[nerf0]

Took me 2 months of spare time in total. Engine was definitely the hardest. Debugging was also tricky, due to multi-threading.

[nbclark]

Agree. I wrote the engine in Node (so punted on the threading problem a bit) then just ported pieces of the engine to firebase functions to handle the actual computation. Made testing a bit easier as I could just simulate players client side. What did you build yours in?

[nerf0]

Mine is aws lambda + redis. I rely on extensive testing to flush out bugs early. But sometimes I do question my initial choice :D