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jQuery is crucial in creating interactive and feature-rich websites in the dynamic web development landscape. To harness the full potential of this powerful JavaScript library, businesses need to assemble a team of skilled jQuery developers. In this guide, we look into why jQuery is still a fighting skill in the digital world despite the coming up of better technologies.

So, how do you do that?

About jQuery

jQuery is a fast, small, and feature-rich JavaScript library designed to simplify things like HTML document traversal and manipulation, event handling, and animation with an easy-to-use API that works across many browsers. It is a favorite among web developers for its simplicity, compatibility with multiple libraries, and a huge network. It helps developers write simple code for complex JavaScript functionality, making their work easily manageable.

jQuery's usability, combined with a truly mammoth collection of easily written plugins, has cemented it as one of the critical skills of the technology industry. jQuery fluency isn't just the ability to call a library - it's an understanding of what designs offer efficient, responsive web work.

Many companies hire jQuery developers to speed up their website coding and development process and ensure a similar user experience occurs on all browsers.

Industries and applications

jQuery takes place in varied industries, starting from eCommerce to enterprise-level applications. It stands out in upgrading web applications for the user interface and user experience. For instance, in eCommerce, jQuery helps build interactive product galleries and create streamlined checkout processes. In content management systems, it lends a hand to building dynamic content and user interfaces. Its ability to interoperate directly with other web technologies makes jQuery an intelligent choice for companies that want to develop a solid, interactive web application with minimum overhead.

The primary reason why companies adopt the jQuery library is because its ecosystem of plugins is completely extensive. This gargantuan library allows quick feature development from simple animations to intricate user interface components without the requirement to begin each time on a blank slate.

Technical skills every jQuery Developer must know

When hiring a developer to work with jQuery, your candidate must demonstrate at least the basics of various technical skills needed for successful website development. Here are the essential competencies:

1. Expert knowledge in jQuery and JavaScript: The candidate is expected to be equipped with advanced concepts of jQuery. They must have expertise in selector, Document Object Model manipulation, event handling, and animation in jQuery. An even more profound knowledge of JavaScript is necessary, primarily because jQuery is built over JavaScript.
2. HTML and CSS experience: Since jQuery is typically used in manipulating the Document Object Model (DOM), a developer should have strong HTML and CSS proficiency. This includes knowing the layout techniques, responsiveness, cross-browser compatibility, and familiarity with selectors.
3. AJAX and JSON: They should also have proficiency in AJAX (Asynchronous JavaScript and XML) to master the development of dynamic and asynchronous web pages. They must be able to work with JSON (JavaScript Object Notation) - an accepted standard for data interchange.
4. Responsive design: The developer must know the principles of responsive web design and make a UI that works on all devices and screen sizes without losing functionalities.
5. Version control system: They must also understand systems like GIT in any collaborative development environment.
6. Debugging and testing: The candidate should have skills in debugging and testing, such as the jQuery code, to meet the requirement of robust and bug-free web applications.
7. Web performance optimization understanding: They should also be able to optimize web applications for speed and performance, including minimizing HTTP requests, optimizing assets, and being aware of behavior while rendering by a browser.
8. Complementary frameworks and libraries: Nothing could be better than having the knowledge or prior experience in complementary frameworks and libraries such as Bootstrap for its UI components and Angular.js to help in the advanced development of web applications.

Nice-to-have technical skills

Apart from the core competencies mentioned above, a good jQuery developer might also possess some of the following additional competencies:

• Server-side technologies: Basic exposure to scripting languages like PHP, Node.js, or Ruby on Rails.
• Advanced CSS Skills: Knowledge of different CSS pre-processing platforms like SASS or LESS.
• Experience with modern JavaScript frameworks: Experience working with modern JavaScript frameworks such as React or Vue.js may be an added advantage, though optional. Such knowledge would especially be beneficial when helping the team decide whether or not to migrate away from jQuery.
• UI/UX design principles: A basic understanding of design principles will help develop a more friendly and intuitive user interface.
• SEO basics: Understanding how jQuery affects SEO and how to optimize jQuery for search engines is essential.
• Web standards shared by many: Understanding web accessibility standards guarantees the usability of applications by as many people as possible.

Interview questions and answers

1. Briefly explain how you can improve the performance of a web page using jQuery.

Expected answer: The candidate should be able to state minimizing DOM manipulation as it is the most expensive operation, utilizing event delegation, caching jQuery selectors, and loading jQuery asynchronously.

2. Explain the differences between jQuery's .bind(), .live(), and .delegate() methods.

Expected answer: They should have been able to explain how these methods were used to bind event handlers, the slight difference between them, and how .on() has replaced them all in recent versions of jQuery.

3. Elaborate on a scenario where using vanilla JavaScript over jQuery is appropriate and better.

Expected answer: Watch out for an understanding of situations where jQuery may be overkill, such as simple DOM manipulations, or when performance is a critical concern.

4. How will you implement a feature requiring data from a server without refreshing the webpage?

Expected answer: The candidate should elaborate on Ajax for asynchronous data fetching with methods like .ajax(), .get(), .post(), and handling responses.

5. Describe how you would make a web application accessible using jQuery.

Expected answer: Some of the things that you should hear are ARIA roles, keyboard navigation, focus management, and semantic HTML.

6. How do you ensure your jQuery code is maintainable and scalable?

Example answer: Practices like modular coding avoid code repetition by using function comments and sticking to the coding standards.

7. Explain what selectors are in jQuery and how you will use them effectively.

Expected answer: A good answer would touch upon events delegation and propagation, as well as cover preventing events from bubbling, adding or removing custom events, and attaching event handlers to multiple events.

8. What makes a good response in this particular case? How would you approach event handling in jQuery?

Expected answer: Listen for information on direct and delegated event handlers using the .on() method and examples of binding events to elements.

9. Explain the difference between .each() and .map() in jQuery.

Expected answer: This looks like the types of candidates for .each() and explains that it iterates a jQuery object and executes a function for each matched element while .map() translates all items in an array or jQuery object into a new array.

10. How would you debug a jQuery script?

Expected answer: Consider some obvious methods like using browser developer tools, console logs, breakpoints, checking for script loading issues, and isolating problem code.

Summary

Hiring a good jQuery developer requires an understanding that transcends programming skills to delve into underlying web development principles and practices.

While technical core skills are essential for any competent jQuery developer, the additional 'nice-to-have' skills can significantly augment an individual's developer. During interviews, focusing on practical and scenario-based questions helps measure candidates' technical expertise, problem-solving skills, and critical thinking abilities.

In such an age of rapid web technologies, a well-skilled jQuery developer can be a natural addition to your team by bringing his expertise in developing any user-friendly web application.