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The Not-So-Straigh.orward
Road From Microservices
to Serverless
Phil Calçado - @pcalcado - philcalcado.com
What are microservices?
Microservices seem to be
highly-distributed
applica?on architectures.
What is Serverless?
Who knows? !
The Not-So-Straightforward Road From Microservices to Serverless
e.g.
Keep your monolith for as
long as possible
Monolith
Service B
Monolith
Service B
Monolith
Service C
But what if you waited so long
microservices aren’t hype
anymore
there are other alterna?ves?
“Chaps?ck"
The Not-So-Straightforward Road From Microservices to Serverless
This project wasn’t
par?cularly successful
Some challenges we
faced
Solving a bug means re-
processing all the data
“The write path issue”
Write path
Cold start for JVM
Lambdas
DynamoDB Costs
Who owns what? What
calls what? Is this
Lambda supposed to be
in produc?on?
Some of the challenges
we DID NOT face
GeSng new engineers
produc?ve on Lambda/
DynamoDB
Cold start for Node.js
Lambdas
Opera?ons allergy
"Local" development
Developer happiness
How can we keep the good
and get rid of the bad?
User Experience
Database
Back-end
Database
User Experience
Database
Back-end
Point of Sale
Financial Reporting
User ExperienceBack-end
User Manager
User Experience
Database
Back-end
Database
User Experience
Database
Back-end
Point of Sale
Financial Reporting
User ExperienceBack-end
User Manager
User Experience
Database
Database
Database
Service
Service
Service
User Experience
λ
Admin
Web App
User Experience
Database
Database
Database
User Experience
Consumer
Website
Admin
Web App
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
The Not-So-Straightforward Road From Microservices to Serverless
We were suffering from
Pinball machine Architecture
The Not-So-Straightforward Road From Microservices to Serverless
User Experience
Database
Database
Database
User Experience
Consumer
Website
Admin
Web App
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
User Experience
Database
Database
Database
User Experience
Consumer
Website
Admin
Web App
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
 λLambda
API Gateway
API Gateway
API Gateway
Use Serverless as building
blocks for Microservices
AWS Accounts are a great
way to define service
boundaries
API Gateway is actually
quite expensive
(at the moment)
~1/10 of the
engineering teams was
dedicated to pla.orm
But… is this really Serverless?
Who cares? !
You can’t got from 2/10 to
10/10 in one jump.
Serverless looks like the
future, but we’re not
there yet
Ques?ons?

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