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Infrastructure Engineering

Building a Load Balancer from Scratch

4 weeks
0 Learners
eulerfoldeulerfold
Jul 23

“Round-robin, least-connections, and consistent hashing: understanding the layer that sits in front of everything.”

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About this Course

Round-robin, least-connections, and consistent hashing: understanding the layer that sits in front of everything. This Infrastructure Engineering curriculum is designed to give you hands-on experience and deep conceptual understanding. Across 4 intensive modules, you'll tackle real-world challenges and build practical projects that reinforce your learning. By the end of this journey, you'll have the skills and proof of work to demonstrate your expertise.

What you'll learn

Build a basic TCP proxy that accepts connections and forwards them to a backend server.
Implement multiple routing algorithms to distribute traffic across a pool of backend servers.
Implement consistent hashing to route users to the same server while allowing backend pools to scale.
Add active and passive health checking to automatically remove unhealthy backends and monitor load balancer metrics.

Prerequisites

advanced Level

This is a rigorous course requiring prior technical background.

  • Production engineering experience

Ideal for

Backend & Infrastructure Engineers

Infrastructure Engineering Professionals
Tech Enthusiasts
W1

TCP Sockets & Reverse Proxy Basics

Build a basic TCP proxy that accepts connections and forwards them to a backend server.

3 videos•34m
3 readings
3 topics
1 homework
Learn

Topics

1.1
Socket Programming Refresher
8 minutes
1.2
Concurrency in Network Programming
11 minutes
1.3
The Reverse Proxy Architecture
15 minutes

Study Resources

→Build reverse proxy server in Go - DEV Community→go - Make reverse TCP connection accept any amount of ...Code sample→A lightweight dual stack TCP reverse proxy written in go
W2

Load Balancing Algorithms

Implement multiple routing algorithms to distribute traffic across a pool of backend servers.

3 videos•37m
3 readings
3 topics
1 homework
Learn
W3

Consistent Hashing & Sticky Sessions

Implement consistent hashing to route users to the same server while allowing backend pools to scale.

3 videos•36m
2 readings
3 topics
1 homework
Learn
W4

Health Checks, Failover & Observability

Add active and passive health checking to automatically remove unhealthy backends and monitor load balancer metrics.

3 videos•34m
3 readings
3 topics
1 homework
Learn
01

Learn

Watch curated videos and read study resources

02

Practice

Practice what you learned

03

Build Projects

Build projects using your new gained knowledge

04

Submit & Verify

Submit your project and get verified by our system

References

01Build reverse proxy server in Go - DEV Community
02go - Make reverse TCP connection accept any amount of ...Code sample
03A lightweight dual stack TCP reverse proxy written in go
04Load Balancer Algorithms: Round Robin vs Least Connections vs...
05Load Balancing Algorithms: Round Robin, Least Connections, and...
06Load Balancing Algorithms: Round Robin, Least Connections...
07Staff Prep 26: Load Balancing Strategies — L4 vs L7, Health Checks...
08Why Your Load Balancer is Solving a Market Design Problem
09Azure Load Balancer health probes | Microsoft Learn
10Health Checks and Failover: How Systems Detect Failures and Stay Available | by Kalana De Silva | Medium
11How to Build a Load Balancer with Health Checks in Python

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