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Tell me what it runs on.
Three questions, then whatever else you want to say. I read every one myself and reply with a straight answer: whether I can help, the approach I would take, roughly what it takes, and what I would do first. No sales call, no deck.
What happens next: I reply by email, usually the same or next working day, with a straight answer. If it is a fit, the first step is a short read of the code and database — a fixed, bounded piece of work that ends in a written specification of what the system does and what the migration would take. You keep that document whatever you decide.