Through most of my web development experience (I've built desktop apps for windows too - Visual Basic back in the day) I have worked with PHP, JS, HTML CSS. In recent years I have also worked with node.js and Ruby. Current projects I am involved with utilise PHP, Ruby, and JS.
Working in teams:
I have worked solo and as part of teams large and small. Everything from building my own frameworks from scratch and using them for freelance work; to planning and architecting a large project, hiring my own team, running the project as a lead developer; and working in teams responsible for smaller parts of very large websites. In recent years I have been in larger companies, and have responsibility for a number of smaller projects which I work on mostly solo.
How to make sure everything works?
Continuously (manually) testing my work whilst in development, being sure to test all areas that the changed code affects. I'm usually fairly confident that a refactored function will work before I run it (I kind of run code in my head - others do this too, surely?) and usually I find the main reason it doesn't is simply typos. Admittedly the languages I work with allow for very quick changes and re-tests (i.e. no compilation)
Using CI:
Yes, at the last few jobs I have had we use CI. Everything is tested again (manually) in a staging environment before going live (a number of people test at this point, and only when all are happy is it pushed to production). I should point out that this is only the projects I have been involved with. Other projects within the organisations have had automated testing, but not all
Testing taking a considerable amount of time:
During my development, I would say no, but again as I pointed out - I work with technologies that lend themselves well to a fast change/test process. As for others testing at the staging environment - they are essentially just checking from an end user point of view making sure all functionality is working. I couldn't speak for them as to whether testing slows them down.
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Technologies I work with:
Working in teams:
How to make sure everything works?
Using CI:
Testing taking a considerable amount of time: