Microlancer.io is a good Bitcoin freelance platform. KYC-free, includes escrow, launched in 2018. Bitejo.com and t.me/BitcoinP2PMarketplace are also options.
NIP-57 may be interesting for Bitcoin marketplaces on Nostr: https://iris.to/post/note16fftkjfzymudl9tahndak0ldxc6mwwt0qfq7z3y63u8y0tt9s40s589rrs