Windows Forms, Web Forms and Classic ASP brought onto a current platform — incrementally, with the business still running on it the whole time.
A modernisation project fails in the same way a rewrite does: someone estimates it up front, the estimate is wrong, the old system is frozen while the new one is built, and eighteen months later the business is running neither. We work the opposite way round. The old system keeps running and keeps being fixed. Work is sequenced by risk and value rather than by module size, each piece moved is shippable and reversible on its own, and the parts nobody wants to touch get a test harness before they get a new implementation. It is a less dramatic story than a rewrite, and considerably more likely to finish.
The specifics, rather than the adjectives.
A management and administration console migrated from .NET Framework Windows Forms to Blazor on .NET Core, module by module, while the original stayed in use. Screens move when they are ready rather than when a big-bang deadline says they must.
New code is built alongside the old and traffic moves across a piece at a time, so there is never a weekend where everything has to work for the first time. Slower to start and far faster to finish than a rewrite, and it does not stake the business on an estimate.
Taking over long-lived applications whose original authors have moved on: establishing what the code actually does, documenting it, and moving what matters onto a supported platform without breaking the parts nobody remembers writing.
Characterisation tests written against the old system first, capturing the behaviour that carries money or permissions. They are what makes a migration safe, because they fail loudly when the new implementation quietly differs from the one it replaced.
Measured improvement on long-lived applications — query and index work, scheduled jobs, caching where it is safe, and the wasteful round trips that accumulate over a decade. Only worth doing with a measurement taken before and after, which is also how you prove it was worth doing.
Out-of-support dependencies identified and either upgraded or isolated, connection strings and secrets moved out of configuration files, and input handling reviewed on the forms that accept data from outside. Newer code arriving elsewhere does not make the old code safe in the meantime.
Architecture notes, integration contracts, environment and deployment documentation, and a walkthrough for whoever inherits it. On systems like this, documentation is not an appendix to the project — it is how the next change stops being an emergency.
A modernisation plan ordered by what threatens the business and what the business actually needs next, rather than by which module looks easiest to move. The largest module is frequently not the one that should go first.
A concrete list of outputs. If something here is not relevant to your project, it comes out of the scope and the price — we would rather agree that in writing now.
Five steps. You always know which one you are in.
A read-only review of what the system does, what depends on it, where the security and support risk actually sits, and what would break if it stopped. You get this in writing before committing to a build.
Characterisation tests around the behaviour that carries money or permissions, written against the system as it stands. This is the step that makes every later step safe, and the one most often skipped.
The order of work agreed with you: what moves first, what waits, what is deliberately left alone because replacing it would be the wrong use of the budget.
Module by module, new alongside old, with the ability to send traffic back if the new path misbehaves. The old system keeps being maintained throughout rather than being frozen.
Documentation, the test harness, deployment notes and a walkthrough for the team inheriting it. The measure of success is that the next change does not require us.
The platforms and frameworks we build, integrate and maintain on. We would rather work in a stack your team can hire for and hand over than pick whatever is interesting this year — and where an existing platform does the job better than custom code, we will say so.
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