Trio focuses on finding the best JavaScript 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.
Tuily
JavaScript Developer
9 Years of Experience
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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.
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Marcelo
JavaScript Developer
10 Years of Experience
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Marcelo is a specialist in mobile development with Javascript/Typescript, React Native, Java, and other related technologies. He holds a Bachelor’s Degree in Computer Science and has experience working in small and big-sized companies building different types of apps.
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Francisco
JavaScript Developer
6 Years of Experience
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Francisco is passionate about creating maintainable code that can be easily comprehended and modified by fellow developers, while also prioritizing efficient and scalable architecture.
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Sergio
JavaScript Developer
8 Years of Experience
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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.
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Trusted by great folks at
Why
How
What
All Trio React Developers are senior-level with proven experience.
to fill most roles, sometimes within 3 days.
of time saved sourcing and interviewing candidates.
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 |
A Trio Partner Experience Manager will work closely with you to understand your technical needs and gather detailed information about your current team and
Once our team has identified strong candidates that fit your team based on the details we gathered, we’ll present a list of senior ReactJS developer profiles for your project.
Trio developer profiles are extremely detailed and transparent in order to save you time evaluating candidates. You’ll still be able to screen candidates before hiring if you wish.
As soon you review and sign off on a senior React developer, our team will work with you to onboard and manage them for the duration of their tenure.
Our team is committed to delivering excellence as a plug-and-play engineering department that provides long-term stability and generates a positive impact to our partners.
Trio provides only the best senior React developers in Latin America across the most popular and stable web technologies. We focus on building processes that allow us to source, identify and manage senior developers that integrate and deliver real impact to your company.
Unlike freelance developers who do not feel the need to be committed to a team beyond their tasks, Trio’s senior React developers integrate on a full-time basis and are dedicated to working with your team for the long haul. They collaborate in meaningful ways and understand how their work ties into the big picture.
Our core strength lies in our ability to enhance your current teams with senior developers who have the experience and capabilities to drive your roadmap forward in a way that less experienced developers simply cannot do.
Trio operates primarily in Latin America which shares favorable time-zone alignments across the entire United States. You’ll be able to collaborate easier with senior React developers that are available when you are, and eager to work with you remotely.
Trio’s senior JavaScript developers stand out with their extensive experience and expertise. They possess a deep understanding of your business goals and product requirements, offering long-term stability to your projects.
Trio goes the extra mile by equipping senior JavaScript developers with necessary resources and continuous training, ensuring their skills evolve and their careers flourish over time.
Absolutely! While it’s important to plan for an effective onboarding process, Trio can provide you with senior JavaScript developers in less than 5 days.
We recommend engineers start the week after accepting an offer from Trio, allowing them to begin fresh at the start of the week. Our expert team will support you throughout, familiarizing themselves with your onboarding processes to save you valuable time.
Trio’s process is built on years of experience in scaling and managing high-performance engineering teams. We prioritize understanding your unique requirements to ensure we match you with the perfect senior JavaScript developer for your team.
Our meticulous interview process is designed to identify candidates who align with your specific needs. With careful attention to detail and transparency, we present experienced candidates who truly meet your expectations.
Working with Trio embodies the essence of collaboration. Communication is our top priority, as we believe in delivering the utmost value to our partners. With Trio, you gain access to the finest senior JavaScript developers.
Our engineering managers are among the brightest and most passionate professionals in the field. They ensure that each developer assigned to your team is not only happy and healthy but consistently exceeds your expectations.
Absolutely! Trio understands the importance of dedicated support. Every senior JavaScript developer is paired with an engineering manager at no additional cost. These managers take responsibility for meeting the developers’ needs and your team’s objectives on a week-to-week basis.
While they support your project and engineering managers, their primary goal is to enable your team to focus on what truly matters – delivering new features on time.
When seeking a senior JavaScript developer, look for individuals who possess an advanced understanding of the JavaScript language and its ecosystem. They should be well-versed in best practices and have a solid grasp of core concepts such as object-oriented programming, asynchronous programming, and DOM manipulation. It’s also crucial to consider their experience with popular frameworks like React, Angular, or Vue.
Look for developers who can write clean, modular, and maintainable code. Strong problem-solving skills and attention to detail when implementing complex logic are qualities that should not be overlooked.
JavaScript is a versatile programming language used for web development. It allows you to create dynamic and interactive elements on websites, handle client-side and server-side scripting, build web applications, and even develop mobile applications using frameworks like React Native.
JavaScript is a popular choice for web development due to its widespread adoption, extensive ecosystem, and versatility. It enables you to create interactive user interfaces, handle data manipulation and validation, and perform asynchronous operations seamlessly.
With frameworks like React, Angular, or Vue, JavaScript empowers developers to build scalable and responsive web applications. Additionally, JavaScript’s active developer community provides access to abundant resources and libraries, making it easier to stay updated with the latest web development trends.
With Trio you will find the best and most experienced developers for nearshore outsource.
The level of quality that Trio brings to our team is unmatched. We've worked with lots of different technology vendors, and no one else has been able to provide the same quality of work, while also working within our startup budget, that Trio has.
