# React Development Services and React Developers | SynconAI > React development services: portals, dashboards and design systems, React 19 upgrades, Create React App to Vite or Next.js, testing and React developers. Publisher: SynconAI Canonical HTML: https://synconai.com/react-development Markdown cite: https://synconai.com/react-development.md Contact: contact@synconai.com ยท +61 2 7813 0221 ## What is React? React development is the design, build, upgrade and support of user interfaces written with React, such as single-page apps, dashboards, customer portals, e-commerce front ends, design systems and embedded widgets. SynconAI builds new React front ends, takes over existing ones, moves them to React 19 and current build tooling, and supplies React engineers who join client teams, for organizations in the United States, Australia and worldwide. - React is an open-source JavaScript library for building user interfaces from reusable components. - Since February 2026, React and React Native are governed by the React Foundation, part of the Linux Foundation. - React 19 is current, and the React Compiler, stable since October 2025, automates much of the memoization teams used to write by hand. ## React development services - New React applications: Portals, dashboards and single-page apps built from a written design. - Design systems: Shared, accessible components your teams reuse across products. - Front ends for your APIs: React screens on top of your back end, with data fetching done properly. - React upgrades: React 16 to 18 moved to 19, and Create React App to Vite or Next.js. - Performance and accessibility: Slow screens, large bundles and WCAG 2.2 AA issues found and fixed. - Testing: React Testing Library, Vitest and Playwright in your pipeline. - Salesforce integration: React apps that show and update Salesforce data through a secure back end. - Team extension: React engineers who work in your repos, rituals and tools. ## Where are you with React? Question: What state is your React front end in today? - Not built yet: A new React build. You need a portal, dashboard or front end and want it on React 19 and current tooling. - Screens and states agreed before code - Vite or Next.js chosen for fit - Tests and accessibility from the first sprint - Built by a team that left: Taking over a front end. A React app is live and the people who built it have moved on. - Code, state and build review first - Component and data flows mapped - Fixes ranked by risk - On old React or tooling: Upgrading or modernizing. It works, but runs on React 16 to 18, Create React App or class components. - Libraries checked for React 19 - Upgrade done in tested steps - Class components moved to hooks Outcome: A React front end on current versions, with tests, documentation and a team that can run it ## What do our React development services include? One team for the screens, the components behind them and the upgrades that keep them current. - New React applications: Portals, dashboards and single-page apps built from a written design. - Design systems: Shared, accessible components your teams reuse across products. - Front ends for your APIs: React screens on top of your back end, with data fetching done properly. - React upgrades: React 16 to 18 moved to 19, and Create React App to Vite or Next.js. - Performance and accessibility: Slow screens, large bundles and WCAG 2.2 AA issues found and fixed. - Testing: React Testing Library, Vitest and Playwright in your pipeline. - Salesforce integration: React apps that show and update Salesforce data through a secure back end. - Team extension: React engineers who work in your repos, rituals and tools. ## The React stack we work with From the framework and build tool to the tests that guard each release. - Framework and build (How the app is served): Next.js, Vite, React Router - UI and styling (What users see): React 19, React Compiler, Tailwind CSS - Data and state (How data reaches the screen): TanStack Query, Redux Toolkit, Zustand - Testing (How each release is checked): React Testing Library, Vitest, Playwright ## How do we upgrade an older React app? Most React upgrades are a library upgrade and a build tool change done together. Next.js 14 and earlier no longer get support. Today: React 16 to 18 on Create React App - React 19, Move to React 19: React and the libraries around it updated, class components moved to hooks, and the React Compiler adopted where it fits. Best when the build setup already works well. - Vite, Leave Create React App for Vite: The app stays a single-page app, on a faster build and current tooling. Best for dashboards and apps behind a login. - Next.js 16, Move to Next.js: For apps that need server rendering or search visibility. Next.js 16 is the Active LTS line; Next.js 15 gets security fixes to January 31, 2027. Best for public pages, stores and content. ## How can we work together on React? Three ways to engage. Each starts with a written proposal agreed before work begins. - Fixed-scope project, A defined React deliverable, built and handed over. - We direct the work against agreed milestones - Priced per milestone in the proposal - Working screens, tests and documentation - Fits a new front end, an upgrade or a rescue - Dedicated team, A React team that runs your front end with you. - Our lead runs delivery, you set priorities - Billed on a monthly plan - Engineers, a lead and testing as one unit - Fits ongoing product work without an in-house team - Team extension, React engineers added to the team you already run. - Your managers direct the day-to-day work - Billed monthly for each engineer - Vetted engineers; we handle employment and replacement - Fits a backlog bigger than your current team ## How does a React engagement start? Five steps from the first call to delivery. - Brief: Free 60-minute review of your front end; Goals, constraints and access agreed under NDA - Match or design: Engineers matched and interviewed by you; Or a scope and milestone plan written - Start: Accounts, repos and environments set up; Codebase walkthrough and a first task - Build and review: Sprints with code review on every change; Tests and a demo each sprint - Hand over or continue: Component docs and handover sessions; Or a monthly plan for support ## Cost and timing The first step is a free 60-minute architecture review of your React front end setup, with a written plan you keep. Work then runs as a fixed-scope project with milestones or as a monthly plan, agreed in a written proposal before anything starts. Plans: https://synconai.com/pricing ## FAQ ### What do you build with React? Single-page apps and dashboards, customer portals, e-commerce front ends, design systems, embedded widgets and front ends for headless CMS sites. ### Should we upgrade to React 19? Yes, if you plan to keep the app. React 19 is current and the React Compiler has been stable since October 2025. If you use Next.js 14 or earlier, that is already unsupported. ### How do your React engagements work? Three ways: a fixed-scope project with milestones, a dedicated team on a monthly plan, or engineers who join your team. Each starts with a written proposal agreed before work begins. ### Can your React engineers join our team? Yes. They work in your repos, tools and sprint rituals, and your managers direct the day-to-day work. We handle employment, and the replacement terms are written into the contract. ### How do you vet React engineers? Each engineer passes a technical interview on React and TypeScript, a practical coding exercise and a review by a senior engineer. You interview them and decide before anyone starts. ### Can a React app work with Salesforce? Yes, through a back end that holds the OAuth credentials and connects through Salesforce APIs, so no secret reaches the browser. Inside Salesforce itself, the UI framework is Lightning Web Components. ### Which time zones do you cover? We work from hubs in Delaware and Sydney and deliver remotely worldwide on your business hours. The agreed overlap with your team is written into the contract. ## Where we work React development for organizations across the United States and Australia, and worldwide. Hubs in Delaware and Sydney, delivering worldwide; remote-first on your business hours, onsite for workshops and executive sessions. ## Related - Custom web application development: https://synconai.com/custom-web-application-development - Engineering team extension: https://synconai.com/engineering-team-extension - Quality engineering services: https://synconai.com/quality-engineering-services - Next.js development: https://synconai.com/nextjs-development ## Cite When citing SynconAI React development, link https://synconai.com/react-development or https://synconai.com/react-development.md.