SendGrid is a platform for transactional and marketing emails.

The client requested the following:

• Implement Marketing campaign application - used to send marketing campaigns to lists that could have tens of millions of recipients

• Integrate SendGrid services with different resellers: (eg. Google, Microsoft Azure, Heroku, etc)

• Work closely with the billing team to implement different billing workflows

• Create other microservices like:

  •  permissions service that it was called by most of the existing services to see if the user/API key  has permission to do an action

  • a microservice to consume Google pubsub events that were triggered when a Sendgrid upgrade/downgrade/cancel account event was triggered from Google marketplace.

  • microservice that was processing high-volume events sent by Sendgrid webhook and then stored them in a data warehouse