Brianna Socci
Co-Founder & COO of UBERDOC
Trio understands modern 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
Trio is able to match us with the exact front-end and back-end developers we need. There's never been something we wanted that Trio wasn't able to deliver via their team. Their communication is excellent. They're prompt, clear, and highly available.
Meridith Harold
Founder & CEO of The Informed SLP
Trio's team has been outstanding when communicating with our team. We've worked with several of Trio's developers and each one was closely involved in all operations of our business, beyond just technological development.
Alec Harrison
Co-Founder of Visual Boston
Simple and easy. Always made themselves available. When questions would arise, documented options would be presented with pros and cons of each option. Made it very easy to work through issues.
Brian Kludas
VP of Client Success @ Axiom Sales Kinetics
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.
Expertise
JavaScript
Node.js
React
CSS
Vue.js
In the rapidly evolving world of web development, hiring the best senior JavaScript developers for your team is essential. These seasoned professionals possess the expertise and experience to drive your projects forward, ensuring success and innovation.
Finding and attracting top talent in the highly competitive landscape of JavaScript development can be challenging, if not time-consuming. Even though talent wars are largely a thing of the past, hiring is fraught with challenges and the risk of time/resources wasted on a bad hire.
In this article, we will explore the importance of hiring senior Java developers, discuss the challenges involved in the process, and provide you with a comprehensive guide on how to find and hire the best senior JavaScript developers for your team.
And if you’re interested in exploring faster and smarter ways to scale your team, look no further than Trio to be the tech partner behind your business’s continued growth and success.
Before diving into the details of hiring senior JavaScript developers, let’s take a moment to consider some quick facts about JavaScript that engineering leaders should be aware of:
Understanding these fundamental aspects of JavaScript will help engineering leaders make informed decisions regarding their technology stack and the type of developers they need for their teams.
When searching for senior JavaScript developers, it is crucial to distinguish between skills and roles. While skills refer to specific proficiencies, roles encompass the broader responsibilities and contributions that senior developers fulfill. Here are some key roles and responsibilities to consider when hiring senior JavaScript developers:
By understanding these roles and responsibilities, you can better assess candidates and ensure they align with the needs and goals of your team.
When evaluating senior JavaScript developers, it is essential to consider their proficiency in both front-end and back-end development. Here are some key skills to look for:
Front-end Skills:
Back-end Skills:
Finding candidates who specialize in one or possess a balance of front-end and back-end skills will allow your team to tackle a wide range of development tasks effectively.
When considering the cost of hiring senior JavaScript developers, several factors come into play. The location, experience level, and demand for skilled JavaScript developers in the market all contribute to the overall cost.
Additionally, experience level plays a role, with more experienced developers commanding higher salaries. It is crucial to align your budget with the expectations of the candidates and the market rates to attract and retain top talent.
Crafting a compelling job description is paramount to attract the right candidates for your senior JavaScript developer positions. Here are some key elements to include:
Conducting effective interviews is crucial to assess candidates’ technical skills and overall fit for your team. Here are a few examples of advanced JavaScript interview questions you can ask senior candidates:
Can you explain the event loop in JavaScript and how it handles asynchronous operations?
The event loop is a crucial concept in JavaScript that allows for the handling of asynchronous operations. In JavaScript, code execution follows a single-threaded model, meaning that it processes one task at a time.
However, JavaScript also supports non-blocking operations, such as fetching data from an API or executing a callback function.
It’s responsible for managing these asynchronous operations by continuously monitoring the call stack and the task queue. When an asynchronous operation, like a network request, is initiated, it is offloaded to a separate thread, often provided by the browser or runtime environment. Once the operation completes, it is placed in the task queue.
The event loop also checks if the call stack is empty. If it is, it takes the next task from the queue and pushes it onto the call stack for execution. This process ensures that the JavaScript engine remains responsive and can handle concurrent operations without blocking the main thread.
How would you optimize the performance of a React application?
Optimizing the performance of a React application is essential to ensure a smooth user experience. Here are some techniques to consider:
1
Minimize Render Operations: React’s reconciliation algorithm compares the current virtual DOM with the previous one to determine necessary updates. Minimizing unnecessary renders by using pure components, memoization, or shouldComponentUpdate can improve performance.
2
Virtualize Long Lists: Rendering long lists can be resource-intensive. Virtualization techniques like windowing or infinite scrolling can render only the visible elements, reducing the rendering overhead.
3
Code Splitting and Lazy Loading: Splitting your code into smaller chunks and loading them only when needed can improve initial load times. React provides features like React.lazy and React.Suspense to enable code splitting and lazy loading.
4
Optimize Images: Compressing and properly sizing images can significantly reduce the application’s overall size and loading times. Consider using responsive image techniques or lazy-loading images that are outside the initial viewport.
5
Memoize Expensive Computations: Memoization can help avoid redundant computations by caching the results of expensive function calls. Libraries like Reselect can be used to implement memoization in React applications.
6
Use Production Builds: When deploying your application, ensure that you are using production builds of React. These builds have optimizations, such as minification and dead code elimination, that improve performance.
