Services / Web App Development / Single Page Applications
Web App Development
Web App Development

Single Page Applications

Single page application development services — fast, accessible React and Vue SPAs with TypeScript, optimised Core Web Vitals, and the interactive performance your users expect from a native app.

5–12 wks
Typical Delivery
<1.5s
LCP Target
WCAG 2.1
Accessibility Standard

Single page applications deliver the instant, app-like interactivity modern users expect from web products — no full-page reloads, real-time UI updates, smooth transitions, and offline capability. We build SPAs using React with Next.js, Vue with Nuxt, and Angular — selecting the framework that best fits your team's expertise, your use case's SEO requirements, and your scalability trajectory.

Our SPA development practice is performance-first and accessibility-native. Every application is built with TypeScript for compile-time type safety, code-split and lazy-loaded per route for sub-second initial load, and optimised for Google's Core Web Vitals — targeting Largest Contentful Paint under 1.5 seconds, Cumulative Layout Shift under 0.1, and First Input Delay under 100 milliseconds. We have built SPAs for dashboards, B2B SaaS products, e-commerce interfaces, booking systems, and real-time collaboration tools across healthcare, fintech, proptech, and e-learning.

State management (Redux Toolkit, Zustand, Pinia, or React Query), routing, caching strategy, API error handling, optimistic UI updates, and WebSocket integration are first-class engineering concerns in our SPA builds — not afterthoughts added when they cause problems in production. WCAG 2.1 AA accessibility compliance is audited before launch, not retrofitted after an accessibility complaint.

component
React 18
TypeScript
app.rapidekops.com
React Next.js Vue TypeScript Zustand React Query Vite Playwright Tailwind CSS GraphQL
  • React, Vue, or Angular SPA with full TypeScript codebase
  • Route-level code splitting and lazy loading for optimal initial load performance
  • State management: Redux Toolkit, Zustand, Pinia, or React Query
  • REST or GraphQL API integration with caching, optimistic updates, and error recovery
  • Core Web Vitals optimisation: LCP, CLS, FID measured and targeted pre-launch
  • WCAG 2.1 AA accessibility audit with remediation before production deployment

Why RapideKops?

  • TypeScript is non-negotiable — runtime type errors are not acceptable in production SPAs
  • Performance is measured and targeted, not assumed — every component profiled before ship
  • Accessible by design from component architecture, not retrofitted after an audit finding
  • Component tests, integration tests, and E2E tests with Playwright or Cypress included
  • Responsive across all viewport sizes and tested on real devices — not just Chrome DevTools
  • Full TypeScript codebase documentation so your team can extend the SPA confidently

Our Delivery Process

01

Requirements & Wireframe

We map user journeys, define component hierarchy and state requirements, and produce interactive wireframes — ensuring shared vision before development starts.

02

Component Architecture

We design the component library, state management approach, API integration layer, and routing strategy with performance and accessibility as primary constraints.

03

Iterative Build

Components built, tested, and reviewed in two-week sprints. You see working screens throughout development — not just at the end.

04

Optimise & Launch

Core Web Vitals audit, WCAG accessibility review, cross-browser and device testing, then production deployment with a performance baseline report.

Frequently Asked Questions

When should we build a SPA versus a server-rendered application?
SPAs excel when your product is highly interactive — dashboards, real-time tools, drag-and-drop interfaces, or applications where users perform many actions within a session. Server-rendered applications are better when SEO and initial load time are priorities. Modern meta-frameworks blur this line — we recommend the right approach for your specific use case.
How do you achieve good SEO with a single page application?
For marketing or content pages where SEO matters, we use Next.js or Nuxt with server-side rendering or static generation — these pages return complete HTML to search engine crawlers. For authenticated product areas where SEO is not relevant, pure client-side rendering is fine. We design the rendering strategy per route, not one-size-fits-all.
Why is TypeScript required on your SPA projects?
TypeScript catches whole classes of bugs at compile time that would only surface as runtime errors in JavaScript — property access on undefined, incorrect API response shapes, missing switch cases. For any application over a few hundred lines, TypeScript makes refactoring safer and onboarding new developers significantly faster.
How do you handle real-time features like live updates and notifications?
We implement WebSocket connections for true real-time bidirectional communication — live activity feeds, collaborative editing, instant notifications. For simpler use cases, Server-Sent Events provide one-way streaming at lower infrastructure cost. We choose the right mechanism for your latency and scale requirements.
What is your approach to SPA performance optimisation?
We baseline Core Web Vitals before and after every significant change. Key techniques: route-level code splitting so initial bundles stay under 150kb, React.lazy and Suspense for below-the-fold components, image optimisation with WebP and lazy loading, API response caching with React Query or SWR, and virtual scrolling for long lists.

Recent Work

From the Blog

Get Started

Ready to Ship a World-Class Single Page Application?

We will build a fast, accessible, TypeScript-first SPA your users love and your engineers are proud to maintain.