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NinjaNext

Web App Development

Web application development with React and Next.js

We build web applications that people use every day: booking sites, customer portals, admin dashboards and installable web apps for staff. We work in React, Next.js and TypeScript, keep pages fast and accessible, and connect them to typed APIs. When staff need to keep working without a connection, we build the admin as an offline-first progressive web app.

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From $1,000 ยท fixed quote after we agree the scope

Technology we have used

  • Next.js
  • React
  • TypeScript
  • Tailwind CSS
  • Vite
  • Redux Toolkit
  • TanStack Query
  • Ant Design
  • Angular
  • PWA (vite-plugin-pwa)
  • Vitest

Is this right for you?

Problems this service solves

Web App Development usually suits teams in one of these situations.

  • Businesses that need a customer website with booking, payments or account areas
  • Teams that run operations from an admin panel and need it to be quick and clear
  • Products moving from spreadsheets or WordPress plugins to a proper web app

How we test it

We type the code end to end and test business logic with Vitest or Jest. Where the project allows, we set up lint and tests to run in CI. We validate forms on the server and plan spam protection for any public form.

What you get

Deliverables

What a typical engagement includes. We agree the exact scope with you before work starts.

  • Customer-facing web apps

    Search, booking and checkout flows, customer accounts and self-service pages.

  • Admin dashboards

    Tables, filters, charts, exports and role-based screens for the people running the business.

  • Progressive web apps

    Installable admin apps with offline queues that sync when the connection returns.

  • Performance and accessibility

    Server rendering where it helps, optimised images, keyboard support and readable contrast.

  • Deployment

    CI pipelines to Azure, Windows servers with IIS, or static hosting, with health checks.

Our approach

How the work runs

The same five steps on every project, with working software to review every week.

Scope your project

  1. Share your idea

    Tell us what you want to build, who it is for and what has to be true for it to succeed.

    You get: A short written summary of the problem and a suggested first release.

  2. Plan and design

    We agree the scope, the screens and the technical approach before writing production code.

    You get: An agreed scope, designs for the key flows and a milestone plan.

  3. Build and demo weekly

    We build in small steps and give you a working version to try every week.

    You get: A tested, working product that grows each week.

  4. Launch

    We prepare the release, from store listings and privacy pages to hosting and monitoring.

    You get: Your product, live for real users.

  5. Grow

    After launch we fix, improve and extend the product based on what users actually do.

    You get: A product that keeps improving, or a smooth handover.

Related work

Case studies

Projects where we have done this kind of work. Client names appear only where the client agreed.

All work

Industries

Where we have applied it

Sectors where we have built this kind of software.

All industries

FAQs

Web App Development: common questions

Do you build with Next.js or plain React?

Both. Public pages that need search visibility, such as a booking website, suit Next.js. Internal dashboards behind a login are often simpler as a React and Vite app. We pick based on who uses the app and whether it needs to rank.

Can our staff use the admin panel offline?

Yes. We have built an installable admin app that keeps a queue of changes while offline and syncs them when the connection returns, with conflicts recorded in an audit log.

Can you take over an existing web app?

Usually, yes. We start with a short code review to check structure, dependencies and security, then agree what to fix first before adding features.

Have a question that is not here? Ask us directly.

Let's build it

Have a project like this in mind?

Tell us what you are trying to achieve. We will reply with honest feedback on scope, approach and next steps.

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