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D3.js freelance developer

Rishabh is a software engineer having 7+ years of experience creating visual representations and binding graphical elements to DOM using D3.js. He is also an expert using Javascript.

Expert in






10 Years


Full Time


D3.js freelance developer

Mahesh is a software engineer having 3+ years of experience creating visual representations and binding graphical elements to DOM using D3.js. He is also an expert using Javascript.

Expert in






10 Years


Full Time


Part-time D3 freelancer

John is a software engineer having 10+ years of experience creating visual representations and binding graphical elements to DOM using D3.js. He is also an expert using Javascript.

Expert in






10 Years


Full Time

Hire dedicated freelance D3.js developers with UltraGenius

D3 is an acronym for Data-Driven Documents and is a widely used Javascript library used to create data visualizations and manipulate data documents by binding the graphical elements and data to the Document Object Model (DOM). The visual representations created using D3 library are responsive up to a large extent. D3.js provides awesome features for creating animations and user interactions on web browsers. D3.js is the most effective tool to associate data with the DOM and helps Javascript and D3 developers in data visualization.

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Want to hire freelance D3.js developers on your own? Here are the skills you must look for while hiring a D3.js freelance developer

Hiring freelance D3.js developers might be an intricate task for you if you are a non-technical manager. D3.js is a popular library known for providing best features to create visualizations and manipulating data documents. D3 uses HTML, CSS, and SVG for designing user interactive visual representations and has in-built features for animations.  But, hiring the most skilled freelance D3.js developers among  thousands of developers is challenging for anybody. So, here UltraGenius comes to assist you while recruiting the top freelance D3.js developers on your own. UltraGenius understands your job requirements and gets you only the top freelance D3.js developers who have in-depth knowledge of software development.

The following skills you must look for while hiring a freelance D3.js developer – 

Familiarity with the core HTML, CSS, and Javascript

D3.js is designed in Javascript and uses HTML, CSS, and SVG for its working. The freelance D3.js developer must have strong knowledge of these core technologies. The developer must know more than one Javascript library framework like jQuery, Bootstrap and must be specialized in working with Asynchronous Javascript and XML (AJAX). Check if the developers have worked with Leaner CSS and Syntactically Awesome Stylesheet (SASS) and have knowledge of Javascript build tools such as Grunt.js, Gulp.js, and Bower.js.

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Javascript fundamentals + ES6

The developer must be clear about the fundamental concepts of Javascript language alongwith these ES6 skills –

  • Variables and scoping
  • Arrays and object
  • Array methods
  • Functions and arrow functions
  • DOM Manipulation and event handler
  • The “this” keyword
  • The “class” keyword
  • Prototype chain and object creation
  • Higher order functions and callback functions
Well conversant with JS build tools

While working on real world projects, D3 freelance developers must know how to use build tools or task runners. webpack, grunt, browserify, gulp, and bower are the examples of build tools. Build tools help in combining multiple files into one (bundling), removing unused code (tree shaking), converting modern ES6+ Javascript into Javascript which an older version of browser can understand (transpiling), etc.

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Excellent understanding of testing frameworks and tools

Rising quick-deployment needs during the development phase, testing has become an important skill for developers. Therefore, the freelance D3.js developers should know about Jest, Enzyme, Mocha, Chai, AVA, and Tape for unit testing. For end-to-end testing, they must know about Selenium, Webdriver, Cucumber.js, Nightwatch.js, Cypress, and Puppeteer. For integration testing, they must know about Karma.

Experienced in working with Version Control System (VCS)

Freelance D3.js developers must have a very good knowledge of version control systems, like Git, SVN, TFS, and Mercurial. Mostly, developers use Git for their work. It is the version control system that helps the team in collaborating and organizing your code, maintain the frequent changes that occur in the code. Git helps in reviewing the old codes and compares them with the newly updated code, pulling the code from their repository, and managing the commit history.

Along with this, the developer must know how to use add, push, pull, and commit commands, branching, and merging as it allows developers to work independently on the code.

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Knowledge of front-end frameworks like Angular or React

Familiarity with at least one of the front-end frameworks like React.js or Angular.js is beneficial for any D3.js developer. D3.js freelance developer works on the front-end to create beautiful animations and does statistical data analysis through bar graphs and pie charts.  For creating rich and effective data visualizations in your Angular or React application, the developers use D3 library. 

Implementing enter and exit selection

The freelance D3.js developer is able to create new nodes for the input data and delete outgoing nodes that are no longer required. When an element is considered for selection, the pairing of each element in the data array is done with the corresponding node. If the number of nodes are less as compared to data, then the extra elements make the enter selection.

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Experience with web markup and UI, UX Concepts

The freelance D3.js developer must have a firm understanding of element positioning, displaying the elements, and making components interactive, semantic markup, and other related UX Concepts so they can design the product with the best quality. The developer must be experienced in developing visual effects in presentational markup. For, example – How the heading appears, making text larger and putting weight to it, and giving which color to it, and which markup can include captions, bind columns, and row headings to table cells. 

Knowledge of W3C DOM API and W3CSelectors API

The freelance D3.js developer must know how to modify documents using W3C DOM APIs. D3 also has a declarative approach to operate on random set of nodes known as selection. W3C Selectors API define the Selectors that are supported by the web browsers natively. D3 also provides direct access to the underlying nodes.

