“Any application that can be written in JavaScript, will eventually be written in JavaScript.” As the Atwood law quotes, any tech entrepreneur needs a skilled JavaScript developer mastering styled-components and JS frameworks. With DistantJob, you can hire the best JavaScript developer worldwide. Our recruitment team can help you find timezone-friendly handpicked and vetted JavaScript developers in less than two weeks at a fraction of US costs.
As a leading remote IT recruitment agency, we care that our clients take part throughout the hiring process. Why? Because for us, hiring a qualified candidate is not only about the skills and abilities, but it’s also about how candidates match with your company’s culture.
As soon as you talk with us or fill our form, the first thing we do is analyze your company. We set up a call with you to understand your culture and the type of people you value working with.
We reach out to hundreds of candidates that we think might be a possible match for you. In 2 weeks, you’ll start reviewing people that match your requirements. We focus on providing you 3-5 top candidates instead of giving you an endless list.
Once you select the candidate, we handle all the contracts and payments from day 1. We also take the legal steps required to protect your IP.
When it comes to hiring a JavaScript developer, your first step is to isolate and list the exact tasks and requirements for your project. Second, define the minimum level of experience required. And third, decide the type of contract that will optimize your company’s costs by hiring the best candidate.
To ensure the best results with the minimum expenses, at DistantJob, we recommend hiring remote full-time developers. In fact, remote recruitment is the most effective solution to hiring a JavaScript Developer at a fraction of US costs. Targeting the research for geographical areas, you can find:
The reasons why we recommend full-time remote contracts lies in our 10 years of activities as a remote company in the recruitment tech field. Building a long-lasting professional relationship with an in-house JavaScript developer allows you to keep continuity on a running project, have support for training new team members and temporary collaborations, and work with someone who deeply understands your business and customers’ needs. As a result, you optimize costs by maintaining high-quality products over time.
The first thing a JavaScript developer must master is the coding language. As a dynamic and prototype-based language, it’s necessary to understand the paradigm and control flow.
Client-side frameworks and libraries allow JavaScript Developers to access higher-level API to perform better by writing less code. Each client-side framework is different, but they all address compatibility, security, and accessibility.
From code review to pair programming, an experienced JavaScript developer is used to asynchronous programming.
A JavaScript developer must be able to write cross-browser code, creating compatible software for multiple browsers.
React JS is one of the most popular JavaScript libraries that allows interactive and user-friendly interfaces to be created quickly and efficiently.
Redux is a React state management system. With Context API, Redux is crucial to exploit React e-commerce functionalities’ performance.
Node JS is a run-time tool for Back-end frameworks and ensures high performance and maintenance of the running application.
Git is a version control system to track coding changes and facilitate asynchronous coding and remote workflow.
TypeScript is a transpile to clean ES5 code, reducing browser compatibility, safety, and scaling difficulty issues.
Free and open-source software jQuery library simplifies HTML DOM tree traversal and manipulation, from CSS, animation, to Ajax. Also, it’s available.
1. What is DOM?
DOM is the Document Object Model and is used by HTML to represent the elements and contents of a page.
JavaScript can be used to manipulate this model, which is why it’s such a prevalent language in web development.
2. What are the data types JavaScript uses?
There are both primitive types and non-primitive types. Primitive types represent basic types such as numbers and strings.
| typeof ‘DistantJob’ // Returns “string” typeof “DistantJob” // Returns “string” typeof 5 // Returns “number” typeof 5.5 // Returns “number” typeof true // Returns “boolean” typeof 178233587725359997576391063983941630941986816n // Returns bigint typeof undefined // Returns “undefined” typeof null // Returns “object”, a common pitfall of JavaScript typeof Symbol(‘symbol’) // Returns Symbol |
Non-primitive types can be objects housing complex data structures (such as a vector or a coordinate) or arrays to store variables.
| var vector = { x: 10, y: 5.0, z: 10.5 } var array = [“A String”, 5, false] |
3. What is Implicit Type Coercion in JavaScript?
When operations are performed between two variables of different data types, JavaScript automatically converts the types in order to carry out the operation.
When adding a number to a string, the number is automatically converted to a string as well.
| var a = 5; var b = “5”; a + b // Returns “55” |
However, when subtracting the opposite occurs and the string is converted to a number.
| var a = 5; var b = “5″; a – b // Returns 0 |
4. What are the differences between the comparisons “==” and “===”?
This answer is closely related to the Implicit Type Coercion mentioned above.
| var a = 5; var b = “5”; (a == b) // Returns true, since the values are the same (a === b) // Returns false, since a is a number and b is a string |
5. What are callbacks?
Callbacks are functions that get executed when certain conditions are met (usually at the end of a function’s execution). They can be passed as parameters to another function so it can be executed inside its body or stored as an object’s property. It’s commonly used to signal a function´s correct or incorrect execution.
