Step 1

Understanding what is asked in a tech interview

Aptitude

Quantitative Aptitude

Core CS

OS, DBMS, Networks

Core CS

• Paging, thrashing, segmentation
• deadlocks, semaphore
• Cache replacement policies
  
  
• Normalization, ACID Properties
• SQL, NoSQL databases
• Writing nested queries
  
  
• TCP / IP Stack
• Subnets, topologies
• sockets, ports

Data Structures
and Algorithms

DS Algo

• Union Find
• Linked Lists
• Trees, BTree, BST, Tries
• Stacks, Queues
• BFS, DFS
• HashSets, HashMaps
• Arrays
• Strings
• Heaps,
• Priority Queues
• Graphs

• Bit Manipulation
• Binary Search
• Recursion
• Backtracking
• Dynamic Programming
• Graph Algorithms
• Greedy
• Union Find
   
• Two pointer
• Sliding window

Resume Based Questions

Behavioral
Questions

System Design

( Less Common )

Step 2

Preparation

Choosing a programming language

Choosing the right resource for preparation

Websites

• GeeksforGeeks

• Interviewbit

• Interviewcake

• Leetcode
   

• Hackerrank

• Hackerearth

• codechef

• topcoder, codeforces

Books

• DS and Algorithms Made Easy - by Narasimha Karumanchi
• CTCI - Cracking the Coding Interview
• EPI - elements-of-programming-interviews - by adnan aziz
• Java Programming Interviews Exposed
   
• System Design Primer
• https://www.educative.io/courses/grokking-the-system-design-interview

Company Specific Preparation

If you're targeting a specific company, it makes sense to study it's standard set of questions

Interview
Experiences

• DUCS Alumni Interview Experiences

• Interview Experiences on geeksforgeeks

• Interview Experience on Leetcode

Step 3

The Essentials

The art of Resume

• Very Very underrated in DUCS

• A resume is your first impression

• Making a strong resume is an iterative process

• You can tailor resumes to suit specific companies

• Single page resumes are now a standard

• Try to consistent fill the content on the page

• Always use consistent and breathable spacing

• Never use more than 2 fonts and 3 font sizes

• Do not use any colors, pictures, progress bars

• Never ever do a spelling mistake

• Never lie on a resume

• Never over-commit and under deliver

Communication

• Extremely important

• If you can't express your thoughts with clarity, you're probably gonna have a tough time.

• Assess yourself

• Work on your communication skills

• The preferred language is English

Coding Style

• Each language has a certain set of standard coding practices.

• Know them well.

• Use them in your code often

• Know your language well

• Make sure you know nuances of your language

Dev Skills

• There's no substitute for General Knowledge.

• This will give you an edge in all rounds of all companies.

• You'll realize it's important in critical rounds when the stakes are high.