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React.js Developers

Name: React.js Development Services
Brand: Trio
Rating: 4.5 (2440 reviews)

Trio focuses on finding only the best freelance React Developers to deliver impact within your team. All of our developers are proven domain experts in their field. Companies choose Trio to scale their teams faster with best-in-class talent.

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Lucas

React Developer

10 years of experience

Trusted by leading brands and startups

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Dhyego

React Developer

12 years of experience

Dhyego is a senior software developer with 12 years of experience in a wide range of projects and complexities. He specializes in software architecture, web development, and technical leadership, and is passionate about innovative solutions that drive business success. With his diverse experience and strong technical skills, he is a reliable and highly competent professional.

Dhyego is a senior software developer with 12 years of experience in a wide range of projects and complexities. He specializes in software architecture, web development, and technical leadership, and is passionate about innovative solutions that drive business success. With his diverse experience and strong technical skills, he is a reliable and highly competent professional.
- React
- React Native
- Node.js
- Flutter
- Vue.js
- Ruby
- JavaScript
- Python
- PHP
- Elixir
- Bash
- SQL
- NoSQL
- Docker
- GraphQL
- REST
- AWS
- Messaging
- Terraform
Hire Dhyego
Trio allowed us to find the proper talent needed for our clients' projects without having the burden of trying to interview them and have them on payroll full time internally.

Alec Harrison

Co-Founder & Design Specialist at Visual Boston
Carlos

React Developer

10+ years of experience

Carlos is a Software Engineer with a decade of experience in developing mobile and web applications for various companies situated in Germany, the USA, Israel, and Chile. He has worked across diverse domains, including healthcare, home automation, transport, HR, education, and Augmented Reality, seeking out innovative work settings that allow him to work with cutting-edge technologies, enhance business outcomes, and improve user experience.

Carlos is a Software Engineer with a decade of experience in developing mobile and web applications for various companies situated in Germany, the USA, Israel, and Chile. He has worked across diverse domains, including healthcare, home automation, transport, HR, education, and Augmented Reality, seeking out innovative work settings that allow him to work with cutting-edge technologies, enhance business outcomes, and improve user experience.
- React Native
- Next.js
- React
- OpenAI
Hire Carlos
When I connected with Trio, I had an MVP, and Trio helped me turn my idea into reality. I needed engineering support to come in and give the vision of where the product could go, how it could be scalable, and accessible for hundreds of thousands of users worldwide.

Cal Brunell

Co-Founder at Everyday Speech
Jhonatan

React Developer

9 years of experience

Jhonatan is a passionate software engineer with extensive experience in React and React Native, specifically building various front-ends across fintech and health tech. He also has back-end experience and is comfortable with dealing with systems integrations. He enjoys grappling with technical challenges and implementing solutions that positively impact end-users.

Jhonatan is a passionate software engineer with extensive experience in React and React Native, specifically building various front-ends across fintech and health tech. He also has back-end experience and is comfortable with dealing with systems integrations. He enjoys grappling with technical challenges and implementing solutions that positively impact end-users.
- React.js
- Javascript
- React Native
- Node.js
- Typescript
Hire Jhonatan
The thing that impressed me the most was that Trio was able to very quickly find us qualified candidates. We spent 6 months, and we couldn't hire an iOS or Android engineer, but Trio gave us one of each in 3 weeks.

Shaun Scovi

General Manager at Poloniex
Sérgio

React Developer

8 years of experience

Sérgio has been a software developer for the past 7 years, specializing in building web applications using Javascript and React. In addition, he possesses experience in developing APIs and mobile apps. His professional experience encompasses working with startups, agencies, and as a consultant. Sérgio is a team player and an effective communicator. He is self-taught, driven by challenges, and always keen to expand his knowledge.

Sérgio has been a software developer for the past 7 years, specializing in building web applications using Javascript and React. In addition, he possesses experience in developing APIs and mobile apps. His professional experience encompasses working with startups, agencies, and as a consultant. Sérgio is a team player and an effective communicator. He is self-taught, driven by challenges, and always keen to expand his knowledge.
- Javascript
- React
- Node.JS
- HTML
- CSS
Hire Sérgio
Trio's engineers helped us prioritize development so that we could get our platform out to our consumers as fast as possible. I'd describe a Trioneer as creative, committed, and enthusiastic, and I loved working with them because they felt like a member of our team.

