Sure! Here goes:
The App itself is boring old rails, with postgres (get me started on how much I like postgres and I will literally bore you to tears.) The original views were all haml and sass delivered via the asset pipeline. I sprinkled in angular here or there as the application grew.
Today, I'm slowly tearing away the angular. I've moved to webpack for JavaScript, and React for all new UIs. I've been really enjoying both the speed of development, and how solid everything feels.
Over time, I'm writing less and less ActiveRecord, and more and more sequel… still learning, but getting better.
The app is run on Heroku, and its been A++ would recommend to everyone.
The Calibre agent is node and websockets talking to Chrome®, theres other bits of ruby, and even some golang now.
I use terraform and ansible (although, the ansible may as well have been bash scripts) through a buildkite (https://buildkite.com — the best fucking CI service on the planet) pipeline. AMIs are built, shipped to different regions, then based on some config are rolled out.
Papertrail for logs - omg, logging! Essential. I run thousands of tests per day (I don't know this number off the top of my head, but its a lot)… and the nature of the internet is THERE IS ALWAYS FAILURE. Having logging at my fingertips has always made my job building Calibre easier. I think I pay $20 per month right now, and its the most important thing I pay for.
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Ok. Whew. Could probably keep going, but I'm not sure how much you wanna know. Happy to answer specific things though!
I do everything. No contractors. Although @fox has been recently helping me with my writing (her native language is Polish, and she writes waayyy better than me - and most others).