That is the work of a software engineer.

To build upon this, we need to keep in mind that at least in some jurisdictions the role of a certified engineer is only required in projects with relevant size, and the responsibility of that engineer is to ensure the project complies with all requirements and therefore be held responsible for any mishap. This means that it's perfectly fine if non-engineers work independently on complex tasks, provided that an engineer attests that their output is fine and takes responsibility in case it isn't and it causes problems.