Business Guy and Techie Girl might be a little TOO informal, even in casual settings, but I think you were on the right track there. You might want to try some

Business Guy and Techie Girl might be a little TOO informal, even in casual settings, but I think you were on the right track there. You might want to try something like: Dick - Runs Operations, Sales and Business Development. Jane - Responsible for software, technology and server farms. If either of you have some past experience to draw on, maybe add that in too: Dick - Formerly performed similar duties for BigCo. Jane - Previously scaled operations for WebCo.