As someone with a Bachelors degree in (Pure) Mathematics from a state university, I'll comfortably say that it hasn't caused any problems for me in my 10+ full stack/data engineer career, and I've never gotten any impression that a Masters would've made things better.

Compiler work might be different, but I'd suspect not.

As for networking opportunities... Not really. You'll be networking with people with 0 years in professional dev work, mostly in a academia. They aren't contacts that will benefit you.

You say you have a lot of coworkers with masters, are they from other countries? A pattern I have noticed while working in a company with a lot of H1B hires is that people will do undergrad in their country, then come to America on an education visa and get their masters degree while looking for a job here as a next step. If you are working somewhere where that is common that might be why you have many coworkers with masters.

I personally don't think it is worth it. You have 4 years of experience. That's going to be plenty to get your foot in the door. Your college experience matters less the further in your career you are.

I'm not saying don't get a masters, I'm just saying I don't think it is the necessary step you think it is. If you're interested in furthering your education it may still be worthwhile, but not solely for your career.

In my experience as someone with 0 degrees, 15ish years of exp, and having been on both sides of the hiring process:

1. Degrees don't really matter for hiring in tech, in fact personally I think X years working a real job in your chosen field (as long as you put some effort in to improving) is a lot more valuable than X years at even the best college.
2. Everyone has imposter syndrome. It's not just you, and having more degrees doesn't make it go away!

As a dev with 15 years experience with a bachelors and a masters that I quit halfway through - no one has even mentioned my schooling for the past 12 years or so.

Well, if you factor in tuition fees, cost of living and opportunity costs (reduced income because you'll likely wont work fulltime anymore), do you expect to get a job afterwards - that you could not get with your current qualifications - that will pay off those costs? You've got a degree in mathematics, so you'll do the calculation...

Do you know that scene from Good Will Hunting where Ben Afflecks' character says to the snobby student who tries to waive with the prestige of his school: "you dropped 150 grand on a fuckin' education you could have got for a dollar fifty in late charges at the public library"?

If you want to grow your skills you can do it three orders of magnitude cheaper than with a degree program by studying from books or taking dedicated courses and seminars. Consider if you want to go down a path where the credentials are really a requirement or just a nice entry in your resume.

It's worth it if there's something specific you want to work on.

A Masters' Degree (and PhD) is almost the only opportunity to work on certain things like distributed systems, P2P systems, federated networks (like this), consensus under Byzantine conditions, cryptography, operating systems and programming languages development, etc.

So I'd only do it if you have something in mind that you'd like to work and somewhere that you'd like to do it.

I posted yesterday describing my masters degree (in software engineering) experience as a "10/10," "would do again 👍," "totally worth it!" After sleeping on that thought, I have to say that it really depends.

It was a ton of time and work. You will be trading out time for hobbies/family for 2 years. A lot of time. It will be expensive if you're paying out of pocket. Also, it doesn't guarantee anything about your success. As you can see in other comments, some hiring managers have "never looked at education level when hiring." (...Why would you not even consider someone's education when deciding who you'd advance out of a pile of strangers asking for an interview?)

However, I did enjoy the experience. I had actual "fun" with my classmates throughout the program. Just a few months before graduation, I got two job offers from the only two companies that I applied to. My masters degree came up in every 👏 single👏 interview 👏.

It's not something you must have to be successful, but if you have the time and money, and you want to do it, you should absolutely do it. It does make your resume stand out at the end of the day which can help get you an interview.

I don't even have a bachelors degree, and certainly no masters and I'm doing just fine. I worked at a FAANG company for a few years as well, and the lack of a degree was a complete non-issue during the hiring process. All they cared about was my experience and how well I did in the screening and interview. My view on this is obviously biased due to my personal experience, but I think that if you're a good self-learner that 2 years of building stuff will get you a lot more value than 2 years in a masters degree unless you're going for a very specific field that requires one.