I was running Crucible on t2.micro + MySQL RDS db.t2.micro till Dec 2016 without any problems.
Also I tried JIRA on the same config (probably it was t1.micro at this time) about 1.5 year ago but it was just for fun/prove of concept. I believe it was version 6.4.* and it was a bit slow but worked without any problems.
Update: Existing client asked to launch additional experimental 10-users tier JIRA and hosting was up to me. So I tried t2.micro + Postgres RDS db.t2.micro and it works no problem. Page rendering performance is smooth and I do not see any problems. Only thing is that I had to cofigure swap on the ec2 instance. Without it JIRA died once due to memory peak.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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