[dankohn1]

We're not nearly at Stripe's scale, but my startup (Spreemo) has achieved pretty amazing parallelism using the commercial SaaS CircleCI. We have 3907 expects across 372 RSpec and Cucumber files. Our tests complete in ~14 minutes when run across 8 containers.

One of the great strengths for CircleCI is that they auto-discover our test types, calculate how long each file takes to run, and then auto-allocate the files in future runs to try to equalize the run times across containers. The only effort we had to do was split up our slowest test file when we found that it was taking longer to complete than a combination of files on the other machines.

I also like that I can run pronto https://github.com/mmozuras/pronto to post Rubocop, Rails Best Practices, and Brakeman errors as comments on Github.

[andreasklinger]

i like pronto's approach

we simply added the linters/code analysis to the CI itself

reasoning: we try to have as little as possible "code style" discussion in PRs