip, and more: https://testdouble.com/pairing-railsworld
September 2, 2026 at 7:05 PM
AI makes teams move faster. It doesn't make legacy code easier to live with. That's the kind of problem we want to dig into with you at #RailsWorld. Bring a legacy system, a question about using #AI without letting tests and architecture slip, and more: https://testdouble.com/pairing-railsworld
Senior DevOps Consultant Joé Dupuis says stop spamming the permission button on Claude.
Learn how to set up Claude Code's sandbox so your AI agent works freely and securely without constant interruptions.
Get the illustrated guide and get in the box: https://link.testdouble.com/fef21c
Learn how to set up Claude Code's sandbox so your AI agent works freely and securely without constant interruptions.
Get the illustrated guide and get in the box: https://link.testdouble.com/fef21c
September 2, 2026 at 2:01 PM
Senior DevOps Consultant Joé Dupuis says stop spamming the permission button on Claude.
Learn how to set up Claude Code's sandbox so your AI agent works freely and securely without constant interruptions.
Get the illustrated guide and get in the box: https://link.testdouble.com/fef21c
Learn how to set up Claude Code's sandbox so your AI agent works freely and securely without constant interruptions.
Get the illustrated guide and get in the box: https://link.testdouble.com/fef21c
Foundation models are getting better and cheaper every quarter. So what's left to build a defensible product on?
We think that's people and domain expertise. We observed this first hand while partnering with Traingent to build Ride with Dave.
https://link.testdouble.com/1df281
We think that's people and domain expertise. We observed this first hand while partnering with Traingent to build Ride with Dave.
https://link.testdouble.com/1df281
September 1, 2026 at 7:08 PM
Foundation models are getting better and cheaper every quarter. So what's left to build a defensible product on?
We think that's people and domain expertise. We observed this first hand while partnering with Traingent to build Ride with Dave.
https://link.testdouble.com/1df281
We think that's people and domain expertise. We observed this first hand while partnering with Traingent to build Ride with Dave.
https://link.testdouble.com/1df281
Gifthealth hit 11x order volume growth in just over a year. We embedded 19 consultants across engineering, product, and data to help them scale amidst hyper growth without breaking their foundation.
Full field report: https://link.testdouble.com/362dd6
Full field report: https://link.testdouble.com/362dd6
September 1, 2026 at 2:46 PM
Gifthealth hit 11x order volume growth in just over a year. We embedded 19 consultants across engineering, product, and data to help them scale amidst hyper growth without breaking their foundation.
Full field report: https://link.testdouble.com/362dd6
Full field report: https://link.testdouble.com/362dd6
AI doesn't have an accuracy problem. It has a target problem.
Three Amigos, adapted for solo devs: BDD → TDD → Given/When/Then Acceptance Criteria.
Stop correcting after the fact.
Approach and useful framework tools: https://link.testdouble.com/bcf238
Three Amigos, adapted for solo devs: BDD → TDD → Given/When/Then Acceptance Criteria.
Stop correcting after the fact.
Approach and useful framework tools: https://link.testdouble.com/bcf238
August 31, 2026 at 5:35 PM
AI doesn't have an accuracy problem. It has a target problem.
Three Amigos, adapted for solo devs: BDD → TDD → Given/When/Then Acceptance Criteria.
Stop correcting after the fact.
Approach and useful framework tools: https://link.testdouble.com/bcf238
Three Amigos, adapted for solo devs: BDD → TDD → Given/When/Then Acceptance Criteria.
Stop correcting after the fact.
Approach and useful framework tools: https://link.testdouble.com/bcf238
Pair with Test Double at #RailsWorld! Bring your hardest Rails problems, legacy system struggles, and more to the Double Up Lab for 30 minutes with one of our senior consultants, matched to what you're working on.
Learn more & sign up: https://testdouble.com/pairing-railsworld
Learn more & sign up: https://testdouble.com/pairing-railsworld
August 28, 2026 at 2:06 PM
Pair with Test Double at #RailsWorld! Bring your hardest Rails problems, legacy system struggles, and more to the Double Up Lab for 30 minutes with one of our senior consultants, matched to what you're working on.
