Ask HN: What are effective ways to apply for coding jobs with a STEM degree?

For example, I'm currently a Chemist and I've learnt a decent amount of C++, Python and SQL, certainly enough to apply my knowledge. I have a few projects under my belt in C++ and Python, and an application that improved my current workplace's efficiency.

There seems to be very few Junior Developer Jobs in Ontario, Canada... Currently I'm trying to email/PM people involved at the places I'm applying. Is this enough?

Has anyone else gone through this process, and are there ways to improve this kind of job search?