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Gain access to hundreds of pre-vetted JavaScript developers. Watch videos of coding challenges, skill assessments, and interview question clips along with their responses, all evaluated by our professional vetting team.
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JavaScript
Senior / EST±3
Match with
JavaScript
professionals that your team needs
Liliana Bedolla
Liliana Bedolla
Senior Software Architect
Brazil
»
ETC-3
Vetted Expertise
JavaScript
Flutter
7
 Yrs
Score 
9.6
Additional Experience With:
Martin Costa
Martin Costa
Senior Software Architect
Venezuela
»
ETC-4
Vetted Expertise
JavaScript
Flutter
5
 Yrs
Score 
9.5
Additional Experience With:
Antonio Bezerra
Antonio Bezerra
Senior Software Architect
Chle
»
ETC-4
Vetted Expertise
JavaScript
Flutter
6
 Yrs
Score 
9.5
Additional Experience With:
Susana Arteaga
Susana Arteaga
Senior Software Architect
Guatemala
»
ETC-6
Vetted Expertise
Flutter
JavaScript
7
 Yrs
Score 
9.3
Additional Experience With:

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JavaScript Developer Hiring Guide

Introduction

Hiring a skilled JavaScript developer is essential for any organization building modern, interactive web applications. However, finding the right person for the job can be challenging, especially if you're not a technical expert. That's where this JavaScript Developer Hiring Guide comes in. If you are not looking to hire JavaScript developers through FullStack, we have designed this comprehensive guide with everything you need to know to hire the best front-end JavaScript developers for your organization. From conversational and technical interview questions to a job posting template and coding challenge, this guide will equip you with the tools to identify the best candidates and build a high-performing JavaScript development team.

{{interview-qa-header="/hiring-docs/javascript"}}

1. What is your experience with JavaScript frameworks and libraries?
I have extensive experience working with various JavaScript frameworks, including React, Angular, and Vue. I am familiar with the advantages and disadvantages of each framework and can choose the most suitable one for the project requirements.
2. Can you explain the difference between synchronous and asynchronous programming in JavaScript?
Synchronous programming involves executing tasks one after another, while asynchronous programming involves executing tasks simultaneously. In JavaScript, asynchronous programming is achieved through callback functions, promises, and async/await.
3. How do you ensure the performance of a JavaScript application?
I optimize the code by reducing the number of HTTP requests, using minification and compression, caching data, and using lazy loading. I also use performance analysis tools to identify bottlenecks and optimize the code accordingly.
4. How do you handle errors in JavaScript?
I use try-catch statements to handle errors and provide meaningful error messages for better debugging. I also use JavaScript debuggers and logging tools to identify and fix errors.
5. Can you explain the concept of closures in JavaScript?
Closures are functions that can access variables outside their own scope. They are created when a function returns another function, and the returned function still has access to the parent function's variables.
6. What is your experience with testing JavaScript code?
I have experience with various testing frameworks, including Jest, Mocha, and Jasmine. I also use code coverage tools to ensure that code is thoroughly tested.
7. Can you explain the concept of hoisting in JavaScript?
Hoisting is a JavaScript behavior that moves variable and function declarations to the top of their scope. This means you can use a variable or function before it is declared.
8. How do you ensure the security of a JavaScript application?
I use secure coding practices such as input validation, output encoding, and authentication and authorization mechanisms. I also keep up-to-date with the latest security vulnerabilities and patch the code accordingly.
9. What is your experience with JavaScript package managers?
I have experience with popular package managers such as npm and Yarn. I use them to manage dependencies, install and update packages, and handle versioning.
10. Can you explain the concept of event bubbling in JavaScript?
Event bubbling is a JavaScript behavior where an event that is triggered on a child element is also triggered on its parent elements. This can be used to handle events more efficiently and organizationally.

{{tech-qa-header="/hiring-docs/javascript"}}

1. How do you find the first non-repeating character in a given string in JavaScript?

Answer:

function findFirstNonRepeatingChar(str) {
  for (let i = 0; i < str.length; i++) {
    if (str.indexOf(str[i]) === str.lastIndexOf(str[i])) {
      return str[i];
    }
  }
  return null;
}

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2. How do you implement a debounce function in JavaScript?

Answer:

function debounce(func, delay) {
  let timeout;
  return function() {
    const context = this;
    const args = arguments;
    clearTimeout(timeout);
    timeout = setTimeout(() => func.apply(context, args), delay);
  };
}

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3. How do you implement a debounce function in JavaScript?

Answer:

function debounce(func, delay) {
  let timeout;
  return function() {
    const context = this;
    const args = arguments;
    clearTimeout(timeout);
    timeout = setTimeout(() => func.apply(context, args), delay);
  };
}

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4. How do you find the intersection of two arrays in JavaScript?

Answer:

function findIntersection(arr1, arr2) {
  const intersection = [];
  arr1.forEach((item) => {
    if (arr2.includes(item)) {
      intersection.push(item);
    }
  });
  return intersection;
}

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5. How do you implement a queue using an array in JavaScript?

Answer:

class Queue {
  constructor() {
    this.queue = [];
  }
  enqueue(item) {
    this.queue.push(item);
  }
  dequeue() {
    return this.queue.shift();
  }
  peek() {
    return this.queue[0];
  }
  size() {
    return this.queue.length;
  }
}

{{job-qa-header="/hiring-docs/javascript"}}

Introduction

The introduction is the first thing a potential candidate will read, so it's essential to make it engaging and informative. In this section, you should provide a brief overview of the company and the position.