Brianna Socci

Co-Founder & CPO at UBERDOC
Tuily

React Developer

8 years of experience

Tuily is an experienced front-end developer proficient in creating captivating websites and web applications, leveraging a robust expertise in constructing dynamic user interfaces. Beyond programming, he adeptly channels his artistic creativity towards the meticulous craft of 2D and 3D art.

Tuily is an experienced front-end developer proficient in creating captivating websites and web applications, leveraging a robust expertise in constructing dynamic user interfaces. Beyond programming, he adeptly channels his artistic creativity towards the meticulous craft of 2D and 3D art.
- React.js
- Next.js
- Javascript
- CSS
Hire Tuily
Trio just makes it easy to allocate engineers. They give you very transparent prices upfront for the skill set that you need, so scaling up our project is as easy as reaching out and saying, 'That's what we need!'

Mark Kimmerman

Partner and Product Manager at Cosmos
Lucas

React Developer

5 years of experience

Lucas is a highly skilled and versatile creative professional with a broad range of expertise developing web, mobile, and backend applications. He’s successfully completed projects of varying scales and catered to diverse clients, including the creation of crypto wallet solutions and military athlete program applications. Known for his efficiency and reliability, Lucas is the go-to professional for achieving exceptional outcomes and consistent results.

Lucas is a highly skilled and versatile creative professional with a broad range of expertise developing web, mobile, and backend applications. He’s successfully completed projects of varying scales and catered to diverse clients, including the creation of crypto wallet solutions and military athlete program applications. Known for his efficiency and reliability, Lucas is the go-to professional for achieving exceptional outcomes and consistent results.
- React
- Typescript
- Next.JS
- React Native
- Node.JS
Hire Lucas
Hiring takes a lot of time and effort, and to be able to have a partner like Trio has been super valuable for Visual Boston. Knowing their quality and how their vetting process is like, as opposed to shopping around not sure of what you are going to get, made Trio our best option.

Mark Stenquist

Co-Founder & Engineer Specialist at Visual Boston
Paulo

React Developer

5 years of experience

Paulo is an experienced full-stack software engineer. He possesses expertise in developing applications using JavaScript and TypeScript and utilizing popular frameworks such as Node.js, Vue.js, React.js, and Next.js. Paulo is passionate about creating maintainable code that can be easily comprehended and modified by fellow developers, while also prioritizing efficient and scalable architecture.

Paulo is an experienced full-stack software engineer. He possesses expertise in developing applications using JavaScript and TypeScript and utilizing popular frameworks such as Node.js, Vue.js, React.js, and Next.js. Paulo is passionate about creating maintainable code that can be easily comprehended and modified by fellow developers, while also prioritizing efficient and scalable architecture.
- Typescript
- Node.js
- Vue.js
- React.js
- Next.js
- HTML
- CSS
Hire Paulo
Their ability to quickly provide us with resumes of great engineers with the specific skills we needed made them an obvious choice for us. Even when we didn't need full additional engineers, Trio was more than willing to let us test out as we scale up over time.

Craig Zevin

COO at UBERDOC
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Nicolas

Senior react Developer

10 Years of Experience

Nicolas is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Nicolas
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Tomás

Senior react Developer

10 Years of Experience

Tomás is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Tomás
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Antônio

Senior react Developer

10 Years of Experience

Antônio is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Antônio
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Kaua

Senior react Developer

10 Years of Experience

Kaua is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Kaua
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Erick

Senior react Developer

10 Years of Experience

Erick is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Erick
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Luan

Senior react Developer

10 Years of Experience

Luan is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Luan
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Vitór

Senior react Developer

10 Years of Experience

Vitór is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Vitór
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Douglas

Senior react Developer

10 Years of Experience

Douglas is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Douglas
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Thiago

Senior react Developer

10 Years of Experience

Thiago is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Thiago
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Nicolas

Senior react Developer

10 Years of Experience

Nicolas is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Nicolas
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Renan

Senior react Developer

10 Years of Experience

Renan is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Renan
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally
Start Hiring
Pedro

Senior react Developer

10 Years of Experience

Pedro is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering
- react
- Javascript
- Vue.js
- Node.js
- NGX
- HTML
Hire Pedro
The team at Trio understands modern leadership/engineering which allows them to find high-quality individuals seeking opportunities to challenge themselves and develop new skills. Their engineers have the highest potential and have surpassed our expectations when taking the chance on them.

