Do you want to become a successful software developer and dreaming about getting into the big tech companies?
Are you someone who is already working as a developer but looking for a big move in your career?
Well, if you’re one of them then surely you might have tried to do some preparation and you might have tried to cover various topics. You make a plan, you try to follow your plan and you start doing preparation through various resources, tutorials, and videos. You start learning it but after a couple of days or months, you realize that you’re not going anywhere. You’re not making any progress and things are overwhelming for you.
You’re not alone and it’s happening with so many newbie programmers and experienced developers. They try to learn to code, and they try to cover various topics but due to the lack of a good roadmap and guidance, things become messy and confusing for them. During their preparation, they miss out on a lot of important things to cover.
To help you with this we have created a practical roadmap “100 days of code” based on a lot of research and the experience of software developers working in big tech companies. This roadmap will give you a complete guideline to build a strong coding habit and to achieve your goal as a software developer. All you just need is a laptop, a working internet connection, determination to solve problems regularly and within a few months, you can develop the coding habit, learn the essentials, and crack the interviews.
Here, we have covered:
What is 100 Days of Code?
What is the reasonable timeframe to crack the interviews of big tech companies?
This question comes to the mind of every newbie and experienced programmers.
Well, there are a lot of topics and things to cover if you’re targeting some big tech companies. The challenge is the limited timeframe and based on our research we need to say that it may take almost 14 weeks or 100 Days. We have divided the complete topics into 100 days and all you just have to do is to follow it and stay committed to coding for 100 days.
If you follow this approach and stay committed to coding then not only you will develop a good coding habit but also you will be able to crack the interviews of 60-70% of tech companies.
We will cover 5-6 main topics in 100 days, and we will target the interviews of big tech companies such as Facebook, Google, Microsoft, Amazon, etc. These topics are given below…
- Data Structures and Algorithms (Coding part and problem solving)
- System Design
- Operating System and DBMS (database management system)
- Object-Oriented Design
- Cultural Fit
Few things you need to keep in mind before we continue with the roadmap…
- If you’re a beginner then make the target to solve almost 450-500 coding questions.
- If you’re an experienced person then make the target to solve almost 300 to 350 questions.
- System design round is mostly asked from experienced people so beginners have to focus on this section less but experienced one has to focus on this section more.
- If you’re a beginner then try to commit your time for at least 4-6 hours every day.
- If you’re an experienced one then you need to commit for 2-3 hours every day.
- Ideally, you shouldn’t take more than 20–30 minutes to solve any given problem but keep in mind that this rule is not applicable to all the questions.
Prerequisite: We are assuming that if you’re a beginner then you already have completed some projects in your college and if you’re an experienced developer then surely you might be working on some projects.
If you want to learn the DSA completely from the scratch from the expert instructor who themsleve have knowledge of the industry-level technique and concept then you must checkout our offline course DSA for Interview Preparation in different location it is complete beginner to advance course providing you all the necessary skill to crack a high paying job in the tech sector.
Must Read
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How Learning To Code Can Change Your Life?
100 Days of Code For Beginners
Before you go ahead keep in mind that being a newbie programmer you will be overwhelmed with so many questions and you will face a lot of difficulty in solving the problems. It’s okay if you take more time in solving the questions but don’t be discouraged.
Try to solve the problems on your own first even if it takes a couple of more hours. After spending many hours if you don’t get the solution then you can stretch yourself for a few days or take the hints. As you will progress you will see improvement in yourself and also you will take less time in solving the questions.
Day 1 to Day 10
Choose a Programming Language and Learn The Fundamentals of it
You need to choose a programming language and you need to be stick with it. Explore various programming languages, read about them, try it out in your code editor, and check if you’re comfortable with it or not.
A lot of questions will arise when you will be choosing a language. Is Python better than Java? C++ is a faster language, so I should choose this language, Java syntax is more complicated but big companies are working on it, what if I know more than one language?
All these questions will create confusion and you will also switch to some different languages when you will try the languages in your code editor. Explore the languages and pick one which is best for you. Don’t choose a language just because it is very popular in the tech industry. You need to choose a language you’re most comfortable with. Almost it will take 4-5 days in picking up a language.
Once you choose a language learn the fundamentals of it but if you already know the fundamentals (you might have created your project in that language) then brush up on it. It has been seen that a lot of people forget the basic things of their chosen language. So you need to make sure that you have a good command of your chosen language. Learn the basic syntax, give some online tests, and remember the basic things of your chosen language. It may take around one week or 7 days to learn the fundamentals of your language.
