I was changing a switch in my house when I found a number of connections in the electrical box that were soldered rather than secured with a wire nut. The solder joints look very well done, the conductors were twisted together nicely and the solder itself was nicely done. It was not some oxidized amateur mess. These joints were then wrapped in electrical tape.

Is that something that need to be concerned about? Would it count as being up to code on an inspection?

I am in rural Minnesota, outside city limits, in an un-incorporated township. I do see several inspection stickers on the breaker boxes in the house, so something was inspected at one point.