Brandon Chinn

Sr. Director of Product Engineering @ Tally

Companies trust Trio's Top-Tier React Developers to drive impact

See what some of our other partners have to say about Trio.

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Cosmos found it easier to have quality talent allocated to them through Trio.

Listen To

Mark Kimmerman

Partner

The Easiest Hire You'll Ever Make

Our senior ReactJS developers are well-rounded professionals that are passionate about building great products and delivering real impact in your company.

Excellent Communication
Deep Technical Expertise
Proven Mentoring Ability
Creative Problem Solving
Strategic Thinkers

Why Companies Choose Trio

Only Senior

100%

All Trio React Developers are senior-level with proven experience.

Speed

7 days

to fill most roles, sometimes within 3 days.

Time Saved

50+ hours

of time saved sourcing and interviewing candidates.

Retention

98%

Our engineers stay on teams for 2+ years on average

	Criteria	Trio	Internal Hiring	Marketplace
1	Time to find a senior React developer	0-3 weeks	1-4 Months	1-4 Months
2	Recruiting Fee	None	15%-40%	None
3	Quality Guarantee	Yes	No	No
4	Failure Rate	Very Low	Low	Very High
5	Pre-Screened Candidates	Yes	No	No
6	Deep Technical Validation	Yes	No	No
7	Termination Costs	None	Very high	None

Trio Senior Developer Qualifications

Role-Specific Quality

Senior React developers have a proven track record of excellent communication skills, work ethic, and impact. We match your company with senior developer talent that has extensive experience relevant to the role you're trying to fill.

Overall Quality

Beyond their excellent technical capabilities, senior React developers are also screened for English proficiency and vetted for communication and collaboration skills. We want to ensure they're amazing teammates, not just amazing workers.

Your team dynamics

Excellent Communication

Our senior developers have proven experience in their functional areas and can convey complex concepts clearly to all stakeholders.

Safe Safely

It's not about scaling fast, it's about scaling well. Trio ensures that you scale safely with talent that delivers real impact and will stick around for the long haul.

Bottom-line financials

Straightforward Pricing

Work with senior React developers full-time for a fixed hourly rate, for either 1, 3, 6, or 12-month engagements. Invoices are sent bi-weekly. No hidden fees.

Additional Savings

With Trio, you don't have to worry about benefits, vacation time, unemployment, termination hassle, paperwork, recruiting time and expenses, etc. We take care of those details.

Controllable expenses

It’s easy to scale up or downsize with Trio. No hassle involved, just good communication and advance notice as outlined in our agreement.

Team Value

Company value is largely impacted by your ability to build an amazing team and product. Hiring an amazing team of developers to build a great product takes substantial amounts of time and money.

Whether a senior React developer is hired to provide in-house teams with more bandwidth or to extend the team's capabilities, Trio enables your company to build your team and product faster.

Frequently Asked Questions

Trio's Top-Tier react developers are the highest caliber talent you will find in Latin America. They are experienced professionals who can understand your business goals and product needs and offer long-term stability to your project.

Trio provides Top-Tier React developers with the resources and training they need to continuously improve their skills over time and manage their long-term career growth.
The short answer is yes. However, realistically you will need to plan to onboard engineers effectively so we highly recommend that engineers start the week after accepting a Trio engineer in order to start fresh at the top of the week.

Our experts will support you through the entire process and learn your onboarding processes to better assist you and save time.
Trio's process is rooted in years of experience scaling and managing high-performance engineering teams. Understanding your requirements is key for us to be able to provide the right Top-Tier React developer for your team based on your current team structure and processes.

Our interview process ensures that we identify signals that align with your individual requirements and present experienced candidates with an extreme level of detail and transparency.
Working with Trio, communication is the most important value when working with our partners to make sure they are getting the value they are looking for.

