Freelancer marketplaces tend to be targeted at non-technical people hiring freelancers. Instead, I want to be able to see who has used specific tools I'll need

Freelancer marketplaces tend to be targeted at non-technical people hiring freelancers. Instead, I want to be able to see who has used specific tools I'll need and how they've used them. Otechie indexes freelancers on Github based off of the contents of their public repos manifest files (currently only package.json). Besides other languages, I plan to add the ability to search for developers who have used services such as Circleci, Heroku, or Docker.