Two ways, both of which reach me. Email is the faster one.
The platform, its four components, the scale it runs at, and four problems worked end to end — each found by measuring rather than guessing.
The systems currently running, what each one does, and where you can go and look at it yourself rather than taking my word for it.
Roles, dates and employment history live on LinkedIn rather than here — this site argues from the work itself, which is the part that can be checked.