Thanks for the interest, I might publish the thing after auditing and documenting. There are hard-coded insensitive credentials like Cognito pool ID and player UUIDs, which I should make nicely configurable. If I do it soon enough I’ll reply here. It’s very basic-looking though (and without dynamic registration, intended for small infrequently changing groups with memberships managed by an admin).
As I have already been using AWS and this was not at all business-critical, I did not care about vendor lock-in and thought of it as an exercise in how much I could delegate (neither letting random visitors access our dashboard, nor spending time implementing custom auth). Their JS SDK documentation wasn’t great, but after some digging it was somewhat straightforward to make a fully static SPA (hosted on S3) access specified AWS resources (per IAM policy) on behalf of authenticated Cognito user.
The app also “integrates” with Discord to ping a channel on each instance start/stop, but that is merely posting to a webhook URL.
I wrote it in React and TypeScript with a bare-minimal Babel + Webpack configuration but it could just as well be written in vanilla JS.
As to the server, it is plain Ubuntu with a cron job that periodically tries to launch MC server if it’s not already running (or something silly like that). Another cron job publishes stats to DynamoDB (IAM policy allowing the instance access the table), and I wanted to add yet another job to generate a PNG with a pretty map of the spawn.