You'll have access to the best Top-Tier React developers in Latin America along with some of the brightest and most passionate engineering managers to guarantee that every developer allocated to your team is happy, healthy, and exceeding your expectations.
Every Top-Tier React developer is paired with an engineering manager at no cost to you who is responsible for ensuring that their needs as well as yours are met within the context of week-to-week engineering initiatives.

These managers are not meant to replace your project or engineering managers but instead support them so they can focus on what matters most for your team, delivering new features on time.
You should look for Top-Tier React developers who have an advanced understanding of the React library, its ecosystem, and its best practices.

A Top-Tier React developer should possess a solid understanding of core concepts such as state management, component lifecycle, and the virtual DOM. They should also have experience with popular libraries and frameworks e.g Redux/Zustand, GraphQL, and Next.js.

Also, and be able to write clean, modular, and reusable components. Excellent problem-solving skills are a must along with strong attention to detail when working with designs.
React is used to build front-end user interfaces for single-page web applications and mobile apps.

It's the framework of choice for developers in the front-end community.
React is the framework of choice for many front-end developers. Aside from it being easy to learn, it provides a lot of flexibility for structuring web applications along with plenty of third-party libraries to optimize performance, manage state and more.

React's popularity has allowed it to grow and create an amazing community of developers making it easy to find and hire React developers of any seniority.

Most front-end challenges have been encountered and solved using React so finding solutions to problems is not at all difficult.

How to Find and Hire the Best Top-Tier ReactJS Developers for Your Team

ReactJS, is the hottest front-end library right now, with over ten-thousand companies using it. Whether you are building an MVP for a new product, updating a legacy codebase, or scaling your current front-end team, hiring a Top-Tier ReactJS developer is not as easy as it may seem.

If you're looking to hire Top-Tier ReactJS developers, this guide is going to give you what you need to know about hiring the right way.

ReactJS quick facts

Component-based architecture: React uses classes that encapsulate individual pieces of a user interface into larger systems.
JSX: React is able to create dynamic HTML elements that handle logic and state within the user interface.
Fast and efficient: React uses a virtual DOM to reduce the number of changes to the actual DOM.
Stable: React is backward compatible, so web-developers don't need to go through their codebase every time React releases a new version.

Why ReactJS is so popular

React's easy learning curve allowed it to be embraced quickly by the open-source community beyond Facebook, where it was originally invented and introduced.

Easy to use: React's component-based architecture allows web-developers to abstract and build complex user interfaces in an intuitive way.
Large community and ecosystem: With such a rich ecosystem of third-party libraries, tools, and resources, it's easy for web-developers to get started with React. Finding solutions to problems is much easier due to the size and engagement of the community.
Backed by Facebook: React.js was developed inside of Facebook, which had a huge part to play in its initial rise to popularity. Large companies also use React which signals to the developer community that it's worth their time and energy to work with and use in production environments.

Roles and responsibilities of a Top-Tier ReactJS developer

Top-Tier ReactJS developers are front-end JavaScript developers responsible for creating and maintaining UIs for web apps and websites. Front-end development describes software development that affects what the user sees and interacts with.

On the more technical side, Top-Tier ReactJS developers have the knowledge and expertise to handle complex front-end challenges and come up with production-grade solutions.

When it comes to soft skills, Top-Tier ReactJs developers should be ready to mentor their mid-level teammates while balancing their day-to-day work. They are expected to be strong communicators as well as thoughtful and consistent collaborators.

The first step in how to hire a Top-Tier ReactJS developer is making sure your potential hires have a proficient grasp of React's deeper technical gotchas and what's required of them for front-end development in general.

The day-to-day activities of a Top-Tier ReactJS developer can be quite diverse. Here's a snippet of what you might expect.

Developing responsive interactive technology for dynamic web pages such as menu buttons, online forms, gesture-driven actions, etc.
Testing and debugging interface software before the application goes live.
Working with the client to better understand how to manifest their vision for the app via software development.

Consulting with back-end engineers and developers to ensure that collaborative user-facing and server-side interactions run without error

The State of JavaScript Survey shows that React places highly for both usage and satisfaction.