| function odd(value){ console.log(value + ” is odd!”); } function even(value){ console.log(value + ” is even!”); } function checkNumber(num,oddFunction, evenFunction){ if(number % 2 == 0) { evenFunction(num); } else { oddFunction(num); } } checkNumber(“5, odd, even); // Prints “5 is odd!“ checkNumber(10, odd, even); // Prints “10 is even!“ |
1. What are the differences between declaring variables with the keywords var, let and const?
When the ECMAScript 6 (ES6) version was introduced in 2015, it introduced two new keywords to declare variables outside the traditional global scope of the var keyword: let and const. These add further control to the accessibility of variables within the code:
| var | let | const | |
| Global Scope | Yes | No | No |
| Function Scope | Yes | Yes | Yes |
| Block Scope | No | Yes | Yes |
| Can be reassigned? | Yes | Yes | No |
2. What is the prototype design pattern?
The prototype design pattern allows developers to set up default values for objects, initializing them. It is commonly used to define functions inside objects before the introduction of ES6 or to define new properties of existing object constructors.
| function Person(name,age){ this.name = name; this.age = age; } Person.prototype.job = “JavaScript Developer”; Person.prototype.getDetails = function() { return “Name: “ + this.name + “, Age: “ + this.age + “, Job: “ + this.job; } var damian = new Person(“Damian”, 31); damian.getDetails(); // Returns “Name: Damian, Age: 31, Job: JavaScript Developer” |
3. What are classes in Javascript?
Classes were introduced in ES6 and are syntactic sugar for constructor functions. These objects hold pertinent data and can house functions to operate over said data.
Before ES6, to emulate classes, you’d have to do something like:
| function Person(name,age){ this.name = name; this.age = age; } Person.prototype.getDetails = function(){ return ‘Name: ${this.name}, Age: ${this.age}’; } var anna = new Person(“Anna”, 16); anna.getDetails(); // Returns “Name: Anna, Age: 16” |
With ES6, this while process got much simpler with the introduction of proper classes:
| class Person{ constructor(name,age){ this.name = name; this.age = age; } getDetails(){ return ‘Name: ${this.name}, Age: ${this.age}’; } } let ian = new Student(“Ian”, 22); ian.getDetails(); // Returns “Name: Ian, Age: 22” |
4. What are arrow functions?
Also introduced in ES6, arrow functions are ways to declare expression-based functions with shorter syntax.
Before ES6, functions needed to be declared as:
| var square = function (num) { return num * num; } var sum = function (num1, num2) { return num1 + num2; } |
In ES6, they can be declared as:
| var square = num => num * num; var sum = (num1, num2) => num1 + num2; |
Another functionality introduced in ES6, the rest parameter allows functions to receive an undefined number of arguments.
| var sumAll= function (…inputs) { let sum = 0; for(let i of inputs){ sum += i; } return sum; } // These calls are valid sumAll(1); sumAll(1, 2); sumAll(1, 2, 3); sumAll(1, 2, 3, 4); sumAll(1, 2, 3, 4, 5); |
The rest parameter can be used alongside other defined inputs, but must always be the last one in the function’s definition.
| var sumAll2 = function (a, b, …otherInputs) { let sum = a + b; for(let i of otherInputs){ sum += i; } return sum; } // This call is invalid, since b is undefined sumAll2(1); // These calls are valid sumAll2(1, 2); sumAll2(1, 2, 3); sumAll2(1, 2, 3, 4); sumAll2(1, 2, 3, 4, 5); |
In the US, the average salary to hire a Senior JavaScript Developer is $115.000/year. Talent.com indicates $136.500/year, Indeed $111.308/year, and Glassdoor $110,860/year. However, the annual salary depends on the geographical area, skill set, work arrangement, and year of experience.
If you recruit in different places outside the US, you can find talented and experienced candidates at affordable costs. In some countries, the living costs are lower. You can offer a convenient contract for a full-time remote position, ensuring a talented addition to your team and reducing your turnover rate. Here is an overview of the Annual salary for JavaScript developers outside the US:
JavaScript is one of the popular programming language for automating simple tasks for building complex software applications:
Talented and certified JavaScript developers know how to handle multiple requests simultaneously while managing pending line-ups executions running fast.
The best JavaScript developer will have experience with front-end and back-end development, managing server-side and client-side alike. When you hire a JavaScript developer, remember how the role needs to be aware of back-end services to create smooth UI/UX experiences and vice-versa.
A skilled JavaScript developer knows how to scale your company’s website or app to track your web product.
JavaScript features like styled-components, async-await JavaScript, .then JavaScript, or WebGL ensure high performance of web products, creating fast and interactive interfaces for users.
Further support and technical maintenance of upcoming websites and mobile applications are the main concern for any manager. If you hire a JavaScript developer, you can guarantee constant maintenance to your web product over time.
Ready to hire the best developers, 40% faster than the industry average? Give us your email, and our account manager will get in touch ASAP!
You live, breathe and eat code, and have fun figuring out how to solve problems. And you love living in South America or Eastern Europe. But you don’t feel as fulfilled as your friends in North America.
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