Nautronic makes scoreboards for sports halls and arenas. The control software was embedded C written over many years by [people who had moved on]. Every new sport, display or feature was slow and risky to add, and few developers could work on it at all.
What we shipped
The scoreboard control logic ported from embedded C to C# on .NET, behaviour preserved [verified how: side-by-side runs, test suite].
[Sports / display types covered].
[Operator UI or hardware interface, if part of the job].
What it changed
[Outcome with a number: time to add a new sport before and after, installations running the new code.]