GDPR Compliance Review for SaaS Product Launch

We're launching a B2B software platform in the UK next quarter and need to ensure our data handling practices meet GDPR requirements. We've drafted our privacy policy and data processing agreements, but we're uncertain about consent mechanisms, international data transfers, and our obligations as a controller. We also need guidance on implementing privacy by design principles into our product architecture. Our team has basic compliance knowledge but we need expert legal review before we go live. We'd like someone to audit our documentation, flag gaps, and provide clear recommendations we can action quickly.