I know Simmons well! I was an undergrad in Boston, so I knew some people who went there.
Anyway, ideally you could get some more work experience before you apply. Your experience actually sounds good, but keep in mind that you'll be going up against people who ran big projects and led big teams over several years. You don't necessarily need to wait several years and go and lead big teams, but adcomms may look at your app and think it's a little light on experience. They are taking younger, less experienced people than they were a few years ago, but the more you have some full-time experience to point to, the better your chances will be.
Keep in mind that when you apply you'll only have been working for 6 months at most. You probably won't have much to talk about from your full-time job yet in your apps.
If you're confident that your community service work and involvement at school will give you lots of leadership examples to talk about, then go ahead and try applying next year. If not, though, then I recommend waiting a couple of years.
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