Use Google Cloud Armor as a WAF layer along with Apigee. Use Cloud CDN for caching and reCAPTCHA Enterprise for user authentication.

About the Author: Sai Saran Vaidyanathan is a Technical Solutions Consultant at Apigee, where he helps customers build digital experiences using API management solutions across public cloud platforms such as Google Cloud Platform (GCP), Microsoft Azure, Amazon Web Services (AWS), and IBM Bluemix
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