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Services
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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
Cycle icon
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
Insights
Insights
All Insights
Hot takes and tips for all things software
Leadership
Bold opinions and insights for tech leaders
Developer
Essential coding tutorials and tools
Product Manager
Practical advice for real-world challenges
Say hello

Legacy Modernization

Thinking about a big rewrite?Don’t do it!

You don’t need rewrite headaches or the risk that comes with it. Unwind legacy systems and unlock potential. Take advantage of market opportunities far faster without wasting buckets of money.

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Rewrite risks
Refresh systems
Automated testing
Rewrite options
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Rewrite risks

Why rewrites are so hard (and expensive)

Rewrites have a bad reputation for good reason. The most expensive thing you can do in software is rewrite an entire system.

Rewrites are also scary scope creepers:

  • Complexity overload
  • Legacy dependencies
  • Lack of understanding
  • Scope creep
  • Testing nightmares
  • User experience disruption
  • Code area lockdown
  • Software standstill

Refactor safely

Renovate legacy systems for maintainable software

Everyone wants their codebase to be easier to maintain. Getting there is another story. Legacy system modernization and refactoring is not the most glamorous work. But we honestly enjoy that kind of challenge. Legacy rescues are our speciality because our experienced software consultants have seen just about everything.

We’ll remove blockers, safely factor your codebase, and share knowledge. You and your team get a legacy system that’s easier to maintain now and in the future.

Tech & Techniques

We also speak a bunch of languages, frameworks, tooling, and techniques. And we’ll meet your team where they are, using your tools and processes.

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Automated Testing Suites
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Release Monitoring
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Performance Analysis & Improvements
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Production Monitoring
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Incident Response
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Test Driven Development
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Regression Testing
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End-to-End Testing
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Integration Testing
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Data Architecture
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Software Architecture
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a11y
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UI/UX
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Agile, Shape Up & More
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Standard Ruby
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Standard Rails
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Your tools & processes
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Automated Testing

Automated testing to fit your team

We have a lot of thoughts about testing, but we’re not dogmatic about it. Your situation is as unique as your team and your codebase. We’ll help your team focus on solid practices for building automated end-to-end tests as part of their daily activities.

We’ll meet you where you are, then make recommendations on how to make automated testing work best for your team. So your test suite is able to evolve at the same pace as your codebase.

Working with industry-leading clients:

Cars company logoenbala company logoGusto company logoGitHub company logo

Rewrite Options

Okay, but really: what about rewrites?

We get it. Sometimes there are unavoidable reasons to choose a rewrite. We’ve worked on rewrites to enable business critical, system-wide innovation.

And we’re pros at making scary stuff boring. But, if you’re considering a rewrite of your legacy codebase, it’s crucial to carefully weigh the costs, risks, and benefits before investing. We can do a free office hours session to help you evaluate your decision.

Testimonial
Empathetic Collaborators
Test Double wasn’t just in a rush to fill open seats. Instead, they worked with us as a business partner to ensure optimal technical and cultural fit.
Jeff MacAuley
Enbala
Testimonial
Holistic Problem Solving
Kenneth delivered features quickly from week one and enabled us to catch the school sales cycle for our new product. He also did extra credit beyond the sprint: raised the bar on automated testing and proactively helped ramp up new team members. Kenneth reshaped my views on the value an embedded contractor can bring to a team.
Marco Kitagawa Pedroso
Clever
Testimonial
Holistic Problem Solving
No task is too big or small, too glamorous or dirty—they are all handled with care and attention to detail. Test Double has been by far my favorite consulting experience in my career.
Greg Heidorn
Cars

We get things done across software development and product management

We’re multi-threat software consultants. Find out more about our other solutions.

Discover more

Legacy Modernization case studies

See all case studies
Enbala
Scaling a distributed energy management system
Cars.com
Retooling for a robust, modern infrastructure
Gusto
A Ruby on Rails upgrade with no interruptions

Legacy Modernization insights

See all insights
Leadership
Leadership
Leadership
Why legacy code rewrites are the hardest job in software

Legacy codebases are often like tangled mazes, with convoluted logic, outdated practices, and patches upon patches. Here's what you need to know about rewriting vs. refactoring a legacy codebase.

Test Double Editorial Board
The end of legacy code
Developers
Developers
Developers
The end of legacy code

What if you could change our relationship with legacy code, and shed the weight the name brings with it? What if legacy code disappeared? In this RailsConf 2023 talk Daniel Huss shares how.

Daniel Huss
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Developers
Developers
Developers
Mastering automated refactoring tools: A practical guide

Dive into our practical guide on using automated refactoring tools to understand and enhance your code. Learn key techniques and boost your coding confidence today.

Daniel Huss
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We’re the team on a mission to improve how the world builds software.

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