That was nostr:npub1ssjaq3spxe6j5vhh0cc3g44wj75fvp8d3j44nwk7dapzg9t4rm4savvhr4 who had the nostrbounties.com website. Its no longer up, but the project was made open source (MIT License) last year with source available at github.com/diamsa/nostrbounties

The bounties I post now are either to project github issues or to individuals.