&gt; Java takes longer to build with and it&#x27;s harder for startups that are working on product market fit.<p>Longer or harder than using Golang? Unlikely.<p>Golang has some advantages over Java like a simpler deployment model, less runtime overhead, etc but overall for a fairly standard web application it makes much more sense to pick Java over Golang.<p>&gt; but before then it&#x27;s premature optimisation in my book.<p>Then so is using Golang. You have answered your own original question :). Keep using Ruby.