I am not a developer, I did study it at university but I ended up more in the IT support line of business before getting more involved in digital media. In terms of software development I have played around a bit with creating my own WordPress theme and I understand MySQL/PHP and LAMP in genera but I am rusty now. I occasionally have to produce websites for work so I just take an existing WP theme and heavily modify the CSS to make look how I want.
My main area of expertise would be accessibility, I know quite a bit about that and I am continuously learning. I have reached the stage in my 40's though that I don't think I will ever properly get into software development now. Modern multi stack workflows are just getting a bit too complicated, in my day it was Notepad (actually I would have used a proper IDE of some sort), PHP, HTML, CSS, and SQL. I would do everything from scratch (probably badly!) and also learnt C#.NET when it was brand new but haven't touched that for decades. The main issue with modern development is you have to learn the languages, then the libraries, and stuff like GIT etc. The last 'proper' programming I did was programming the Arduino as I used to make a lot of electronics projects during lockdown.
I would quite like to get into the user interface design and accessibility testing side of things though.