The Heroku add on system allows you to use a number of different tools and services without having to link them all together. The other thing about Heroku is that it takes minutes to basically set up, so now I can just focus 100% of my time on the actual application. It's totally a different calculation when one or two or three people work on something versus a whole group or whole sets of teams, right? "It does feel dirty saying like, yeah, test driven is a monolith," he says.