You become indispensable by doing things that nobody wants to do. For example, I remember an Engineer I used to work loves writing Perl/awk scripts to go throug

You become indispensable by doing things that nobody wants to do. For example, I remember an Engineer I used to work loves writing Perl/awk scripts to go through tera bytes of data to create reports. The data has anamolies and you need to custom create regular expressions to filter data that you don't need. The last I know he is still there.