Describe the concept of closures in JavaScript and provide a practical use case.
In JavaScript, closures are created when a function is defined within another function and has access to the outer function’s variables and scope, even after the outer function has finished executing. The inner function “closes” over the variables it references, creating a closure.
A practical use case of closures is in implementing data privacy or encapsulation. By using closures, you can create private variables and methods that are inaccessible from outside the function but can still be accessed and modified by the inner functions within the closure.
For example, consider a counter function that returns an object with two methods: increment and getCount. The counter function encapsulates the count variable within its closure, making it private and inaccessible from the outside.
Is there a way to cancel an API request inside a useEffect?
Yes, there is a way to do this by using AbortController:
function counter() {
let count = 0;
function increment() {
count++;
}
function getCount() {
return count;
}
return {
increment,
getCount,
};
}
const myCounter = counter();
myCounter.increment();
console.log(myCounter.getCount()); // Output: 1
In this example, the count variable is not directly accessible from outside the counter function. However, the inner functions increment and getCount have access to it due to the closure. This allows us to maintain and manipulate the count variable while keeping it private from the rest of the program.
Can you explain the differences between prototypal and classical inheritance in JavaScript?
JavaScript is based on a prototypal inheritance model rather than the classical inheritance model found in languages like Java or C++. Here are the key differences:
How would you optimize the performance of a React application?
Optimizing the performance of a React application is essential to ensure a smooth user experience. Here are some techniques to consider:
Describe the concept of closures in JavaScript and provide a practical use case.
In JavaScript, closures are created when a function is defined within another function and has access to the outer function’s variables and scope, even after the outer function has finished executing. The inner function “closes” over the variables it references, creating a closure.
A practical use case of closures is in implementing data privacy or encapsulation. By using closures, you can create private variables and methods that are inaccessible from outside the function but can still be accessed and modified by the inner functions within the closure.
For example, consider a counter function that returns an object with two methods: increment and getCount. The counter function encapsulates the count variable within its closure, making it private and inaccessible from the outside.
function counter() {
let count = 0;
function increment() {
count++;
}
function getCount() {
return count;
}
return {
increment,
getCount,
};
}
const myCounter = counter();
myCounter.increment();
console.log(myCounter.getCount()); // Output: 1
In this example, the count variable is not directly accessible from outside the counter function. However, the inner functions increment and getCount have access to it due to the closure. This allows us to maintain and manipulate the count variable while keeping it private from the rest of the program.
Can you explain the differences between prototypal and classical inheritance in JavaScript?
JavaScript is based on a prototypal inheritance model rather than the classical inheritance model found in languages like Java or C++. Here are the key differences:
Cross-Site Scripting (XSS) vulnerabilities can pose serious security risks in web applications. To mitigate XSS vulnerabilities, you can implement the following security measures:
These questions will help you gauge a candidate’s depth of knowledge, problem-solving abilities, and capacity to handle real-world scenarios.
JavaScript’s widespread adoption and versatility make it an ideal choice for web application development. Here are some compelling reasons to use JavaScript in your applications:
JavaScript is supported by all major web browsers, ensuring broad compatibility for your applications. It allows you to deliver a consistent user experience across different platforms.
JavaScript boasts a vast ecosystem of frameworks, libraries, and tools that accelerate development and provide robust solutions for various requirements. Whether you need to build a single-page application with React or develop server-side logic with Node.js, JavaScript offers a wide range of options.
JavaScript can be used for both front-end and back-end development, allowing for seamless integration and code reuse. This eliminates the need to switch between different programming languages, simplifying development and enhancing productivity.
JavaScript has a large and active developer community, providing resources, documentation, and community-driven support. The availability of tutorials, forums, and open-source projects ensures that developers have access to the collective knowledge and experience of the community.
JavaScript evolves rapidly, with regular updates and new features. This enables developers to leverage the latest advancements in web development, stay current with industry trends, and build modern and innovative applications.
By leveraging JavaScript in your application, you can harness its power to deliver exceptional user experiences and drive innovation.
Finding and hiring the best senior JavaScript developers for your team is a critical step toward building successful web applications. By understanding the importance of hiring senior developers, the challenges involved in the process, and the roles and responsibilities they fulfill, you can streamline your recruitment efforts.
Considering the essential skills, writing compelling job descriptions, conducting effective interviews, and understanding the value of JavaScript in your applications will empower you to attract and retain top talent.
With the right senior JavaScript developers on board, your team will be well-equipped to tackle complex projects, drive innovation, and achieve remarkable results.
Making the wrong hire can prove to be costly in terms of both time and resources.
To streamline the hiring process, accelerate your time-to-hire, and minimize risks, consider partnering with us at Trio. Our three-step interview process is specifically designed to identify senior-level technical expertise and assess soft skills, enabling us to connect you with the right senior React Native developers for your team.
With Trio, you can focus on what you do best – delivering exceptional products – while we handpick and shortlist candidates from our pre-vetted talent network. We take care of payroll, benefits, taxes, local compliance, and provide support for onboarding and long-term talent management.
Happy hiring and building great JavaScript applications! 🙂
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