Gusto's integration with Human Interest (401k) is pretty crap too. Keeps marking the money in the wrong classification. Good job my accountant found it. Been working for months trying to get it corrected. Gusto can't even follow the thread and each contact I have to start over.
I actually lead the payroll integrations team at a competitor of Human Interest, and we just finished building out a Gusto integration using the Gusto API.
You've tried reaching out to Human Interest, right? Your 401(k) provider should have direct access to Gusto engineers, but most likely, it's a problem on HI's side.
Yup, but Gusto provides a payroll API, which the benefits provider (in this case, HI) is responsible for using in order to accurately set payroll deductions (and other data) at Gusto for particular employees.
Maybe someone who works at HI will see this and chime in—but HI should be able to fix this.