Slides from Wojtek Gawroński's talk at 4Developers 2018 in Katowice about how serverless approach can help you maximize delivered business value, how API mashup enables you to create an MVP as soon as possible, without cutting edges and ignoring maintainability aspects.

1. Serverless .NET on AWS
4Developers Katowice (06.11.2018)

2. ~ # whoami (afronski)
✓ Co-founder and Functional Aficionado
at Pattern Match
Erlang, Elixir, F#, Node.js, C#
AWS (3 certificates)
✓ Co-organizer of Functional Miners

3. What?

5. There are
servers

7. There are
ops

8. read.acloud.guru/iaas-paas-serverless-the-next-big-deal-in-cloud-computing

9. Serverless
Back-end as a Service
(BaaS)
Function as a Service
(FaaS)

10. Incoming Event
Source Code Package Configuration
Function (Execution Unit)
RAM: 512 MB
RAM: 512 MB
0.5 GB
Real time: 120 ms
Bill time: 200 ms (buckets by 100 ms)
Price: 0.00001667 GB * seconds
Cost: 0.00001667 * 0.5 GB * 0.2 s =
0.000001667 USD =
1.7 μUSD
Response

11. Why?

12. www.doc.ic.ac.uk/~rbc/papers/fse-serverless-17.pdf
Gojko Adzic - Designing for the Serverless Age (GOTO 2017)

13. Problem

14. Automated System for
On-Call Number Rotation

15. Friday, 4:09 PM …

16. Alerts from
Monitoring
Alarm Escalation
PagerDuty
Always calling the
same phone number
📱☎📞
Twilio
Bought phone number
receives a call
and do redirection *
On-Call Operator
Operators

17. In response to
a call to Twilio
number ...
Redirecting Incident Call
Application
Asks PagerDuty via
API about current
on-call engineer
Twilio
Redirects from
virtual phone number to
our on-call engineer

18. It’s free! *
* If you are paying for PagerDuty anyway
* And you need to pay once for Twilio numbers
* AWS costs are below 1 USD - they fit in free tier too!

20. Technology

21. ✓ Amazon Cognito
✓ Amazon S3 (Simple Storage Service)
✓ Amazon API Gateway
✓ Amazon Lambda
✓ Amazon CloudWatch
✓ AWS X-Ray
✓ Twilio
✓ PagerDuty
Services

22. It lets you add user sign-up/sign-in
and access control to your web
and mobile applications in quick
and easy way.
BaaS
Amazon Cognito

23. It is an object storage built to store
and retrieve any amount of
data from anywhere.
SaaS
Amazon S3 (Simple Storage Service)

24. It is a fully managed service that
makes it easy for developers to
create, publish, maintain, monitor,
and secure APIs at any scale.
BaaS
Amazon API Gateway

25. It lets you run code without provisioning
or managing servers. You are paying
only when your code is running.
SaaS
Amazon Lambda

26. It is a monitoring and logs management
service for AWS resources, but also
for the applications and workloads
you run there.
SaaS
Amazon CloudWatch

27. It helps developers analyze and debug
distributed applications, including
serverless or microservices
architectures.
SaaS
AWS X-Ray

28. Cloud communications platform for building
SMS, Voice and Messaging applications on top
of an API built for global scale.
SaaS
Twilio

29. Digital Operations Management Platform -
alerting, incidents management and on-call
rotation schedules management.
SaaS
PagerDuty

30. Let’s build it!

31. Summary

32. 1. Serverless is different than our usual work.
2. Context is king (especially business one).
a. It does not apply everywhere.
b. It allows you to create a valuable solution quickly.
i. It is your job to reassess it again afterwards!
3. Serverless is much more than just Function as a Service.
4. It is a tradeoff.
a. Example: you exchange flexibility/freedom for
smaller operational complexity.
Summary

33. Thank you!
Questions?

34. References
1. Our company - Pattern Match and my talks.
2. Functional Miners meet-up (facebook, twitter, github, email, website).
3. Serverless Architecture, Serverless (Martin Fowler’s articles).
4. AWS Lambda, Google Cloud Functions, Azure Functions.
5. Should I use AWS Lambda or EC2?
6. Cold Start: Container Reuse in AWS Lambda, Serverless: Cold Start War.
7. Serverless Computing: Economic and Architectural Impact.
8. Optimizing Enterprise Economics with Serverless.
9. Running Executables in AWS Lambda.
10. Droplr Serverless Revolution.
11. AWS Lambda support for .NET Core 2.0.
12. AWS X-Ray service and serverless-plugin-tracing.
13. Repository with source code.