Thread by @dermayank

"3 Months Coding Interview Preparation Guide"

I work at Dell & many developers ask me how should they too prepare for “Big Tech” companies.

So, I created a roadmap of topics frequently asked in software engineering Interviews

🧵A Thread🧵

#100DaysOfCode

3 Months interview preparation schedule

Week 0: Programming language
Week 1, 2 & 3: Data Structures
Week 4, 5 & 6: Algorithms
Week 7 & 8: System Design
Week 9 : Operating System
Week 10: Object-Oriented Design
Week 11: Behavioral question
Week 12: Revision.

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Programming language -

The best programming language for your coding interviews is the language that you’re most comfortable with. Prefer - Java or CPP or Python or javascript

Brush up all the concepts of the programming language of your choice.

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Data Structures -

Start by revising Computer Science Data Structures concepts.

1. Complexity Analysis (a.k.a BigO)
2. Arrays
3. Stacks
4. Queues
5. Linked List
6. Trees
7. Tries
8. Graphs (BFS and DFS)
9. Hash Tables
10. Heaps

#100DaysOfCode

Data Structures -

Start by revising Computer Science Data Structures concepts.

1. Complexity Analysis (a.k.a BigO)
2. Arrays
3. Stacks
4. Queues
5. Linked List
6. Trees
7. Tries
8. Graphs (BFS and DFS)
9. Hash Tables
10. Heaps

#100DaysOfCode

Searching Algorithms for an interview-

1. Linear Search
2. Binary Search
3. Jump Search

Sorting Algorithms for an interview -

1. Selection Sort
2. Bubble Sort
3. Insertion Sort
4. Merge Sort
5. Quick Sort
6. Heap Sort
7. Counting Sort

#100DaysOfCode

System Design -

System Design Basic Concepts

1. Network Protocol
2. Horizontal & Vertical Scaling
3. Cache
4. Load Balancers
5. Content Delivery Network (CDN)
6. Reverse Proxy
7. Message Queue
8. Consistent Hashing
9. Database Sharding

#100DaysOfCode

System Design -

Large System Architecture

1. Design Url Shortening Service (ex – bitly)
2. Design Pastebin Architecture
3. Desing Rate Limiter
4. Parking Lot System
5. WhatsApp
6. Uber design 
7. Instagram 
8. Tinder Service

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Operating Systems -

1. Threads
2. Locks
3. Synchronization
4. TLB
5. Interrupt vs System Call
6. Kernel
7. Round Robin Algorithm
8. Threads
9. Concurrency
10. Paging
11. Page Replacement Algorithms
12. Interrupts
13. Scheduling

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Object-Oriented Design -

1. Class & Objects
2. Polymorphism
3. Abstraction
4. Inheritance
5. Encapsulation
6. Practice Questions -
a. Design an ATM.
b. Design an elevator.
c. Design a Parking System.

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Cultural fit (Behavioral) interview question -

1. Tell me a little about yourself?
2. Why do you want to work for this company?
3. What are your greatest strengths & weakness?
4. What motivates you?
5. What are your salary expectations?

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Resources to follow for Coding interview Preparation -

1. geeksforgeeks.org
2. codechef.com
3. hackerrank.com
4. leetcode.com
5. nlogn.in (my personal favorite)

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