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CS Fundamentals for Software Engineers

Master the computer science concepts software engineering interviews actually test — OOP, DBMS, SQL, Operating Systems, and Computer Networks, with diagrams, Python examples, and real interview drills.

3.8 (37 ratings) Created by Arjun Mehta
Intermediate 82 lessons 28h 19m Updated Jul 2026 English
Preview this course
₹149 ₹299 50% off
incl. GST
left at this price!
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7-day money-back guarantee

What you'll learn

Explain the four pillars of OOP with runnable Python and real interview framing
Reason about databases: keys, normalization, transactions/ACID, indexing, and concurrency
Write interview-grade SQL — joins, GROUP BY/HAVING, subqueries, CTEs, and window functions
Understand operating systems: processes, threads, scheduling, memory, deadlocks, and synchronization
Trace how data moves across networks — OSI/TCP-IP, DNS, HTTP(S), TCP vs UDP, and "what happens when you type google.com"
Answer fundamentals questions the way strong candidates do: definition, example, trade-off, follow-up

This course includes

28h 19m of on-demand content
82 lessons across 7 sections
Access on mobile and desktop
Certificate of completion
Certificate of Achievement
Lifetime access
Curriculum

Course content

7 sections · 82 lessons · 28h 19m

Why OOP Exists 18 min
Classes and Objects 20 min
Attributes and Methods 20 min
Encapsulation 22 min
Abstraction 20 min
Inheritance 22 min
Polymorphism 22 min
Composition vs Inheritance 22 min
Interfaces 22 min
SOLID Principles (Beginner Friendly) 26 min
Common OOP Interview Questions 24 min
OOP Interview Cheat Sheet 18 min
Section Quiz · Object-Oriented Programming (Python) 30 min

Why Databases Exist 16 min
DBMS Architecture 20 min
Relational Databases 20 min
Keys Explained 20 min
Normalization 26 min
Joins Made Easy 24 min
Transactions and ACID 24 min
Indexing 22 min
Concurrency Control 24 min
Database Internals 24 min
SQL vs NoSQL 22 min
DBMS Interview Questions 22 min
Section Quiz · Database Management Systems 30 min

SQL Fundamentals 20 min
Filtering Data 20 min
Sorting and Limiting Results 16 min
Aggregate Functions 20 min
GROUP BY and HAVING 24 min
Joins in SQL 26 min
Subqueries 24 min
Common Table Expressions (CTEs) 24 min
Window Functions 28 min
SQL Interview Problems — Easy 26 min
SQL Interview Problems — Medium 30 min
SQL Interview Problems — Advanced 32 min
Section Quiz · SQL Mastery for Interviews 30 min

Why Operating Systems Exist 16 min
Components of an Operating System 20 min
Processes 20 min
Threads 20 min
CPU Scheduling 26 min
Context Switching 20 min
Memory Management 24 min
Paging and Segmentation 24 min
Deadlocks 24 min
Synchronization 24 min
File Systems 20 min
Operating System Interview Questions 22 min
Section Quiz · Operating Systems 30 min

Why Computer Networks Exist 16 min
Network Basics 20 min
OSI Model 24 min
TCP/IP Model 20 min
DNS Explained 24 min
HTTP and HTTPS 24 min
TCP Deep Dive 24 min
UDP Explained 20 min
Cookies, Sessions, JWT 24 min
Load Balancers and CDNs 24 min
What Happens When You Type Google.com? 28 min
Network Interview Questions 22 min
Section Quiz · Computer Networks 30 min

Most Asked OS Questions 22 min
Most Asked DBMS Questions 22 min
Most Asked SQL Questions 22 min
Most Asked Networking Questions 22 min
Most Asked OOP Questions 22 min
Amazon-style Questions 22 min
Microsoft-style Questions 22 min
Google-style Questions 22 min
Startup Interview Questions 20 min
Mock Interview #1 30 min
Mock Interview #2 30 min
Final Revision Sheet 24 min
Capstone Challenges 30 min
Section Quiz · CS Fundamentals Interview Crash Course 30 min

Final Assessment & Certificate of Achievement

60 questions · 60 min · pass 70% · proctored

This course includes a Certificate of Achievement. Work through every lesson, then pass the timed, proctored final assessment to earn a verifiable certificate you can share on LinkedIn or add to your résumé.

  1. Enroll and complete all lessons
  2. Pass the final assessment (70% to pass)
  3. Earn your Certificate of Achievement

Requirements

  • Comfort with at least one programming language (Python is used for examples)
  • No prior CS degree required — concepts are built up from first principles
  • A willingness to practice out loud and self-test with the section quizzes

Description

What you'll learn

Two candidates sit the same interview. Both can recite that ACID stands for Atomicity, Consistency, Isolation, Durability — but only one can explain why isolation prevents two people from booking the last seat. This course builds the second kind of understanding across the five pillars that product-company interviews actually test: OOP, DBMS, SQL, Operating Systems, and Computer Networks.

How it's taught

Every lesson leads with a concrete example, then the concept, then the trade-off — the same arc that makes a strong interview answer. You'll get hand-drawn-style diagrams, runnable Python and SQL, common-mistake call-outs, and a "Section Knowledge Check" quiz at the end of each module to make the ideas stick.

The crash course & capstone

A final crash-course section ties everything together with the most-asked questions, company-style drills (Amazon, Microsoft, Google, startups), and full mock interviews. The course closes with two open-ended capstone challenges and a timed, certified final assessment — pass it to earn your Certificate of Achievement.

Who this is for

Students and working engineers preparing for software-engineering interviews who want to understand CS fundamentals well enough to reason about them out loud — not just memorize definitions.

Topics covered

interview-prep oop cs-fundamentals databases operating-systems
Your instructor
A

Arjun Mehta

CS Fundamentals & Technical Interview Coach · 12 yrs · Ex-Google, Interview Mentor

3.8 course rating 1 courses

Arjun spent 12 years as a backend and systems engineer — most recently at Google — before turning full-time to coaching. He has helped hundreds of engineers crack the CS-fundamentals rounds that product companies actually run: operating systems, databases, SQL, networks, and OOP. He teaches the "why" behind each concept with diagrams and runnable examples, because that is what separates a strong interview answer from a memorized one.

3.8 course rating · 37 ratings

G
Genesis Lindgren
1 year ago

I learned more here in a week than in months of trying to figure things out on my own. Highly recommended.

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T
Thora Kilback
5 months ago

An okay starting point. Clear enough, just not as comprehensive as I was hoping.

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D
Dr. Kitty Mills DVM
1 month ago

A complete, well-thought-out course. I came in a beginner and finished feeling genuinely confident.

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J
Jess Oberbrunner DVM
1 year ago

Outstanding course. The structure is fantastic and the instructor clearly knows the subject inside and out.

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Frequently asked questions

Yes — once you enroll, the course is yours to revisit forever. New revisions and bonus lessons are added at no extra cost.

Yes — this course includes a Certificate of Achievement. Complete every lesson, then pass the timed, proctored final assessment to earn a shareable, verifiable certificate you can post on LinkedIn or include with job applications.

If the course isn't a fit, request a refund within 7 days of purchase — no questions asked.

Code, slides, and worksheets are downloadable on each lesson page. Videos stream from our CDN so you can watch on any device.

Each course states its level in the hero. If you're comfortable with the prerequisites listed, you're ready to start.

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