Building reliable background jobs and engineering workflows has almost always been challenging in any company I worked for, and I’m glad there is a company now who tries to excel the DX aspect of this problem.
I was in a similar situation as you except I have a full-time job. I started https://cronhub.io a year ago and it's currently a profitable side-business.
You don't need to focus on the idea too much. I think it's important but seeing other companies solving the same problem should not discourage you to come up with your own solution.
Take a look at these products for inspiration (https://www.indiehackers.com/products) and some of them solve a similar problem but they still co-exist.
I've been facing the same problem so I've decided to make it my next side-project and build the simplest way to keep track of books online. Here is the link: http://www.booknshelf.com/
Currently I'm listening to "Personal MBA" audiobook and loving it so far. I'm not the biggest fan of business books but decided to give this one a try to learn a bit more about marketing and sales.
I've been using Amazon Product API for Booknshelf (www.booknshelf.com) by passing "category => book" in the search to query only on Amazon Books. The book search by title is quite relevant. I thought this might be useful!
The way how I usually choose my next read is by recommendations. It maybe a friend or someone I really admire. I could go over their reading list, check out the book reviews, ask my friends and pick the book.
I'm also working on my own project called Booknshelf which helps people to discover great books on different topics. It's still in an early stage but I'm excited to push it forward. It was featured on "Show HN" yesterday but here is the link https://booknshelf.com/.
A website to help people discover great books and bookshelves on different topics. It's also a place to keep track of your books, creating shelves and staying organized with your readings!