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Web application development, without the drag.

Modern React and Next.js apps that load fast, scale cleanly, and don't need a rebuild in a year.

IN ONE ANSWER

Dev4ager builds custom web applications on React, Next.js, and TypeScript, including portals, data-heavy tools, and customer-facing products, using AI-assisted development with senior code review on every merge. Weeks to launch, your repo, fixed quotes.

What we build

Anything with a login and a job to do: customer portals, B2B tools, data dashboards, community platforms, AI-powered products. We handle the full slice, from UI to API to database to deployment, so you get one accountable team instead of three vendors pointing at each other.

  • Customer-facing apps with auth, roles, and clean onboarding
  • Data-heavy interfaces: tables, filters, search, exports, charts
  • Realtime features, including presence, live updates, and notifications
  • REST/GraphQL APIs and third-party integrations
  • Responsive, accessible UI on a proper design system
  • Testing, CI/CD, monitoring, and staging environments

How we build it

  1. Scope. Requirements become a fixed scope, price, and timeline, usually within 48 hours.
  2. Design. Wireframes and UI direction in Figma before code.
  3. Build + review. Claude Code and Cursor accelerate the build inside a human-defined architecture; seniors review every PR.
  4. Ship + support. Playwright suites, manual QA, CI/CD deploys, then iteration as usage grows.

Stack we reach for

React Next.js TypeScript Node.js Tailwind Supabase PostgreSQL Vercel

A great fit if…

  • You've outgrown spreadsheets, Airtable, or a no-code tool that's straining at the seams.
  • You need a customer-facing product that feels as good as the service behind it.
  • An existing app is slow, buggy, or unmaintained and needs a real team behind it.

Web app development FAQs

What's the difference between a website and a web application?

A website presents information; a web application does work. Users log in, create data, and run workflows, so web apps need state, auth, a database, and real engineering. For marketing sites, see our landing page service.

Why do you build on Next.js and React?

Next.js gives us server rendering for speed and SEO, a huge ecosystem, first-class TypeScript, and easy deployment on Vercel. It's also the stack AI coding tools know best, which compounds our speed advantage.

Can you take over an existing web app another team built?

Yes, takeovers are common. We start with a paid code audit (usually a few hours), report what's solid and what's risky, then either stabilize and extend the existing code or propose a phased rebuild. See bug fixing & code cleanup.

How do you keep web apps fast?

Server components and caching by default, small bundles, indexed queries, and image optimization, verified against Core Web Vitals before launch. There's also a dedicated performance service for existing apps.

Related

SaaS Development Performance Optimization API Integrations Guide: What is vibe coding?

Got an app to build (or rescue)?

Describe what it needs to do. We'll return a fixed scope, price, and timeline, usually within 48 hours.

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