MaNI and Rits (Rijks brother) are full time devs for Gulden. The PoW2 and SegSig already had over 40 000 lines of code added when they talked about it on slack and others talked about it on here.

Part time dev would take 3-5 years to do a update this big. The whitepaper for PoW2 only came last year and then the project every hates called SegSig was added in August which delayed PoW2 by already 6 months.