Has anyone used this custom wordpress web design agency?

Hi all, I'm finally moving forward with a complex e-commerce project and need a custom build, not just a template tweak. Someone suggested a company that calls itself a custom wordpress web design agency.

Before I reach out, I'm hoping someone here has firsthand experience with an agency specializing in custom WordPress development. Specifically, I need to know about their ability to handle complex integrations and unique backend functionality. Any genuine recommendations for a custom agency that delivers quality work (and stays on budget!) would be greatly appreciated. Thanks!