Tic-tac-toe for Slack

What it does

I found an interesting solution for the problem of not having tic-tac-toe in Slack with the use of Slack Buttons. The app is https://serverless.com/ and almost stateless running on AWS Lambda which costs me about $0.30AUD/month to support over 600 hard working Slack teams. Someone told me that Slack internship candidates are asked to make tic-tac-toe. 😂

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