Your First Tech Interview
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Your First Tech Interview

The Questions and Unique Formula to get the Job you want

About the Book

Master the unique formula that will make you succeed in the tech interview process! Get your portfolio ready and prepare with the Questions & Answers included in the book.

Discover the strategy and techniques to progress through the interview process with confidence, build your online presence and personal projects which will become your key selling points during the interview rounds. 

Learn how to deal with the technical on site interview adding value to the team interviewing you.

What’s inside the book ? 

  • A behind the scene look at the whole tech hiring process.
  • A practical guide to ace every step of the way.
  • Questions with Answers for practice and preparation.
  • Technical interview questions and answers pdf
  • Bonus: Free Exclusive Javascript PDF Books.

This book is not only for job seekers, it’s also great for non technical recruiters and hiring managers looking for a go to guide with Questions and Answers for their interview.

Check out other books from the author:


Javascript Challenges

Programming in Golang

SysAdmin Interview Questions

Python and Django Web Developer

Frontend Developer Interview Questions

Data Structures and Algorithms for Job Interviews


What are the technical questions asked in interview ?

Some of the questions asked during technical interviews in 2021 are:

  • What are your technical certifications?
  • How did your education prepare you for this job?
  • What do you do to maintain your technical certifications?
  • How would you rate your key competencies for this job?
  • What are your IT strengths and weaknesses?

How can I pass my technical interview?

Some tips on how to pass a technical interview are:

  1. Preparing in advanced a 30-second to 1-minute elevator pitch for the “tell me about yourself” question.
  2. Before you go, study up on the most important fundamentals related to the position.
  3. Pick one programming language and know it really well.
  4. Do regular coding challenges/smart practice online.
  5. Understand tech fundamentals.

Are technical interviews hard?

Some Technical interviews might be tough. Interviewers aren't just looking for programmers, they are often looking for independent thinkers who can take ownership of projects and work.

How long does a technical interview last?

Technical Interviews in 2021 usually last between 45 minutes to one hour, much like first-round, in-person interviews. They could occur anytime during the hiring process. In this time, the interviewer will likely test your technical skills.

Are coding interviews hard ?

Coding interviews are hard, because they test not the smartness or skills, but flexibility, stress-resistance and ability to iterate approaches fast, instead of sticking to single method or waiting for your brain to process the info.

What makes a good technical interview?

A good technical interview should create a positive experience for both the interviewer and the candidate. So the best sign the interview is going great is when the interviewer presents several challenges and takes a good time to discuss the way you approached the situation giving you time to explain in more detail about your proposed solution.

What questions are asked in coding interview?

Some of the questions and challenges during a tech coding interview in 2021 might include:

  • Write code to check a String is palindrome or not.
  • Write a method which will remove any given character from a String.
  • Print all permutation of String both iterative and Recursive way.
  • Write a function to find out longest palindrome in a given string.

How do I prepare for a coding interview?

Ideas and tips to prepare for a coding interview:

  • Build the hard skills. Get in the habit of regularly doing code challenges.
  • Don't forget the soft skills.
  • Acknowledge multiple solutions.
  • Study your algorithms and data structures.

When should I start studying for coding interviews?

in general, at least 4–6 weeks, for 2–3 hours a day, and this assumes you are an experienced Engineer with a strong background in Computer Science. Move the time slider out according to your experience level.

After reading this technical interview questions and answer pdf book you will be ready to start cracking the coding interview in 2021.

About the Author

Alejandro Garcia
A.J. García

I started my coding career back in 2003. Lately I've been involved a lot in Javascript for frontend and the backend.

I would love passing along to you some of the experiences and challenges I've faced over the years.

