30CS Core 30 Join on WhatsApp
CS Core 30 · New batch starts first week of November

Crack the CS fundamentals round in 30 days.

Operating Systems, Computer Networks, DBMS and OOP in Python. Taught from zero, explained in Telugu, built around the questions interviewers actually ask.

Join on WhatsApp See the syllabus
Harsha Vardhan Penugonda
SRE at Morgan Stanley · Taught at NxtWave and IIT Mandi with Masai School
30 daysOne topic every day
4 subjectsOS · CN · DBMS · OOP
TeluguBasics zero nunchi
DailyMaterial and slides
Why this bootcamp

Coding gets you shortlisted. Fundamentals get you selected.

Most students prepare only coding questions. Then the interviewer asks about a deadlock, a database index or what happens when you type a URL, and the answer doesn't come.

Interviews test the core

Technical rounds for freshers regularly include OS, Networks, DBMS and OOP questions, alongside coding.

College taught it for marks

Most of us memorised these subjects for exams. Interviews need you to explain them clearly, in your own words.

Understand it, in Telugu

Every concept explained in Telugu with real examples, so it makes sense once and stays with you.

Syllabus

Four subjects, covered end to end

Each subject runs for a week, from the basics to the questions you'll face in interviews.

Operating Systems

Days 1–7

How a computer runs many programs at once, and keeps them from breaking each other.

  • What an OS does: kernel, system calls, user and kernel mode
  • Processes, process states, PCB and context switching
  • Threads and multithreading, process vs thread
  • CPU scheduling: FCFS, SJF, Round Robin, Priority
  • Synchronization: race conditions, critical section, mutex, semaphores
  • Deadlocks: conditions, prevention, avoidance (Banker's), detection
  • Memory: paging, segmentation, virtual memory, page replacement

Computer Networks

Days 8–14

How data actually travels from your laptop to a server and back.

  • OSI and TCP/IP models, layer by layer
  • IP addressing, subnetting, IPv4 vs IPv6, MAC and ARP
  • TCP vs UDP, the 3-way handshake, ports
  • DNS, DHCP, HTTP and HTTPS, status codes
  • Routers, switches, NAT and routing basics
  • Security basics: TLS, firewalls, common attacks
  • What happens when you type a URL, end to end

DBMS and SQL

Days 15–21

How data is stored, queried and kept correct, with hands-on SQL.

  • DBMS vs file systems, ER model, keys
  • SQL basics: DDL, DML, SELECT, WHERE, ORDER BY
  • Joins, GROUP BY, HAVING and subqueries
  • Normalization: 1NF, 2NF, 3NF, BCNF
  • Transactions, ACID, concurrency and isolation levels
  • Indexing and B+ trees, query performance
  • SQL vs NoSQL, and the most-asked SQL queries

OOP in Python

Days 22–28

How to design clean programs with objects, the way interviewers expect.

  • Classes and objects, __init__, self, attributes and methods
  • Encapsulation and properties
  • Inheritance: single, multiple, and Python's MRO
  • Polymorphism: overriding, duck typing, dunder methods
  • Abstraction with abstract base classes
  • Exceptions, composition vs inheritance, SOLID basics
  • Design questions: parking lot, library system
Your 30-day plan

What you'll learn, day by day

One focused topic a day, with the material and slides shared after every class.

Interviews

What companies ask, and where we cover it

These are the topics freshers most often report from technical interviews. Every one of them is part of the bootcamp.

Service companies and mass recruiters

Technical and HR rounds after the online test.

TCSInfosysWiproAccentureCognizantCapgeminiHCLTechTech Mahindra
OOP

Four pillars of OOP, overloading vs overriding, class vs object.

Covered: Days 22–26
DBMS

Primary vs foreign key, normalization, basic SQL queries.

Covered: Days 15–18
OS

Process vs thread, what an OS does, scheduling basics.

Covered: Days 1–4
Networks

OSI layers, TCP vs UDP, what an IP address is.

Covered: Days 8–10

Product companies

Deeper questions, often mixed into the coding rounds.

