I use Lighthouse and Dareboost as a minimum, and a suite of site specific integration tests that run on Browserstack if it's anything important. I do all my development using eslint and flowtype where appropriate, and I write unit tests for the Javascript logic (usually in Jest as I do React these days). I also use Sonarqube to check the code. I've been tinkering with Stylelint to check and format my SCSS code.
Even with all that in place the QA/QC guy always seems to find problems.
Even with all that in place the QA/QC guy always seems to find problems.