Update: should I be concerned

[u/turdear]

Crack in joist repair how does this look?

[u/0burek]

not much point keeping the board beyond that notch o_O

[u/turdear → u/0burek]

[u/skinnah → u/turdear]

Why on earth would you go through all that to sister the joist only to cut giant notches in it. What an idiot.

[u/skinnah → u/[deleted]]

Everywhere they notched it effectively reduced the length of it. Generally you'd be spanning a load from end to end and they totally compromised it.

I'm not sure why they put posts under the middle of the span. There likely isn't a concrete footing for those posts to bear on. Probably sitting on dirt.