it's not clear that either you want to pay the bounty manager or just looking for volunteers.. there are several bounty and campaign managers offering their services you can check them in: https://bitcointalk.org/index.php?board=52.0
as loyce mentioned if you are looking for a BTC paying campaign manager you can hire one of trusted campaign manager from this link: https://bitcointalk.org/index.php?topic=4412712.0