That depends on the software development segment. If you are creating 3D games you would expect to build on top of Unity or Unreal because unless you are a major studio building the infrastructure yourself is expensive, slow and not as good. The question is "is computation" such a segment?
Some things that Wolfram Language does that maxima doesn't: machine learning, image processing, audio processing, time series analysis, user interface construction, build-in data, geo computation, natural language processing....
Maxima is just a computer algebra system- one small part of what Wolfram does.