Am in the process of ramping up a similar-sized board. If you are worried about IP leakage, it's best to take more of the project on yourself. If you're US-bas

Am in the process of ramping up a similar-sized board. If you are worried about IP leakage, it's best to take more of the project on yourself. If you're US-based, there are a number of boutique PCB manufacturers you can call on stateside. Fast iteration is key; even next day airing stuff from China can sometimes double the iteration period when you consider customs. Don't try to deal with China yourself if you have no experience. There are numerous agents who know the shortcuts, and I wish I could recommend some. There's nothing more irritating than realizing you picked the wrong shipping company or freight forwarder and thousands of dollars' worth of product getting delayed 3 months or lost entirely because, say, you thought FedEx was as good there as they are here. There are more than a few horror stories where "account managers" on the Chinese side lulled their customers into a sense of turnkey operation, then pilfered the SWIFT or IBAN transfers once the order volume got huge, lying to both manufacturer and client, disappearing scot free into the Chinese system only when they determined the jig was up and they couldn't defraud their client, you, out of more money. If you're at all technically capable, recommend you consider getting the bare boards made in China but doing your own pick and place and reflow in your own business (costs about $5k in capital equipment). That way only you know what you're building, and you can exert way more control over the unexpected changes that are inevitably coming.