Skills to look for in a Top-Tier ReactJS developer

To hire the best Top-Tier ReactJS developers, you'll need to evaluate them for various front-end-specific skills.

Attention to detail

There's nothing more frustrating than a front-end developer who can't translate a design into a pixel-perfect user interface. No matter how well the front end is built, if it just doesn't look good, you can guarantee that you will drive away users.

You'll want to look for web-developers who take pride in building interfaces that honor the craft and detail designers put into the UI. Components are designed at the proper ratios and micro-interactions are discussed and developed with care.

State management using Redux and Hooks

Developers must know how to build dynamic user interfaces that respond to interaction and facilitate proper data flow between components. This is done primarily through the use of Hooks and Redux. Regardless of the approach, it's crucial to understand state management in order to build scalable React JS applications.

Familiarity with Node.js

Knowledge of Node.js is not required for Top-Tier ReactJS developers however it's good to have some familiarity with Node.js to improve load times through server-side rendering and build more robust React.js applications.

Proficiency in ES6

While Top-Tier ReactJS developers should already know JavaScript and even TypeScript, they most certainly should be comfortable with ES6, specifically using high-order functions and making use of destructuring to write cleaner and clearer code.

How much does it cost to hire a Top-Tier ReactJS developer

In the United States, the average salary for a React developer across all industries is around $108,175 or $52 an hour. This data was collected from ZipRecruiter which compiles information from employer job postings and other third-party sources.

Top-Tier React developers in the United States can make upwards of $163,000 a year and beyond if they are working in big tech or Silicon Valley. This is due to the costs of living and resources that these companies have.

Many tech companies look to nearshore and offshore countries to find React developers at a lower rate. Outsourcing can be a convenient way for small and medium-sized companies (SMBs) to meet their needs while reducing operating expenditures.

Top-Tier web-developers who are based in Latin America, for instance, make about $100,000. While this is a great value considering the cost of living in South America, this is relatively inexpensive compared to developer rates in the United States. Again, the cost of living and market economics play a big role here.

Writing the best job description to hire Top-Tier ReactJS developers

The best job descriptions are straightforward with relevant details that allow candidates to validate themselves against what you're looking for. You can use the following guidelines when building your own job description to hire Top-Tier ReactJS developers.

Must-haves and nice-to-haves: Be specific about the technologies and technical skills you're looking for and what types of skills or experience you believe are nice to have for candidates to land on the shortlist.
Responsibilities: Every company has a different definition of senior or mid-level and the responsibilities that come with it based on their company size and complexity. Be clear about what their individual responsibilities will be in their day-to-day work.
What to expect in X-months: Be upfront about what you'll expect from newly hired developers in 1 month, 3 months, and 6 months. Make sure that it's reasonable.
Interview process: If you have an interview process, be transparent about it so that you can reduce candidate attrition.
Strong communication: Underrated but never understated, communication makes or breaks most developers' relationships with the teams that they work with. Better to make it explicit to candidates that communication means everything to your team and without it, they will not last long.

Interview questions to hire Top-Tier ReactJS developers

With a quality job description, you'll be spending a lot of time screening and interviewing candidates. This is the most time-intensive part of the hiring process and also the most crucial.

Everyone has their own approach to interviewing candidates, and we have ours as well. Over time, the conventions have changed based on feedback from the engineering community and also the experiences gained interviewing over 30,000 developers.

Technical interview modalities change depending on the company. Teams with high standards strongly emphasize data structure, algorithms, and systems design/knowledge questions. Others might focus more on practical knowledge with specific technologies and frameworks.

When it comes to soft skills or cultural fit, the questions that companies will ask will also vary greatly. Some will take an analytical/technical approach, while others will ask questions that are intuitive for them.

There's no right or wrong, only strong or weak signals.

In this section, we'll focus specifically on technical questions geared towards Top-Tier ReactJS developers, for a more comprehensive deep-dive on soft-skills interviews check out the guide here.

Keep in mind that a candidate's ability to answer questions does not deliver strong signals about their overall ability to perform well on your team. It simply shows you that they might be able to code their way out of a paper bag with the technology you testing for.

Advanced react.js concepts

Is there a way to cancel an API request inside a useEffect?