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Proficient in writing optimized and readable code

The freelance D3.js developer must have a strong problem solving skill as it helps developers to utilize existing solutions for the projects more efficiently, thinking abstractly, and enables them to write pseudocode for their project. The developer must know how to debug the code as well. Also, check if the freelance D3.js developer is able to write clean and concise code and can fluently communicate with other team members while explaining the code.

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D3.js is widely used for creating animations and manipulating data driven documents to the Document Object Model (DOM).  A freelance D3.js developer does the job of designing and maintaining the user interface components. But recruiting the top talented freelance D3.js developers is not an easy task when a large no. of developers are competing to grab the job opportunities.

Top Interview Questions to ask while hiring a freelance D3.js developer

Dispatching in D3.js provides a mechanism for loosely coupled components while co-ordinating views with shared state. D3 has in-built dispatch method called d3.dispatch ('event1', 'event2') which returns the object that handles setting displaying events and event handlers.

The d3.contourDensity() function is used for constructing a new density estimator function with the settings as default. The density estimator function predicts the density for a given data set. The syntax of the function is d3.contourDensity() and it returns a density estimator function.

HTML attributes provide additional information about HTML elements. 

href attribute - The href attribute is used to specify the URL of the page link it must be directed to. For example, <a href = "www.ultragenius.club">Top Decentralized Network connecting most talented developers with leading companies</a>.

src attribute - The src attribute in the img tag specifies the URL source of the image which is to be displayed. For example, <img src ="abc.jpg">.

width and height attribute - To specify the width and height of an image, the width and height attribute is used. For example, <img src = "abc.jpg" width = "300" height = "300">.

alt attribute - The alt attribute specifies the alternate text for the image, if for some reason the image cannot be displayed. For example, <img src = "abc.jpg" alt = "UltraGenius">.

style attribute - This attribute adds style to an element like color, font, size, etc. For example, <p style = "color : #3873ea;">This is a blue paragraph.</p>.

lang attribute - The lang attribute is used to assist the web browser about the language of a webpage. For example, 

<html lang = "en-US"?> which is specifying that the language is English and country is USA.

SVG stands for Scalable Vector Graphics. It is an XML based two-dimensional graphics format used for sharing graphics content on the Internet.  SVG images and their related information is stored in XML text-files so that they can be easily indexed, scripted, searched, and compressed.

D3.js provides the function d3.select() which is designed for selecting the first element that matches the specific selector string. If more than one elements is matched with the specified selector string, then it returns only the first matching string. If not a single element is matched, then it returns an empty selection. 

The d3.selection.enter() function is used for creating initial join of data to the elements. enter() creates one circle element for each and every element in the data array. After you click the button, the alternative array is joined again to the graphical elements.

The d3.selection.exit() function is used to remove the circle elements which are no longer required. It updates the <div> elements that were created before the new data is given.

The update() function updates the radius of each circle element once all circle elements are defined properly. 


Some of the useful methods for computing the basic statistics : -

  • d3.max - It is used to calculate maximum value in an iterable.
  • d3.min - It is used to calculate minimum value in an iterable.
  • d3.maxIndex - It calculates the index of the maximum value of an iterable.
  • d3.minIndex - It calculates the index of the minimum value of an iterable.
  • d3.sum - It computes the sum of an iterable of numbers.
  • d3.mean - It calculates the arithmetic mean of an iterable of numbers.
  • d3.median - It calculates the median of an iterable of numbers.
  • d3.mode - It calculates the most common value of an iterable of numbers.
  • d3.cumsum - It calculates the cumulative sum of an iterable of numbers.
  • d3.rank - It calculates the rank order.
  • d3.variance - It calculates the variance of an iterable of numbers.
  • d3.deviation - It calculates the standard deviation of numbers.

The selection.node() function returns the first element in the selection. If the selection does not return any elements, it returns null. While the selection.nodes() function returns an array of HTML elements in the selection.

There are several ways of inserting tabs/spaces in HTML or CSS - 

  • Using tab-size property for setting space for tab characters - The tab-size property in CSS sets the number of spaces each tab character will show. Changing the value of tab-size property inserts the required space in one tab character. It works only with pre-formatted text (using <pre> tag).
  • Using the special characters  -  The &nbsp; character denotes non-breaking space which is fixed. It is perceived as twice the normal space. The &ensp; means half-point size of the current font. It is perceived as twice the normal space. The &emsp; means equivalent to point-size of the current font. It can be assumed as four times the normal space.

Frequently Asked Questions

UltraGenius is one of the leading platforms for hiring remote talent and connecting freelance and part-time developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out only the top 1% most skilled freelance developers among the 20K+ developers who have applied on our platform. Candidates have to prove their self-reported experience by giving UltraGenius’ s skill tests.

UltraGenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which is a video round that deeply analyzes freelance developers’ major skills and asks questions about the projects they have worked upon.

Fill up the form which is on every hiring freelancers’ page and we will inform you once we select the top 1% freelance D3.js developers matching your job requirements.  After analyzing the candidates based on their resumes and two assessment tests, we provide you the feedback quickly. And if the freelancers selected by our team are fit for your job role, then we also provide the onboarding.

UltraGenius offers you only the most skilled freelance developers who are top 1% among the 20K+ freelance developers who have applied on our platform. After a rigorous selection and testing process, we sort out only the top candidates for you. You can check out UltraGenius’ s selection process for hiring freelance D3 developers on https://www.ultragenius.club/hire-d3-freelancer/.

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