The document provides an introduction to backend engineering. It discusses what backend engineering includes such as web networking, system design, databases, operating systems, and cloud. It covers REST APIs, HTTP/HTTPS, JSON, databases, programming languages, MVC, ports, and cloud computing. The document is meant to give an overview of the key concepts in backend engineering.

1. Introduction to Backend Engineering

2. What is Backend Engineering

3. What does it Include ?
● Web and how it works
● Networking( and protocols )
● System Design
● Databases
● Operating System ( to some extend )
● Cloud ( somewhat )

4. How Big it is ?

5. How to Get Started
REST API dev :: That’s It
If you want to get fancy or solve real time problems : GraphQL &
WebSockets
If you want to become god : gRPC

6. What is REST API
Stands for : REepresentational State Transfer
API : Application Programming Interface
In simple terms :
- You send a Request
- You get a Response
It is stateless, that means once you send a request and after a server
responding to you, no one remembers anything !!

8. https://dev.to/dev117uday/uri-url-urn-20n9

9. What is HTTP and HTTPS
Stands for HyperText Transfer Protocol (HTTP) and Secure
Versions of HTTP :
● HTTP 1/1.1
● HTTP 2
● HTTP 3
It is a spec : https://tools.ietf.org/html/rfc2616

10. Lets find google.com and ping it
nslookup google.com

11. JSON vs Others...

12. Show Postman code

13. Who here remembers OSI model ?
Open Systems Interconnection Model

16. What is WebSockets
WebSocket is a bidirectional communication protocol that can send the
data from the client to the server or from the server to the client

18. Lets talk about programming backend …….
https://www.techempower.com/benchmarks/

19. JavaScript Backend Frameworks

20. C# Backend Framework

21. Python Backend Frameworks

22. Java Backend Framework

23. Model - View - Controller

24. What are PORTS ?
Network
Interface
Todo App web
server
Home
inventory web
server
Network
Request
:5000
:3000
Lets take a look at PORTs
lsof -i -P

25. PORTS
● HTTP by defaults hits PORT 80
● HTTPS by defaults hits PORT 443
​Ports are specified by a number ranging from 1 to 65535.
- 0-1023 – are “Well Known Ports” associated with services considered as critical or
essential. System Ports
- 1024-49151 – are Registered Ports or User Ports and as the name indicates, can
be reserved by sending a request to the Internet Assigned Numbers Authority
(IANA).
- 49152-65535 – are called Dynamic Ports and are suggested for private use. They
also referred to as the Private Ports.

26. What are Databases ?

27. What are Databases
A database is an organized collection of data, generally stored and accessed
electronically from a computer system.
Example of SQL
select * from employee limit 5

28. Types of Database Paradigms

29. Key Value Databases
Redis
Memcache

30. Wide Column Databases

31. Document Databases

32. RDBMS

33. Graph Databases

34. Search Engines

35. Multi Model Databases

36. Quick Demo of RDMS Database

37. What else we have in Backend Engineering ?
● Authentication
● Message Brokers/Queues
● Pub/Sub
● Notifications Services
● Object Storage, CDN
● Microservices
And much more that i couldn’t mention

38. What is Cloud Computing ?
What is DevOps ?

39. Thank You !!
https://www.youtube.com/watch?v=98B6P_QAh68
https://www.youtube.com/watch?v=783ccP__No8