Looking for someone mastery at " node.js "

we are working in new project based at android aplication and server " dashboard " who manage the app . to know in the server side we can get all information about users : status "online ,offline" , user contry , operator network .... at now we find many problem from the server side come be very slow even if we are woking with just 1000 users active. the server msut be able to menage more than 200k users without problem. so we would like to find good devlopper mastery at node.js to optimize that requestion make it from server side . skills : android, node . js. realtime sync , server manager .

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