Amazon SNS vs iZooto

• The AWS Lambda SNS trigger is great. Subscribing multiple Lambda functions to an SNS topic is a nice way to decouple features.
• SNS is fully-managed. Our team is too small to manage our own pub/sub infrastructure.
• Subscribing email endpoints to SNS topics and integrating topics with CloudWatch alerts is very easy; we create more non-emergency notifications than we would without SNS.

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• iZooto allows us to keep up to date with various browser developments & push notification standards that keep evolving.
• iZooto allows us to re-target users who viewed a particular product, or products in a certain price range or users from a certain location or all all of these together.
• iZooto allows us to monetise our push notifications without any extra effort.

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• The SNS Console has not been updated in a long time, and it was confusing to begin with.
• Testing systems that use SNS end-to-end can be tricky; LocalStack somewhat ameliorates this problem.
• Debugging is difficult.

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• There are times when iZooto's dashboard had issues on Safari browser.

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• The ability to trigger AWS Lambda functions when messages are published to topics is a great pattern. It allows us to build features that are inexpensive to run and maintain.
• Our developers are more likely to create notifications for non-emergency alerts because SNS makes it so easy to send emails for CloudWatch alarms. This helps us to be mindful of problems that may require attention but are not worth waking anyone up at night.
• Some teammates have experimented with SNS for push notifications; they were disappointed by the lack of features and difficulty in debugging.

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• iZooto gives us a good % of our overall traffic by bringing a lot of returning users.
• iZooto contributes a healthy chunk of our ad revenues.

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