Few things you should remember are…
- Reading/Writing from/to files.
- Reading input from the console.
- Split strings
- 2D array implementation and how to use it.
- Very basics things of language such as in C/C++ handling null-terminated strings
A lot of companies such as Lyft and Salesforce have a slight difference in their hiring procedure. They want the candidate to write code and solve the problems on a laptop. You will have to write the complete program and your code should pass the given test cases. You may have to work on command line arguments or you may have to parse the CSV or text files.
Other companies such as Google, Amazon, or Microsoft use a whiteboard. So it’s good that you know the basics of your language to handle both of the coding scenarios in your interview. So almost it will take 10 days to make a decision that which language is best for you and you’re comfortable with.
Resource
You can also try GeeksforGeeks free courses:
Day 11 to Day 20
Learn Data Structures and Algorithms
Now it’s time to learn the most important part of the coding i.e. Data Structures and Algorithms. This subject is mostly taught in undergrad and most people ignore the importance of it. But the topic in this subject is the most important thing to cover in the coding interviews.
Learn the basics of various data structures and algorithms including the complexity part. Topics are given below…
Cover all the above fundamentals and implement various DSA in your code editor. You also need to cover the String part which is most likely asked in the interviews.
If you’re thinking that you already know all the topics in DSA then just give some online tests and test your skill. You will surely find that you still need to revise the basic concepts.
Learn to implement array, linked list, stack, queue, tree, etc. The basic foundation helps a lot in solving the coding question so do not skip it and have a good grasp on it.
Resource
Looking to learn Data Structures and Algorithms from the basics to the advanced level? Then you’ve come to the right platform! Learn Data Structures and Algorithms with the GFG DSA Self-Paced Course where you will learn and master all the important concepts of data structures and algorithms like sorting, strings, searching, trees, and more to prepare for interviews of top IT giants like Microsoft, Amazon, Adobe, etc.
Day 21 to Day 40
Solve Basic Level Problems
Once you get familiar with the basic data structure and algorithm practice for the basic coding questions. Practicing basic level questions will help you in stretching your mind and it will prepare you to tackle medium level problems.
Do not skip the basic level otherwise, you will face difficulty in solving harder problems and you will have to go back to the basic level again. Try to solve almost 200 basic level questions within 10 days. Depending on the time and speed you can increase the number of questions. Almost 8-12 questions a day within the timeframe of 4-6 hours will help you in building a good foundation.
Sample Array Problems
Sample Linked List Problems
Sample Stack and Queue Problems
Sample Tree Problems
Sample Graph Problems
Sample Heap Problems
Day 41 to Day 60
Solve Medium Level Problems
Now it’s time to practice for some medium level questions. Medium level problems will prepare you to solve harder problems and these questions are most likely asked in the interviews. Try to solve almost 150-170 medium level questions within 20 days. Depending on the time and speed you can increase the number of questions. Almost 7-8 questions a day within the timeframe of 4-6 hours are good enough.
Sample Array Problems
Sample Linked List Problems
Sample Stack and Queue Problems
Sample Tree Problems
Sample Graph Problems
Day 61 to Day 75
Solve Hard Level Problems
Once you solved the basic and medium level question, move to the hard problems which are the last ones. Try to solve almost 80-90 hard level questions within 15 days. Depending on the time and speed you can increase the number of questions.
Sample Problems
Best Resource for Solving Coding Questions: GeeksforGeeks Practice Portal
Day 76 to Day 85
System Design
For beginners, this section is not much important but sometimes interviewers asked system design-related questions to the non-experienced candidates as well. So it’s good to know about the system design part as well. Firstly learn the basic concept of system design such as Load Balancing, Caching, Proxies, CAP Theorem, Consistency, Sharding or data partitioning, etc.
If you wish to learn system design in depth then you check our course – Mastering System Design
You will be asked to design a web-scale service. So once you’re done with basic concepts, prepare yourself for some most likely system design round questions such as…
- URL Shortening Service (TinyURL)
- Design Facebook Newsfeed
- Design Uber or Lyft
Preparing these questions will help you in handling this round and you will get to know what exactly you have to do in this round. You will be taking ownership of this round and you will describe the different components of the system.
Interviewers check that if the candidate is able to build a large and complex system or not. As we have mentioned this round is mostly not asked from the beginners so you don’t need to go into too much depth of this section. However, you should have the knowledge that what exactly happens in this round so in case if it is asked in the interview, you can handle it.
