This document discusses serverless applications and functions as a service (FaaS). It defines serverless as code that runs in ephemeral containers that are fully managed by third parties. FaaS allows developers to write event-triggered backend logic without managing servers. Examples are given of AWS Lambda and building a tic-tac-toe game using Lambda and other AWS services. Pricing models for the major FaaS providers are also presented. Finally, a sample serverless architecture diagram is shown.

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Serverless Applications
Reduce your costs, improve your architecture
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• Two different but overlapping areas:
▪ Backend as a Service (BaaS)
▪ Function as a Service (FaaS)
What is Serverless?
Serverless

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Backend as a Service
Serverless
Authorization Server
Content Server

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• Server-side logic written by the application developer
• Run in stateless compute containers
• Event-triggered
• Ephemeral (one or more invocation)
• Fully managed by a 3rd party
Functions as a Service
Serverless

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Functions as a Service: Example
Serverless
https://aws.amazon.com/lambda/

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Functions as a Service: Example
Serverless
https://aws.amazon.com/lambda/

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Demo
Serverless
API
Gateway
Create game
List games
Get game
Play
DynamoDB

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https://github.com/weber-gregoire/tic-tac-toe-serverless-demo

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Language and Framework agnostic
Serverless

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FaaS pricing
Serverless
AWS Lambda Google Functions Azure Functions
Requests $0.20 / million requests $0.40 / million requests $0.20 / million requests
Duration $0.00001667 / GB-second
$0.0000025 / GB-second
$0.0000100 / GHz-second
$0.000016 / GB-second
Free Tier
1 million requests / month
400,000 GB-s / month
2 million requests / month
400,000 GB-s / month
200,000 GHz-s / month
1 million requests / month
400,000 GB-s / month

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Serverless Architecture
Serverless
API Gateway
Purchase Function
Search Function
Client
(Browser)
Authorization Service
(Auth0)
Product Database
(Firebase)
Purchase Database
(Fauna)

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