Your team may not have enough developers allocatable to refactoring tasks. They may already be busy with important functionality, and cannot afford getting distracted, just to update language or framework versions, adopt to new clean coding style. Have you been putting of unit test coverage? Or maybe you just need to review your code architecture to see how well it fits current standards. I can become part of your team to help continuously refactor your code and participate in cod review process to enforce a direction in code quality.

Some Examples of modernizations and migrations:

Zend Framework to Zend Expressive, Laminas, Mezzio

Adding Unit Tests coverage

Asp.Net Core 2.x to Asp.Net Core 3.1, 5.0+
JQuery, React to Веб Компоненты и Blazor

Intorucing MVC architecture

I can help making decision what development tools to use. You may be stuck on making an organizational decision, such as, what type of ORM to use, how to setup version control with continuous integration workflow, how to organize REST API, etc. Or maybe you do not need API at all, while SignalR with MediatR fits your needs better.

I can analyze your infrastructure and requirements to optimally choose a solution for your development workflow.

During lengthy development, common UI patterns eventually emerge, but they are not formally defined. Now, you need to properly organize and document lose chunks of spaghetti UI code into a maintainable reusable component.

Your team may not have enough developers available to complete some important tasks. The tasks may not be high priority enough to dedicate your busy staff to it, but still would like to get them done eventually. I work with clients who have sub-projects that need to be done, but no one is ever available to do them, or, ones who have an experimental idea, but do not wish to fully dedicate team resources to test its implementation.