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System Design Interviews for Backend Engineers
Go from a blank whiteboard to a clear, defensible backend design with a repeatable interview process.
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Hi! 👋🏻 Here you'll discover learning paths to reach your full potential.
Never fail a technical interview again.
And, Take your system design skills to the next level!
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20K+Students taught
60K+YouTube subscribers
14+ yearsProfessional experience
7Courses created
Choose your next learning path
Learn deeply, practice deliberately, or start free.
Each path solves a different preparation problem. Pick the one that matches what you need next.
Practice
Interview Question Library
Find your knowledge gaps through focused, topic-by-topic interview practice.
Start practicingComplete course
PostgreSQL High Availability
Connect replication, pooling, partitioning, sharding, failover, and scaling into one practical strategy.
Explore PostgreSQLRecently added resources
Small, focused experiences you can use immediately—before choosing a complete course or practice path.
Free
Senior Backend Roadmap
Map your current gaps and decide what deserves your attention next.
Open roadmapInteractive
Authentication Stack Decision Lab
Seven authentication architecture decisions with immediate feedback.
Start the labSimulator
45-Minute System Design Interview
A Design Uber simulation that reveals where your approach breaks down.
Run the simulationNew
Production RAG Investigation Lab
Investigate a suspicious payment through a production-style evidence funnel.
Open the RAG labHow the material is built
Less memorization. More engineering judgment.
The same three principles shape the courses, interview questions, and free learning resources.
Understand the why
Start from the problem and constraints before introducing a technology or pattern.
Problem → constraints → optionsPractice the decision
Compare alternatives and make the trade-off visible instead of hiding it behind jargon.
Options → trade-off → choiceExplain with confidence
Turn technical understanding into a clear answer you can defend under pressure.
Decision → reason → defenseWhat students say
The result matters more than the rating.
Real comments from students and YouTube viewers—not anonymous marketing quotes.
★★★★★
“The way you explained the theory made it very clear, and the hands-on exercises, though short, were practical and effective.”
K
KerianOriginally published on Udemy
★★★★★
“The way the units are split favors advancing quickly. I am using it to prepare for a work interview.”
FS
Fernando SolarOriginally published on Udemy
★★★★★
“Short and to the point! In just 3 hours a very good, practice-oriented introduction to the most important tools with demonstrations in each section.”
G
GernotOriginally published on Udemy
★★★★★
“This video is very informative, straight to the point and so well done.”
CO
@collinskariuki7089YouTube viewer · REST API DesignView source ↗
★★★★★
“I'm so glad I found your video, Thank you!”
AL
@albertolopez7073YouTube viewer · REST API DesignView source ↗
★★★★★
“This was such a good tutorial for someone like me who is new to these concepts…”
RU
@rupeshchandramohanty416YouTube viewer · Payment System DesignView source ↗
★★★★★
“One of the best videos on YT for Payment System Design.”
KA
@kaushalsoneji26YouTube viewer · Payment System DesignView source ↗
★★★★★
“The things that I haven't learnt in months you taught in minutes.”
BA
@basitashraf1339YouTube viewer · PostgreSQL ReplicationView source ↗
★★★★★
“Amazing! Much better than reading for hours.”
IA
@ianurbina9777YouTube viewer · PostgreSQL ReplicationView source ↗
Your instructor
Hi, I’m Lucian.
I’m a backend engineer and educator with 14+ years of professional experience. I create the explanations and learning paths I wish I had when difficult concepts first appeared in interviews and production systems.
The goal is not to give you more material to collect. It is to help you make better technical decisions—and explain them clearly.
More about Lucian →Free reading
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