Learn more & sign up: https://testdouble.com/pairing-railsworld
Learn more & sign up: https://testdouble.com/pairing-railsworld
Is your code ready for advanced agentic tooling? River Bailey explores the foundational practices that help both humans and AI amplify good work, and avoid repeating the existing problems. https://link.testdouble.com/a31a85
August 27, 2026 at 9:01 PM
Is your code ready for advanced agentic tooling? River Bailey explores the foundational practices that help both humans and AI amplify good work, and avoid repeating the existing problems. https://link.testdouble.com/a31a85
Your Python code doesn't need more abstractions. It needs fewer moving parts.
Staff Consultant @kadams54.bsky.social lays out seven tenets for functional simplicity in Python.
https://link.testdouble.com/0a1025
Staff Consultant @kadams54.bsky.social lays out seven tenets for functional simplicity in Python.
https://link.testdouble.com/0a1025
August 27, 2026 at 4:18 PM
Your Python code doesn't need more abstractions. It needs fewer moving parts.
Staff Consultant @kadams54.bsky.social lays out seven tenets for functional simplicity in Python.
https://link.testdouble.com/0a1025
Staff Consultant @kadams54.bsky.social lays out seven tenets for functional simplicity in Python.
https://link.testdouble.com/0a1025
Test Double Co-Founder & CEO Todd Kaufman talked with Traingent Co-Founder & CEO Rikky Singh about product development in the AI era, and shares some thoughts inspired by our partnership working on Ride with Dave. https://link.testdouble.com/80b445
August 26, 2026 at 9:59 PM
Test Double Co-Founder & CEO Todd Kaufman talked with Traingent Co-Founder & CEO Rikky Singh about product development in the AI era, and shares some thoughts inspired by our partnership working on Ride with Dave. https://link.testdouble.com/80b445
We spent fifty years building software abstractions for human cognition. Agentic coding starts pulling in the other direction. @docondev.bsky.social says we may need to renegotiate the abstractions.
https://link.testdouble.com/50b4c2
https://link.testdouble.com/50b4c2
August 26, 2026 at 2:25 PM
We spent fifty years building software abstractions for human cognition. Agentic coding starts pulling in the other direction. @docondev.bsky.social says we may need to renegotiate the abstractions.
https://link.testdouble.com/50b4c2
https://link.testdouble.com/50b4c2
For decades, we've optimized code for human readers. Agentic coding is forcing a renegotiation of what "craft" means. @docondev.bsky.social argues that's shifting emphasis from code-level readability to system-level observability and problem-space incrementalism.
https://link.testdouble.com/d4da60
https://link.testdouble.com/d4da60
August 25, 2026 at 5:24 PM
For decades, we've optimized code for human readers. Agentic coding is forcing a renegotiation of what "craft" means. @docondev.bsky.social argues that's shifting emphasis from code-level readability to system-level observability and problem-space incrementalism.
https://link.testdouble.com/d4da60
https://link.testdouble.com/d4da60
Your coding agent will write tests. What it won't do, by default, is write good tests.
Mutation testing fills that gap, and it turns out LLMs benefit from it far more than human developers. Neal Lindsay breaks down the set up and getting your agent to run it.
https://link.testdouble.com/c8f60d
Mutation testing fills that gap, and it turns out LLMs benefit from it far more than human developers. Neal Lindsay breaks down the set up and getting your agent to run it.
https://link.testdouble.com/c8f60d
August 25, 2026 at 2:09 PM
Your coding agent will write tests. What it won't do, by default, is write good tests.
Mutation testing fills that gap, and it turns out LLMs benefit from it far more than human developers. Neal Lindsay breaks down the set up and getting your agent to run it.
https://link.testdouble.com/c8f60d
Mutation testing fills that gap, and it turns out LLMs benefit from it far more than human developers. Neal Lindsay breaks down the set up and getting your agent to run it.
https://link.testdouble.com/c8f60d
When leaders demand speed, teams often cut corners—creating brittleness that slows everything down. @docondev.bsky.social has advice: Real speed emerges from flow, small batches, and systems designed for adaptation, not pushing harder on execution.
https://link.testdouble.com/0655f3
https://link.testdouble.com/0655f3
August 24, 2026 at 2:00 PM
When leaders demand speed, teams often cut corners—creating brittleness that slows everything down. @docondev.bsky.social has advice: Real speed emerges from flow, small batches, and systems designed for adaptation, not pushing harder on execution.
https://link.testdouble.com/0655f3
https://link.testdouble.com/0655f3