Serverless Culture
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- QuizNext is a gamified learning app for CBSE and ICSE students from grades 6-10 with over 100k users and 10 million server calls per month. - It uses a serverless architecture on AWS with AWS Lambda, Amazon API Gateway, Amazon DynamoDB, Amazon S3, AWS AppSync, Amazon Cognito, and other services. - This allows the app to scale easily and cost-effectively to support thousands of users with zero downtime and incremental deployments without capacity planning or log cleaning.
Serverless Culture
- 3. • Chose Framework • Define Principles • Develop • Deploy – CI/CD - ELB - Capacity Planning…
- 7. Guruprasad Holla Founder, Quiznext Head of Engineering @Vidyanext Principle Architect @Harman, @ADITI 15+Years building solutions for ISVs, B2B and B2C
- 8. QuizNext- 3x Practice App for CBSE&ICSE • Gamified learning app • Supports real time 1:1 challenges, Delivers Quizzes, Live completions for CBSE/ICSE 6-10 • Backed completely by serverless • ~100K users • 10M+ Server calls
- 9. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena
- 10. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena • Amplify client for GraphQL • Two API end points • Content Access • Quiz Service - user data, performance, points, challenges etc • Subscriptions for live challenges and leader board updates • In app notifications • GraphQL - Offline access to data AWS AppSync
- 11. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena • User authentication • Phone number validation • OTP Verification(SNS) Amazon Cognito
- 12. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena • User data, Challenges data, recommendations and some content meta data • Most of direct CRUD operations are driven by Appsync – dynamo db templates • Some data access is routed through lambda functions Amazon DynamoDB
- 13. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena • Question Content storage • Question Templates, Live quiz questions • Dynamo DB archived elements • App Images AWS S3
- 14. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena • Triggered from appsync • Event driven cleanup jobs • ranking jobs • test creation jobs etc • Recommendation generations • SQS based auto respond jobs • In memory cache AWS Lambda
- 15. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena
- 16. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena
- 17. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena
- 18. QuizNext Architecture (AWS) AWS Cloud AWS Lambda Amazon CloudWatch Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint Amazon Simple Notification Service Amazon Simple Queue Service Amazon Athena
- 19. QuizNext Architecture AWS Cloud AWS Lambda Cloud Watch Events Amazon Cognito AWS S3 GraphQL AWS AppSync Amazon DynamoDB Amazon Pinpoint SNS SQS Amazon Athena Amazon EC2
- 20. How did we land here?
- 21. Webhooks for CRM • HA Service for sales reversal • Not too simple, not too complex • Unpredictable load • Internal CRM Users • Stateless Amazon API Gateway AWS Lambda
- 22. Payment Receiver Webhook • HA Service • Used only during end of the month • High traceability and logging • Independent DB • CRM Integration Amazon API Gateway AWS Lambda Amazon DynamoDB
- 23. Today at QuizNext < 100$/Month to support 20K active users AppSync 10M server calls a month for 20$ 0 downtime Incremental deployments No peak time panics No log cleaning, disc overrun etc 3 environments automated by cloud formation All configurations are backed on Git
- 24. What did we learn?
- 26. “Change the way we look at services”
- 27. FaaS Function 1 Function 2 Function 3 Function 4 Function 5 + BaaS
- 28. Think about scale on day 1 • Is your implementation scalable? • Can code run multi instance? • Will your code timeout? • DynamoDB Scan vs Query • Indexes, Composite keys • Host affinity?
- 29. Think about atomicity • Triggers are not evil • Resources as packages • Explore SQS, S3, Cloudwatch etc Update Score Calculate Rank Update Score Trigger Ranker Calculate Rank
- 30. Think of micro jobs • Explore triggers • Can we delay this? • Can we clean it up later? • Aggregation, rollups etc • Look for timeouts Update Score Calculate Rank
- 31. MVP at architecture level • Know your extension options • Throwing hardware/resource is easy and cheaper • Cost of redesign is smaller Resolver Templates
- 32. Think about cost • Understand how you are billed • Its complicated - so tag resources • Use cost explorer and breakdown costing data • Set min capacity for dev/test environment
- 33. Think about UX • Are you writing critical data? • When do you need confirmations • What can be delay executed Update Score Calculate Rank Update Score Trigger Ranker Calculate Rank
- 34. Be script ready Everything is programmable • Migrations are easy • You can modify resources • You can modify configs Do not overengineer • You can do it later Explore tooling
- 35. Questions?
- 37. Thank you g p r a s a d h o l l a Guruprasad Holla #serverless #aws #gamification #edtech