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<span class="guide_indent-text">Example:</span>

<p span class="guide_indent-text">Welcome to XYZ Company! We're a leading tech firm in the heart of Silicon Valley, and we're looking for a talented JavaScript Developer to join our team. As a JavaScript Developer at XYZ Company, you'll have the opportunity to work on cutting-edge projects with a dynamic and collaborative team.</p>

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Job Description

In the job description section, you should provide a detailed overview of the position, including the responsibilities and requirements. This will help ensure everyone is on the same page about the JavaScript developer position.

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<span class="guide_indent-text">Example:</span>

<p span class="guide_indent-text">The JavaScript Developer will be responsible for developing and maintaining complex web applications using JavaScript and related technologies. The ideal candidate will have experience with modern JavaScript frameworks like React and Angular, as well as proficiency in HTML, CSS, and responsive design. The successful candidate will work closely with the design and product teams to deliver high-quality applications that meet our users' needs.</p>

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Key Responsibilities

In this section, you should list the primary responsibilities of the JavaScript developer position. These might include things like:

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<ul><li>Developing and maintaining complex web applications using JavaScript and related technologies</li><li>Collaborating with cross-functional teams to deliver high-quality applications</li><li>Ensuring the technical feasibility of UI/UX designs</li><li>Developing and maintaining coding standards and best practices</li><li>Troubleshooting and debugging code issues</li></ul>

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Required Qualifications

In this section, you should list the minimum qualifications required for the position. These might include things like:

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<ul><li>Bachelor's degree in Computer Science or related field</li><li>3+ years of experience developing complex web applications using JavaScript and related technologies</li></li><li>Proficiency in modern JavaScript frameworks like React and Angular</li><li>Strong knowledge of HTML, CSS, and responsive design</li><li>Experience with version control systems like Git</li></ul>

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Preferred Qualifications

In this section, you should list any additional qualifications that would benefit the candidate. These might include things like:

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<ul><li>Experience with testing frameworks like Jest or Enzyme</li><li>Familiarity with server-side JavaScript frameworks like Node.js</li><li>Experience working with Agile methodologies</li><li>Excellent written and verbal communication skills</li><li>Strong problem-solving and critical-thinking skills</li></ul>

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Benefits

In this section, you should list the salary range for the position and any benefits the company offers. These might include things like:

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<ul><li>Competitive salary based on experience</li><li>Comprehensive health, dental, and vision insurance</li><li>401(k) plan with matching contributions</li><li>Generous paid time off policy</li><li>Flexible work schedule and remote work options</li></ul>

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How to Apply for the JavaScript Developer

The how to apply section should outline the application process, including what materials JavaScript developer candidates should submit, how they should submit them, and any deadlines or other requirements. Be clear and concise about what you're looking for and how to apply.

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<span class="guide_indent-text">Example:</span>

<p span class="guide_indent-text">To apply for this position, please send your resume, cover letter, and any relevant work samples to careers@company.com. Please include "JavaScript Developer" in the subject line. Applications will be accepted until June 30th, 2022. We look forward to hearing from you!</p>

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Conclusion

By following this template for a JavaScript developer job posting, you can attract the best candidates and ensure that you find the right person for the job. Remember to be specific about the requirements and responsibilities, highlight the benefits, and provide clear instructions for applying. Good luck in your search for a talented JavaScript developer!

{{challenge-qa-header="/hiring-docs/javascript"}}

Challenge instructions:

Write a function called getMostFrequentWords that takes in a string of text and returns an array of the 5 most frequently occurring words in the text. Your function should ignore common English stop words like "the", "and", "a", "an", etc. Your function should also ignore words with fewer than 3 characters.

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Use this text string as your input: This is a sample sentence with some sample words that are repeated. Some of these words are common English stop words like 'the' and 'a'.

Answer:

function getMostFrequentWords(text) {
  const stopWords = ["the", "and", "a", "an", "of", "in", "to", "that", "this"];
  const wordCounts = {};
  
  // Remove punctuation and convert to lowercase
  const cleanedText = text.replace(/[.,\/#!$%\^&\*;:{}=\-_`~()]/g,"").toLowerCase();

  // Split text into array of words
  const words = cleanedText.split(" ");
  
  // Count occurrences of each word
  for (let i = 0; i < words.length; i++) {
    const word = words[i];
    if (word.length >= 3 && !stopWords.includes(word)) {
      if (wordCounts[word]) {
        wordCounts[word]++;
      } else {
        wordCounts[word] = 1;
      }
    }
  }

  // Sort words by frequency and return top 5
  const sortedWords = Object.keys(wordCounts).sort((a, b) => wordCounts[b] - wordCounts[a]);
  return sortedWords.slice(0, 5);
}

const result = getMostFrequentWords("This is a sample sentence with some sample words that are repeated. Some of these words are common English stop words like 'the' and 'a'.");
console.log(result); // ["sample", "words", "repeated", "sentence", "common"]

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Conclusion

In conclusion, hiring a skilled JavaScript developer is critical to the success of any web development project. Using the resources provided in this JavaScript Developer Hiring Guide, you can identify the most talented candidates, evaluate their skills and experience, and ultimately hire the best JavaScript developer for your organization. Whether you're a startup looking to build a cutting-edge web application or an established company looking to expand your development team, this guide will provide the insights and tools you need to hire the right JavaScript developer. So start using this guide today to build a top-performing JavaScript development team!

Frequently Asked Questions

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