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Table of Contents

  • Introduction
    • Who is this book for ?
    • What this book covers ?
  • Chapter 1: Always ready for success in the job market
    • Writing the engaging resume that lands your first interview
    • Engineering a winning tech portfolio
  • Chapter 2: The real story behind the interview process
    • A powerful conversation that moves you into the second interview
  • Chapter 3: The meeting that will change your life
  • Chapter 4: The interview never ends
  • Chapter 5: HTML Questions
    • What is ARIA and when should you use it?
    • What is the minimum recommended ratio of contrast between foreground text and background to comply with WCAG? Why does this matter?
    • What are some of the tools available to test the accessibility of a website or web application?
    • What is the Accessibility Tree?
    • What is the purpose of the alt attribute on images?
    • What are defer and async attributes on a <script> tag?
    • What is the purpose of cache busting and how can you achieve it?
    • What is the DOM?
    • Describe your thoughts on how a single page web app should handle focus when changing routes
    • Can a web page contain multiple <header> elements? What about <footer> elements?
    • Discuss the differences between an HTML specification and a browser’s implementation thereof.
    • What are some differences that XHTML has compared to HTML?
    • Briefly describe the correct usage of the following HTML5 semantic elements: <header>, <article>,<section>, <footer>
    • What is HTML5 Web Storage? Explain localStorage and sessionStorage.
    • What are landmark roles and how can they be useful?
    • Where and why is the rel="noopener" attribute used?
    • What is WCAG? What are the differences between A, AA, and AAA compliance?
  • Chapter 6: CSS Questions
    • What is CSS BEM?
    • Describe the layout of the CSS Box Model and briefly describe each component.
    • What are the advantages of using CSS preprocessors?
    • What is the difference between ‘+’ and ‘~’ sibling selectors?.
    • Can you describe how CSS specificity works?
    • What is the difference between em and rem units?
    • Using flexbox, create a 3-column layout where each column takes up a col-{n} / 12 ratio of the container.
    • What is a focus ring? What is the correct solution to handle them?
    • Can you name the four types of @media properties?
    • What are the advantages of using CSS sprites and how are they utilized?
  • Chapter 7: Javascript Questions
    • What is an async function?
    • Create a function batches that returns the maximum number of whole batches that can be cooked from a recipe.
    • What is Big O Notation?
    • Create a standalone function bind that is functionally equivalent to the method Function.prototype.bind.
    • How can you avoid callback hells?
    • What is a callback? Can you show an example using one?
    • How do you clone an object in JavaScript?
    • What is a closure? Can you give a useful example of one?
    • How do you compare two objects in JavaScript?
    • What is CORS?
    • What is debouncing?
    • What is the difference between the equality operators == and ===?
    • What is event delegation and why is it useful? Can you show an example of how to use it?
    • What is event-driven programming?
    • What is the difference between an expression and a statement in JavaScript?
    • What are truthy and falsy values in JavaScript?
    • Generate an array, containing the Fibonacci sequence, up until the nth term.
    • Given an array of words, write a method to output matching sets of anagrams.
    • What does 0.1 + 0.2 === 0.3 evaluate to?
    • What is the difference between the array methods map() and forEach()?
    • What is functional programming?
    • What will the console log in this example?
    • How does hoisting work in JavaScript?
    • What is the reason for wrapping the entire contents of a JavaScript source file in a function that is immediately invoked?
    • Explain the differences between imperative and declarative programming.
    • What is the difference between lexical scoping and dynamic scoping?
    • Create a function that masks a string of characters with # except for the last four (4) characters.
    • What is memoization?
    • What is a MIME type and what is it used for?
    • Contrast mutable and immutable values, and mutating vs non-mutating methods.
    • What is the only value not equal to itself in JavaScript?
    • What is the difference between null and undefined?
    • Describe the different ways to create an object. When should certain ways be preferred over others?
    • What is the difference between a parameter and an argument?
    • Does JavaScript pass by value or by reference?
    • Create a function pipe that performs left-to-right function composition by returning a function that accepts one argument.
    • What is the difference between the postfix i++ and prefix ++i increment operators?
    • What are Promises?
    • In which states can a Promise be?
    • How does prototypal inheritance differ from classical inheritance?
    • What is a pure function?
    • What is recursion and when is it useful?
    • What is the output of the following code?
    • What does the following function return?
    • Are semicolons required in JavaScript?
    • What is short-circuit evaluation in JavaScript?
    • Explain the difference between a static method and an instance method.
    • What is the difference between synchronous and asynchronous code in JavaScript?
    • What is the this keyword and how does it work?
    • What does the following code evaluate to?
    • What are JavaScript data types?
    • What is the purpose of JavaScript UI libraries/frameworks like React, Vue, Angular, Hyperapp, etc?
    • What does 'use strict' do and what are some of the key benefits to using it?
    • What are the differences between var, let, const and no keyword statements?
    • What is a virtual DOM and why is it used in libraries/frameworks?
    • What is a cross-site scripting attack (XSS) and how do you prevent it?
  • Chapter 8: React Questions
    • What is the purpose of callback function as an argument of setState?
    • Which is the preferred option between callback refs and findDOMNode()?
    • What is the children prop?
    • Why does React use className instead of class like in HTML?
    • What is context?
    • What is the difference between an element and a component in React?
    • What are error boundaries in React?
    • What are fragments?
    • What are higher-order components?
    • What is the difference between HTML and React event handling?
    • What are inline conditional expressions?
    • What is a key? What are the benefits of using it in lists?
    • What are the lifecycle methods in React?
    • What are the different phases of the component lifecycle in React?
    • What does lifting state up in React mean?
    • How do you ensure methods have the correct this context in React component classes?
    • How do you pass an argument to an event handler or callback?
    • What are portals in React?
    • How to apply prop validation in React?
    • How do you write comments inside a JSX tree in React?
    • What are refs in React? When should they be used?
    • What is a stateful component in React?
    • What is a stateless component?
  • Chapter 9: NodeJS Questions
    • NodeJS often uses a callback pattern where if an error is encountered during execution, this error is passed as the first argument to the callback. What are the advantages of this pattern?
    • What is the event loop in Node.js?
    • What is REST?
  • Chapter 10: Free Exclusive bonus books
  • Keep developing your interviewing skills

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