Must Go Through:
Day 86 to Day 92
OS and DBMS
Now it’s time to study the two most important computer science subjects, operating systems, and database management systems. Most of the time junior engineers struggle with the OS and DBMS related questions and skip this part. But preparing these two subjects are also important for the interviews.
Go through the basics concepts of operating system such as
- Process and Process Management
- Thread and Concurrency
- Multithreading
- Lock
- Process Scheduling
- Synchronization and Deadlock
- CPU Scheduling
- Distributed file system
- Memory management
- Critical section problem
Also, prepare yourself with some database-related questions such as relational and non-relational databases, sharding, scaling, ACID property, indexing, etc.
Resources
Day 93 to Day 99
Object-Oriented Design
Prepare yourself for an object-oriented design question for 7 days. You should have a good understanding of software design patterns, SOLID/DRY principles, and various oops concepts. Some object-oriented design questions are given below…
- Design an ATM
- Design Vending Machine
- Design a Parking Lot
- Design a Movie Ticket Booking System
Your main goal is to gather all the requirements and transform that into comprehensible classes. You need to identify different objects and entities from a problem statement.
In interviews, you will have to explain different components and their interface. Also, you will be explaining how different components are interacting with each other using the interfaces. Prepare yourself with a use case diagram, activity diagram, and class diagram.
Day 100
Cultural Fit
Last day prepare yourself for the cultural round. Companies do not hire toxic people and also they don’t hire candidates who are not passionate about the product. Understand the culture of the company. For example, in Amazon culture is deeply rooted, and they conduct the bar raiser round. They care a lot about the leadership principle.
In interviews, you will have to show interest in the product and you will have to be honest. Fake people won’t be entertained. So make sure that you keep in mind all these things and you prepare yourself with the right attitude.
Take your interview preparation to the next level, with this Complete Interview Preparation Course. This interview-centric course is designed to prepare you for the role of SDE for both product and service-based companies. A placement preparation pack built with years of expertise at the most affordable prices. Here, you’ll begin with the basics and move on to advanced concepts of programming languages, concepts about OOPs, DSA from basic to advanced, OOAD Concepts, and other important CS subjects like OS, CN, DBMS, etc, along with building quality projects to ace the interview, aptitude & reasoning, and resume building strategies!
100 Days of Code For Experienced
Before you go ahead keep in mind that you need to focus on many things. You’re expected to perform well in the coding round, system design round and in the other rounds as well. You have the advantage to use the knowledge you have learned in your day-to-day job.
Sometimes it’s not the years of experience that matters for the interviewer but the time you spend sharpening your coding or technical skill matters for them. So it’s not good to judge your skills on the basis of years of experience. Track your knowledge, give some online tests, and check how far you still have to go.
Day 1 to Day 7
Choose a Programming Language and Learn The Fundamentals of it
Being an experienced developer it will be easy for you to choose a programming language and learn the fundamentals of it. You can try out a new language or you can choose a language you’re using in your day-to-day job. Once you make the decision go through all the basic concepts.
Don’t think that you don’t need to go through the basics just because you’re using your language in your day-to-day job. Many times developers forget the basic concepts, or they miss out on a few things. So don’t skip this part and have a good command of your chosen language.
Few things you should remember are…
- Reading/Writing from/to files.
- Reading input from the console.
- Split strings
- 2D array implementation and how to use it.
- Very basics things of language such as in C/C++ handling null-terminated strings
A lot of companies such as Lyft and Salesforce have a slight difference in their hiring procedure. They want the candidate to write code and solve the problems on a laptop. You will have to write the complete program and your code should pass the given test cases. You may have to work on command line arguments or you may have to parse the CSV or text files.
Other companies such as Google, Amazon, or Microsoft use a whiteboard. So it’s good that you know the basics of your language to handle both of the coding scenarios in your interview. Almost it will take 7 days to cover this part.
Resource
You can also try GeeksforGeeks free courses:
Day 8 to Day 14
Learn Data Structures and Algorithms
The experienced developer already uses data structures and algorithms in their days to day jobs (example: array is most widely used in various applications). They use their coding logic with different data structures, and various algorithms deepening on the requirements.
Still, a lot of them forget the basic implementation, and they can not perform simple tasks. So it is better not to skip this part and jump directly into the coding.
Go through all the fundamentals of data structures such as an array, linked list, queue, stack, tree, etc, and its implementation. Brush up on the basic operations performed on these data structures. Clear all the concepts of complexity, learn about the different algorithms, and their implementation.
The basic foundation of coding i.e concepts of DSA must be strong to solve the different levels of coding questions. You can check your basic skill by giving some online tests.
