
What will be best architecture/tech stack for designing a notification microservice that will send push notification, in app notification accoross mobile or web... this service may use by multiple service...may 100s of users
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We are team of 3-4 people currently working on it that's why

A full blown notification system is not a small project, without the scope it will be difficult to tell what to do what not to, for ios and android its easy now, google and apple ecosystem takes care of delivering the notifications all you need is to integrate, web notifications is a different thing all together, depending on what the requirements is it can be a simple pull on page refresh, http long poll or fancy Websockets implementation with some pub/sub behind it
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If you work at a small startup don't build it, many free open source software would be there. Search for them, never re-invent the wheel until you actually end up in performance/throughout issues which at a small startup would not be the case
You can write a wrapper around open source softwares