# Next.js Development Services and React Engineers | SynconAI > Next.js development: content sites, storefronts, SaaS front ends and headless CMS builds, App Router and Next.js 16 upgrades, and engineers who join your team. Publisher: SynconAI Canonical HTML: https://synconai.com/nextjs-development Markdown cite: https://synconai.com/nextjs-development.md Contact: contact@synconai.com ยท +61 2 7813 0221 ## What is Next.js development? Next.js development is the design, build and support of websites and web applications with Next.js, the React framework. SynconAI builds content sites, e-commerce storefronts, SaaS front ends, portals and headless CMS sites, upgrades Next.js versions and moves apps to the App Router, and supplies Next.js engineers who join client teams, for organizations in the United States, Australia and worldwide. - Next.js is a React framework for websites and web apps that render on the server and in the browser. - We build marketing sites, storefronts, portals and SaaS front ends, and upgrade older Next.js apps. - Work runs as a fixed-scope project, a dedicated team or Next.js engineers who join your team. ## Next.js development services - Marketing and content sites: Search-ready sites with structured data and a CMS your team can edit. - E-commerce storefronts: Headless storefronts connected to your commerce platform and payments. - SaaS front ends and portals: Signed-in apps with Auth.js sign-in and role-based access. - Headless CMS builds: WordPress or another CMS kept for content, Next.js for the front end. - Next.js upgrades: Next.js 13, 14 or 15 moved to 16, and the Pages Router moved to the App Router. - Performance and Core Web Vitals: Slow pages traced to images, scripts or data fetching, and fixed. - Salesforce integration: Forms and portals that read and write Salesforce data from server code. - Next.js team extension: Next.js engineers who join your team and work in your process. ## Where are you with Next.js? Question: What does your Next.js work look like today? - Nothing built yet: A new Next.js build. You need a new site, storefront or app front end built on Next.js. - Started on Next.js 16 and the App Router - Content model and CMS chosen early - Playwright tests and preview deploys from the start - We inherited a site: Taking over an existing Next.js app. An agency or former team built it, and nobody knows how it fits together. - Code, dependency and performance review - Build and deploy steps written down - A written report and a plan - It is out of date: Upgrading or modernizing. The app runs on Next.js 14 or earlier, the Pages Router, or a WordPress theme. - Version stepped up to 16 - Routes moved to the App Router in stages - WordPress kept as a headless CMS if wanted Outcome: A Next.js site or app on a supported version that your team can keep changing ## What do our Next.js development services include? Build, take over, upgrade and staff Next.js work with one React team. - Marketing and content sites: Search-ready sites with structured data and a CMS your team can edit. - E-commerce storefronts: Headless storefronts connected to your commerce platform and payments. - SaaS front ends and portals: Signed-in apps with Auth.js sign-in and role-based access. - Headless CMS builds: WordPress or another CMS kept for content, Next.js for the front end. - Next.js upgrades: Next.js 13, 14 or 15 moved to 16, and the Pages Router moved to the App Router. - Performance and Core Web Vitals: Slow pages traced to images, scripts or data fetching, and fixed. - Salesforce integration: Forms and portals that read and write Salesforce data from server code. - Next.js team extension: Next.js engineers who join your team and work in your process. ## The Next.js stack we work with Next.js with the React, data and testing tools most teams already know. - Front end (Components and styling): React, Server Components, Tailwind CSS - Application framework (Routing, rendering and sign-in): Next.js, App Router, Auth.js - Data and content (Databases and CMS): Prisma, Drizzle, Headless CMS - Testing and delivery (How changes ship): Vitest, Playwright, Vercel, Docker ## Which Next.js versions are still supported? Next.js 16 is the Active LTS release. Next.js 15 gets security fixes until 31 January 2027, and Next.js 14 and earlier get none. Today: Next.js 14 or earlier on the Pages Router - Next.js 16, Upgrade the version: Step through 15 to 16, update React and dependencies, and fix breaking changes route by route. Next.js 14 and earlier are unsupported. 15 gets security fixes to 31 January 2027. - App Router, Move from the Pages Router: Move routes to the App Router and Server Components in stages, with both routers running side by side. Fits large apps that cannot move every route in one release. - Headless Next.js, Move off a WordPress theme: Rebuild the front end in Next.js and keep WordPress, or another CMS, for content. Fits sites where the theme limits speed, design or security updates. ## How can you work with our Next.js engineers? Three ways to engage. Each one is agreed in a written proposal before work starts. - Fixed-scope project, We deliver a defined site, app or upgrade. - SynconAI directs the work to agreed milestones - Billed by milestone, as set out in the proposal - A live site, tests and documentation - Fits a launch, a rebuild or an upgrade - Dedicated team, A Next.js team that works only on your product. - You set priorities, our lead runs the team - Billed monthly for the team - Engineers, a lead and testing as needed - Fits a product or site with a steady backlog - Team extension, Next.js engineers who join your team. - Your managers direct the day-to-day work - Billed monthly for each engineer - Vetted engineers, with employment and replacement handled by us - Fits teams with a working process that need more hands ## How does a Next.js engagement start? Five steps from the first call to a working site. - Brief: Call about your site and goals; Repository access or a written scope - Match or design: Engineers matched to your stack; Plan and proposal in writing - Start: NDA, access and preview deploys set up; Codebase walkthrough and a first task - Build and review: Every change on a preview link; Code review and demos with your team - Hand over or continue: Documentation and a handover session; Or a monthly plan for ongoing work ## Cost and timing The first step is a free 60-minute architecture review of your Next.js 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 is Next.js development? Building and supporting websites and web apps with Next.js, the React framework. We build content sites, storefronts, SaaS front ends, headless CMS sites, portals and documentation sites. ### Is our Next.js version still supported? Next.js 16 is the Active LTS. Next.js 15 gets security fixes until 31 January 2027. Next.js 14 and earlier are unsupported, so we upgrade them first. ### How does a Next.js engagement work? As a fixed-scope project with milestones, a dedicated team, or engineers who join your team. Scope, people and billing are agreed in a written proposal before work starts. ### Can your Next.js engineers join our team? Yes. They work in your repositories, standups and code review, and your managers direct the work. We handle their employment and any replacement. ### How do you vet Next.js engineers? Each engineer goes through a technical interview on React and Next.js, a practical code task and a review with a SynconAI lead. You can interview them before they start. ### Can a Next.js site connect to Salesforce? Yes. Server code calls Salesforce through jsforce, a community library, or the REST, Bulk and Pub/Sub APIs with OAuth 2.0, so no credentials reach the browser. ### Which time zones do you work in? Our hubs in Delaware and Sydney cover United States and Australian working hours, and we deliver remotely worldwide on your business hours. Overlap hours with your team are agreed before work starts. ## Where we work Next.js 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 - React development: https://synconai.com/react-development ## Cite When citing SynconAI Next.js development, link https://synconai.com/nextjs-development or https://synconai.com/nextjs-development.md.