We built Workflows for developers and see it as an alternative to writing cron jobs from scratch. While you can definitely write some code in Zapier, Workflows focuses on putting SQL and JS front and center when you need it, GUI when you don't.
If you give Workflows a try, I'd love to hear your feedback (jamie@retool.com)
We're also working on NPM module support (so you can pull in any SDK) right now.