Have you checked the Services or Services Announcements board to find your bounty manager? Most BM posts their service thread there. Your requirement is quite easy to fulfill by most reputable managers, so you'll have a lot of options. Try Hhampuz, Royse, yahoo, etc.
yet he did not specify exactly what type of bounty plans to run and what type of manager he needed.
Telegram chat moderating is something completely different, and I’m not sure bounty managers do that either, it's more for community managers.
