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React is a JavaScript library for building user interfaces using reusable components and reactive data binding. Developed by Meta and released in 2013, it's become the dominant frontend framework globally. Over 240,000 GitHub stars and millions of weekly npm downloads reflect its dominance. Companies like Netflix, Airbnb, Uber, and nearly every SaaS platform rely on React for web applications.
React's core innovation is the component model: instead of manipulating the DOM directly, you build declarative components that describe how the UI should look given some state. React handles rendering efficiently through the virtual DOM. The ecosystem is mature: Next.js handles server-side rendering and full-stack applications, React Router handles client-side navigation, and thousands of component libraries exist for UI, forms, data tables, and specialized domains.
React dominates frontend development because it's relatively simple to learn, scales well for large applications, and attracts the most developer talent. The tradeoff: the ecosystem is fragmented (routing, state management, form handling all have multiple solutions), and you need strong JavaScript skills to use it well. For simple web applications, vanilla JavaScript or Svelte might be lighter. For native mobile apps, React Native covers iOS and Android from one codebase.
Hire React developers when you're building web applications that need to handle complex state, real-time updates, or interactive experiences. This covers 90% of modern web startups and businesses. React is the default choice for SaaS platforms, dashboards, content platforms, and consumer web applications.
For LatAm talent, React is a particular advantage. Brazil and Argentina have massive React communities and strong talent pools. React dominates across LatAm tech companies, making it easier to find experienced developers and easier to grow your LatAm team as it scales. This is one of the largest talent pools in Latin America.
Do NOT hire a React developer if you're building a simple static website or content blog. Plain HTML, CSS, and vanilla JavaScript are faster and lighter. Do NOT hire pure React experts if you need full-stack capability; look for Next.js specialists instead. Do NOT hire junior React developers for critical systems without senior oversight; React's flexibility can produce unmaintainable code in inexperienced hands.
Team composition: One senior React developer can architect and code-review for 3-5 mid-level developers. If you're building a large application, separate frontend and backend teams; React developers should focus on the UI layer. If you're small, hire full-stack developers comfortable with React on the frontend and Node.js/Python/Java on the backend.
Must-haves: 2+ years hands-on React experience (not tutorials, actual shipped code in production). Deep understanding of components, hooks, state management, and asynchronous patterns. Familiarity with modern JavaScript (ES6+, promises, async/await). Experience with npm/package management and build tools. Understanding of React performance (memoization, code splitting, lazy loading).
Nice-to-haves: Next.js experience (increasingly expected for new hires). TypeScript for type-safe React. Testing libraries (Jest, React Testing Library). Knowledge of CSS-in-JS or CSS modules. GraphQL or API integration experience. Understanding of SEO for client-side rendering. Experience with React Native (same mental model, different platform). Familiarity with component libraries and design systems.
Red flags: Claims to know React but can't explain hooks or component lifecycle. Limited portfolio or personal projects. Treating React as a template language instead of understanding components and state. Can't talk about performance or bundle size. "jQuery" mindset applied to React (DOM manipulation instead of state-driven). No experience with production debugging or monitoring.
Junior vs. Mid vs. Senior: Juniors (0-2 years) can build simple components and integrate with APIs under supervision. Mid-level (2-5 years) can architect feature-level systems, make performance decisions, and mentor juniors. Senior (5+ years) can design entire applications, scale teams, mentor multiple levels, and make technology choices (React vs. alternatives, state management, testing strategy).
Differentiator for LatAm hiring: Look for Next.js experience as a senior differentiator. Most mid-level LatAm React developers know React. Seniors who understand Next.js (server-side rendering, static generation, API routes, full-stack patterns) are more valuable and rarer. Many LatAm developers are strong in React UI but weaker in backend integration; test this explicitly.
Remote work essentials: Strong async communication. Ability to explain code decisions in written form (code reviews, pull requests). Self-directed learning (React ecosystem changes fast). Comfortable with timezone differences if you're US-based hiring LatAm; 6-8 hours of overlap is sufficient for React work. English at B2 minimum for code conversations and code review feedback.
Behavioral Questions (South's vetting process):
Technical Questions:
Practical Assessment:
Build-a-todo-app is overdone. Instead: "Build a React component that displays a paginated list of users fetched from an API, with search filtering and sorting. Include error states, loading states, and handle network failures gracefully." Time: 3-4 hours. They should deliver working code with: proper async handling, error boundaries, loading states, efficient rendering (no unnecessary re-renders), basic styling, and clear component structure. Scoring: Functionality (25%), code organization (25%), async handling (20%), performance awareness (15%), testing/documentation (15%).
LatAm Market Rates (2026):
US Market Rates (for comparison):
Country-specific variations: Brazil (São Paulo, Rio) has the largest talent pool with rates 5-15% higher than Argentina/Mexico due to demand. Argentina and Mexico offer best value for senior talent. Colombia competitive with Mexico for mid-level. Tier-1 cities command 15-25% premiums over tier-2 locations.
Next.js premium: Full-stack React developers with strong Next.js experience command 15-25% premium over pure React developers in LatAm. This is the market trend as Next.js adoption accelerates.