Yes, there is a way to do this by using AbortController:


useEffect(() => {
  const controller = new AbortController();
  const signal = controller.signal;
              
  fetch('your-api-url', { signal })
    .then(res => res.json())
    .then(res => setData(res))
    .catch(error => {
      if (error.name !== 'AbortError') {
        console.error(error.message);
      }
    }
  );

  return () => controller.abort();
}, []);

The following code doesn't preserve the component state when isFavorite changes, how can you prevent/fix this?


import { useState } from 'react';

export default function App() {
  const [isFavorite, setIsFavorite] = useState(false);
  
  if (isFavorite) {
    return (
      <div>
        <Component isFavorite={true} />
      </div>
    );
  }

  return (
    <div>
      <Component isFavorite={false} />
    </div>
  );
}

function Component({ isFavorite }) {
  const [number, setNumber] = useState(0);

  let className = 'number';
  
  if (isFavorite) {
    className += ' isFavorite';
  }
  return (
    <div className={className}>
      <button onClick={() => setNumber(number + 1)}>
        +
      </button>
    </div>
  );
}

When a component is rendered, the state is preserved as long as it's still in the UI tree. Issues can occur if the component is unmounted and then remounted somewhere else in the tree, and the state will be lost.

To prevent this, render the component within the same parent div to ensure that the state is preserved even if moved around in the UI tree. This way, the component can be safely unmounted and remounted without losing its state.


export default function App() {
const [isFavorite, setIsFavorite] = useState(false);

return (
  <div>
    <Component isFavorite={isFavorite} />
  </div>
);
}

For more interview questions for Top-Tier ReactJS developers, check out our Interview Questions page.

Why use ReactJS in your application

The user interface is the center point of an end user's experience with an app.

Whether it's a web or mobile application, which visual library you use to power it is important. It's been an age-old debate for years, React vs. Angular vs. Vue, with companies using one or the other.

According to the numbers, the battle for superiority has already been won by React. Let's figure out why by breaking down a few of the advantages of React.js so you can determine whether or not you want to implement it as your new front-end technology.

ReactJS is a visual library for JavaScript created by Facebook to power UI's that are reactive and reflective of each user's individual experience within an app.

Designed to accommodate apps that are highly personalized experiences, it makes complete sense that a company like Facebook which owns some of the largest personalized social networks and communication tools would create something like React.

By dynamically changing the app's UI based on the data that a user inputs, React JS stands out as the ideal choice as a visual library for your project if it has functions and features such as user profiles, curated content, or customizable interfaces.

The way React prioritizes dynamic experiences makes it stand out as an ideal choice if User-Experience (UX) is something you are trying to prioritize with your app.

UX is increasingly becoming one of those things that make or break your app in an industry as competitive as tech, so considering it heavily during your development is vital.

ReactJS has been noted for being a lot more user-friendly from a development angle. It utilizes a Virtual DOM as opposed to a Real DOM, making updating apps and testing performance a lot more approachable for web-developers.

By making it easy to reuse code in different parts of your development environment, user interfaces can be designed and programmed in a way that favors quick-development, saving lots of time for other aspects of development.

The way React.js is designed allows it to be much more stable than other visual libraries, removing many of the headaches from front-end development.

The ability to quickly deploy dynamic user interfaces in a way that considers both the end-user and web-developers makes React.js a well-rounded choice for powering your front-end development.

Hire Top-Tier ReactJS Developers - Final Thoughts

Hiring Top-Tier ReactJS developers isn't easy and will take a considerable amount of your time. Time is not a luxury and as an engineering leader, you will most likely need to balance your work week between optimizing processes and hiring. That type of context switching is not recommended when better alternatives exist to find talent.

More importantly, making the wrong hire is expensive both in time and cost.

To offload the hiring process, rapidly speed up your time-to-hire, and mitigate risk, reach out to us at Trio . Our 3-step interview process was designed specifically to capture senior-level technical and soft-skill signals and hire the right Top-Tier ReactJS developers for your team.

With Trio, you can focus on what you love most - deliver great products while we handpick and shortlist from our pre-vetted talent network. We'll enable payroll, benefits, taxes, and local compliance and support you with onboarding and long-term talent management.

Happy hiring! :)

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