A website that can do this
a) super admin can setup subdomain for different clients
b) admin (my clients) can setup product info and upload product serial number
c) people who buy products from my clients, can register themselves on this website, and register their product for warranty purpose
d) end user (customer of clients) register their products
e) end user be reminded of product warranty period
f) customer support (part of my client) can check product warranty period. (e.g. after 3 months, if there is issue with the product that the end customer purchased, they can go to the shop to ask for exchange. Customer support will check web site to make sure the user's product is under warranty).
Need to use LAMP.
a) super admin will add subdomain : Will it be admin specific or end user specific ?
Client specific. IF the website is called warranty.com, and ff customer's company name is tekthing, then there will be a subdomain tekthing.warranty.com
b) admin can add various products, but serial number is different for each product, so I think it will be the end user who will add serial number ? or is the admin a seller who adds serial number while selling the product to the end user ?
Admin, who is the client, will upload a list of serial numbers. So, when his customers go in to register a product, enters a serial number, it will be checked again the serial numbers on the website (hidden).
c) when end user register their product do they need to submit proofs or is it simple registration meant for user's own reference ?
Yes, they have to upload photocopy/scanned copies of receipts.
f) how does customer support fit in ? is this the customer support from the product manufacturer we are talking about ? or is it the customer support being provided by the super admin ?
If the company TekThing is the client, they'll have their own service centre. End customers who bought products from them will come to the service centre, bring the product, and the customer support there will check that the product has valid serial number and valid warranty period.
Customer support can check this from the website.
How much scalability ie how many estimated users in next 6-12 months ? How many features in pipeline that will need to be added in the future ?
You have to propose website design.
Website must be modern, easy to use and responsive.
Website will be hosted in Singapore's server.