What you're paying for: Not just coding ability. The gap from junior to senior React is: architectural thinking (how to structure large apps), performance intuition (bundle size, rendering efficiency), ecosystem knowledge (which tools/libraries to use), team scaling ability (mentoring and code review), and debugging expertise. A senior React developer is 3-5x more productive than a junior on complex systems.
Massive talent pool. React dominates LatAm frontend development. Brazil and Argentina have exceptional React communities. When you say "hire a frontend developer" in LatAm, React is the default. This scale means you can find quality developers and grow your team sustainably without talent bottlenecks. The same is not true for more niche skills.
Timezone alignment is excellent. LatAm spans UTC-3 (Argentina) to UTC-5 (Mexico/Colombia), giving you 6-8 hours of business day overlap with US EST. This matters for React because it's often collaborative (code review, pair programming, synchronous debugging). A developer in LatAm can work with your US team in real-time, unlike Asia-based developers.
English proficiency among LatAm React developers is solid to excellent. This is code-heavy work where communication is through pull requests, documentation, and async code review. A LatAm developer with B2 English can absolutely own this. Many have worked remote-first with US companies before and understand async expectations.
Cost efficiency is real. You're looking at 35-45% savings compared to US rates. Hire a senior LatAm React developer instead of a mid-level US hire for the same budget. The organizational impact is identical; you're building the same features with better cost structure.
Cultural alignment with remote-first work. LatAm tech talent is accustomed to distributed teams, async collaboration, and timezone navigation. They expect clear documentation (pull request descriptions, code comments) and can work independently. Many grew up in startups that were remote-first by necessity.
Start your search for a React developer today.
React is the safest bet for most web applications. You get the largest community, most libraries, most developers, and longest job security. Vue and Svelte are lighter and faster to learn but have smaller ecosystems. Angular is overkill for most teams. For a new project with a distributed team, React is default.
Pure React (client-side rendering) is bad for SEO because search bots can't index dynamically rendered content. Next.js solves this with server-side rendering and static generation. If SEO matters (content sites, blogs, landing pages), use Next.js instead of plain React. For SaaS dashboards and applications behind login, SEO doesn't matter.
Yes, if your team has 5+ developers or your codebase will live 3+ years. TypeScript catches errors at development time, improves code navigation, and enforces better structure. The upfront cost (learning curve, slower initial development) pays off in maintenance and team scaling. For small teams or short-term projects, vanilla JavaScript is fine.
Start with React Context API (hooks, local component state). Only move to Redux, Zustand, or Jotai if Context becomes a bottleneck (deeply nested components, frequent updates, complex state logic). Most teams over-engineer state management. Keep it simple until you prove you need complexity.
Feature-based folder structure (not layer-based). Organize by feature (user/account/settings) not by type (components/containers/redux). Each feature is self-contained. Scale this by enforcing clear boundaries between features and preventing cross-feature dependencies. A good React developer will enforce this structure and prevent spaghetti code.
If you're building iOS and Android from one React codebase, yes. If you only need iOS, native Swift is better. If you only need Android, native Kotlin is better. React Native is a compromise that works if you need cross-platform. It's not ideal for either platform, but it's efficient for teams.
WebSockets for truly real-time (< 100ms latency). GraphQL subscriptions if you're using GraphQL. Polling for simple cases where 5-10 second delay is acceptable. Server-Sent Events for one-way server-to-client updates. Choose based on latency requirements, not hype.
Unit tests for logic-heavy components (state machines, calculations). Integration tests for feature-level flows (user interactions). End-to-end tests for critical paths (signup, payment, core feature). Don't aim for high code coverage; aim for high-risk coverage. A good React developer knows the difference.
Code splitting (lazy loading routes, dynamic imports for heavy components). Tree shaking (removing dead code). Analyzing bundle size with tools like bundle analyzer. Choosing lightweight libraries. A good React developer thinks about bundle size and makes optimization decisions early, not after the app is slow.
Yes for most teams. React ecosystem is mature, documentation is excellent, talent is abundant, and it scales from startup to enterprise. Newer frameworks like Solid or Fresh have advantages in specific cases (bundle size, server-rendering architecture), but React's ecosystem advantage and talent pool make it the default for new projects. Pick React unless you have a specific constraint (bundle size critical, server-rendering emphasis, etc.).
Gradual migration, not big bang. Convert one page or feature at a time. Keep jQuery running while React takes over new code. This is a mid-to-senior developer task; it requires understanding both systems and maintaining stability during transition. Plan for 2-3 months minimum for a moderate-sized app.
React is a library for building components. Next.js is a full-stack framework built on React that adds routing, server-side rendering, API routes, and deployment. Use React if you just need a frontend (your backend is separate). Use Next.js if you want a full-stack JavaScript application or need server-side rendering for SEO.
React Hook Form or Formik for complex forms (validation, field dependencies, async submission). Controlled components (useState) for simple forms. Libraries handle validation, error display, and submission logic. Don't build your own form library; the third-party options are mature and better than anything you'll write.
Next.js | TypeScript | Node.js | JavaScript | Vue.js