Resource
Day 15 to Day 28
Solve Basic Level Problems
Once you brush up on the data structure and algorithms, practice for the basic level coding questions. With experienced developers, most of the time basic level questions are not asked in the interviews round. Even if it is then it’s just a kind of warm-up problem. During the phone interview, you can encounter these kinds of problems. So do not ignore this part and solve the basic questions first before you move to the complex one.
Give 14 days to basic level questions and try to solve almost 70-80 questions. Depending on the time and speed you can increase the number of questions. Almost 5-6 questions a day within the timeframe of 2-3 hours is good enough to prepare you for the phone interviews, warm-up kind of problems, and for building a basic foundation as well.
Sample Array Problems
Sample Linked List Problems
Sample Stack and Queue Problems
Sample Tree Problems
Sample Graph Problems
Sample Heap problems
Day 29 to Day 49
Solve Medium Level Problems
After practicing the basic level coding questions move to the medium level questions and start solving it. Medium level problems will prepare you to solve harder problems and these questions are most likely asked in the interviews. Try will have to solve almost 120-130 medium level questions within 21 days. Depending on the time and speed you can increase the number of questions. Almost 5-6 questions a day within the timeframe of 2-3 hours is good to solve.
Sample Linked List Problems
Sample Stack and Queue Problems
Sample Tree Problems
Sample Graph Problems
Day 50 to Day 70
Solve Hard Level Problems
Once you solved the basic and medium level question, move to the complex or hard level problems, and solve it. Give it 21 days and try to solve almost 100-110 questions. Depending on the time and speed you can increase the number of questions.
Sample Problems
Best Resource for Solving Coding Questions: GeeksforGeeks Practice Portal
Day 71 to Day 85
System Design
This section is more important for experienced developers to focus on. System design is the most important rounds in interviews specially for senior engineers. Experienced developers need to focus on this part more and in interviews, they will have to tell the approach to the interviewer to design a highly scalable system.
Firstly learn all the basic concepts of system design such as Load Balancing, Caching, Proxies, CAP Theorem, Consistency, Sharding or data partitioning, etc. Once you’re done with basic concepts, prepare yourself for some most likely system design round questions such as…
- URL shortening service (TinyURL)
- Design Facebook Newsfeed
- Design Netflix/Youtube
- Design Uber or Lyft
Preparing these questions will help you in handling this round and you will get to know what exactly you have to do in this round. You will be taking ownership of this round and you will describe the different components of the system. In this round, interviewers check that if the candidate is able to build a large and complex system or not.
After preparing around 5-6 questions you will have an idea that how this round looks like, what exactly you’re supposed to do and how you need to handle it.
Must Read:
Day 86 to Day 92
OS and DBMS
Now it’s time to study the two most important computer science subjects, operating systems, and database management systems. Senior engineers are supposed to perform well when the concepts of these two subjects are asked in the interviews because they would be taking the help of multiple cores and threads while writing the code in their daily job.
In the operating system brush up on some basic concepts which you left a long time back during your undergrad program…
- Process and Process management
- Thread and Concurrency
- Multithreading
- Lock
- Process Scheduling
- Synchronization and Deadlock
- CPU Scheduling
- Distributed file system
- Memory management
- Critical section problem
Also, prepare yourself with some database-related questions such as relational and non-relational databases, sharding, scaling, ACID property, indexing, etc.
Resources
Day 93 to Day 99
Object-Oriented Design
Prepare yourself for an object-oriented design question for 7 days. You should have a good understanding of software design patterns, SOLID/DRY principles, and various oops concepts. Some object-oriented design questions are given below…
- Design an ATM
- Design Vending Machine
- Design a Parking Lot
- Design a Movie Ticket Booking System
Your main goal is to gather all the requirements and transform that into comprehensible classes. You need to identify different objects and entities from a problem statement.
In interviews, you will have to explain different components and their interface. Also, you will be explaining how different components are interacting with each other using the interfaces. Prepare yourself with a use case diagram, activity diagram, and class diagram.
Day 100
Cultural Fit
Last day prepare yourself for the cultural round. Companies do not hire toxic people and also they don’t hire candidates who are not passionate about the product. Understand the culture of the company. For example, in Amazon culture is deeply rooted, and they conduct the bar raiser round. They care a lot about the leadership principle.
In interviews, you will have to show interest in the product and you will have to be honest. Fake people won’t be entertained. So make sure that you keep in mind all these things and you prepare yourself with the right attitude.
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