Our team conducted these things upfront so that the product can scale and meet the future needs.
Everything was API-based for system interoperability and integration with 3rd party systems like Facebook, Twitter, Zapier and autoresponders like mailchimp, mailerlite etc.
Utilized scalable cloud infrastructure to make sure that the system can scale up and down based on the traffic demands.
Used most proven UI libraries to ensure marketers get the flexibility they need to create beautiful forms which works well on all devices.
Employed proactive fraud detection mechanism that alerts the system and users.
Deployed a scalable and configurable web server with on-the-fly security configurations for advanced marketers.