I use a script to get an idea of demand in relation to others
w3m -dump https://news.ycombinator.com/item?id=17442187 | tr '[:space:]' '[\n]' | tr '[:upper:]' '[:lower:]' | grep -v "^\s$" | tr -cd '[[:alnum:]]\n' | sort | uniq -c | sort -nbr > july.jobs.2018
You can grep for the fields you are interested to have an idea. This is the data I grabbed on the 2nd around 14:00EST
79 python
71 frontend
63 backend
62 web
54 aws
39 fullstack
35 rails
34 devops
33 ruby
33 mobile
33 docker
32 react native
31 javascript
30 c
27 android
26 linux
25 scale
21 security
21 api
18 nodejs
15 postgresql
14 django
12 node
12 graphql
12 angular
11 golang
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