AmazonMicrosoftGoogleAdobeOracleSalesforceAtlassian
OS

Deadlocks, synchronization, paging and virtual memory.

Covered: Days 5–7
DBMS

Indexing, transactions and ACID, isolation levels.

Covered: Days 19–20
Networks

What happens when you type a URL, DNS, HTTPS.

Covered: Days 11–14
OOP

Design a system with classes, SOLID principles.

Covered: Days 27–28

Startups and product-based Indian companies

Practical questions tied to how real systems work.

ZohoFlipkartPhonePePaytmSwiggyFreshworks
SQL

Joins, GROUP BY, second-highest salary style queries.

Covered: Days 16–17, 21
OOP

Class design, inheritance vs composition.

Covered: Days 24–28
Networks

HTTP methods and status codes, DNS, caching.

Covered: Days 11, 14
OS

Threads, concurrency, memory basics.

Covered: Days 3, 5, 7

Topics are based on commonly reported fresher interview experiences and vary by role, year and interviewer. Company names belong to their respective owners. This bootcamp is independent and not affiliated with or endorsed by any company listed.

What you get

Everything you need, every day

Daily class

One focused topic a day, explained from zero.

Detailed material

Notes for every topic, to revise before interviews.

Slides of the day

The class slides, shared after every session.

Interview focus

Each topic ends with the questions you're likely to face.

Your journey

From "I'm not sure" to interview-ready

  1. 0

    Message on WhatsApp

    Tap Join on WhatsApp. I'll reply with the payment details, class timings and anything you want to ask.

  2. 1

    Week 1: Operating Systems

    Processes, threads, scheduling, deadlocks and memory. The subject most students fear becomes the one they explain best.

  3. 2

    Week 2: Computer Networks

    From OSI layers to what happens when you type a URL. You'll be able to trace a request end to end.

  4. 3

    Week 3: DBMS and SQL

    Keys, normalization, transactions, indexing, and writing the SQL queries interviewers ask.

  5. 4

    Week 4: OOP in Python

    The four pillars, clean class design, and simple system design questions.

  6. 30

    Revision and mock interview practice

    Rapid revision of the most-asked questions, then practice answering them the way you would in a real interview.

Who it's for

Built for anyone preparing for placements

Tech students

B.Tech, MCA and other CS or IT students who want to strengthen the core subjects.

Non-tech students

Students from other branches moving into tech. We start from zero, so no background is needed.

Campus and off-campus

Final-year students, recent graduates and job seekers preparing for either route.

Your mentor

Harsha Vardhan Penugonda

Site Reliability Engineer at Morgan Stanley

I work on production systems every day, where operating systems, networks and databases are not exam topics but the job itself. I also interview freshers, and the same gaps come up again and again: good coders who go blank on the fundamentals.

This bootcamp is my answer to that. Everything is explained in Telugu, with real examples, so you understand it once and can explain it confidently in your interview.

SRE, Morgan Stanley Taught at NxtWave Taught at IIT Mandi with Masai School
FAQ

Questions students ask

Do I need any prior knowledge?

No. Every subject starts from zero. If you can use a computer, you can follow along.

I'm from a non-tech branch. Can I join?

Yes. The bootcamp is designed for both tech and non-tech students preparing for placements.

What language are the classes in?

Concepts are explained in Telugu. Technical terms stay in English, the way they're used in interviews.

Which programming language is used for OOP?

Python.

What material will I get?

Detailed material for every topic and the slides from each day's class.

When does the batch start, and what are the timings?

The batch starts in the first week of November 2026. Exact dates and class timings are shared on WhatsApp when you join.

What is the fee?

₹1,299. If you join by 23 October, the early-bird fee is ₹899.

How do I pay?

Message me on WhatsApp using the Join button. I'll send the payment details and confirm your seat there.

Ready to get your fundamentals interview-ready?

30 days. Four subjects. Fully explained in Telugu.

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Early-bird ₹899 until 23 October · ₹1,299 after
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