You can request that custom code is reviewed or certified by SilverStripe. This page on code review and warranty explains what this provides.
To request this, complete the Request Code Review or Code Warranty form inside the Service Desk. You will need to specify a link to the location (URL) where this code is stored on the shared code repository. SilverStripe will get in touch explaining the costs and process, before proceeding.
The cost shall be a one-off fee proportional to the volume and complexity of the code in question.