I have experience with multi-threaded applications.
I paticipated as core developer in next products:
1. HandyBackup backup solution
2. Global Scape secure SFTP server v2.0
3. Well know Navitel Navigator (cross platform core)
I developed from scratch
1. high performance multi threaded module for MetaTrader Server
2. multi threaded push API library for well known game developer Alawar Inc.
This is part of my experience
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I'll re-bid with lower value after you clarify your need.
If all you need is just code review and consulting, then we will fit in $40.
PS I don't recommend you to hire cheap developer, if your code has commercial aspects.
Once you meet situation, when your software goes more and more failures. At this moment you will have a lot of customers that will count on you.
However, if I'm wrong and your application is amateur, then hire cheapest and save money.