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Turnkey development of high-speed SPA web applications

We create interactive web applications with the feel of a native desktop program. Instant transitions between screens without white flickering and browser reloading, smooth microanimations, asynchronous data loading, and maximum UX for personal cabinets, portals, and fintech services.

✓ Immediate interface feedback (< 100ms): smooth rendering without page reloads
✓ Modern reactive stack: React 19, Vue 3 (Composition API) or fast Svelte 5
✓ Bundle optimization: code splitting, lazy loading components and asset compression through Brotli/Gzip
✓ Full SEO-compatibility: hybrid Server-Side Rendering (SSR) or Pre-rendering for search engines
React 19 & Next.js Vue 3 & Nuxt TypeScript & Vite Tailwind CSS TanStack Query & Zustand
Get technical evaluation
Formats and pricing
ALL IT • SERVICE SPEC
SLA 99.9%
[ Technological IT Solutions ] WARRANTY UNDER AGREEMENT
Responsive user interface

Rendering speed: 35ms • Client-Side Routing • 100% smoothness 60 FPS • No page reloads

⏱ Start: 1–3 days 🛡️ NDA: 100% SLA Warranty
⚡
35ms Response
Instant UI
⚛️
React 19 / Vue 3
Modern Stack
🔀
Zero Reload
Client Routing
🔒
State Sync
Stable Cache
✓ Official contract with fixed cost of work
✓ 100% transfer of rights to code and configuration to the customer
✓ Assigned leading engineer and support 90 days
FULL TRANSFER OF RIGHTS CONTRACT + WARRANTY
[ BUSINESS ADVANTAGES ]

Why market leaders choose SPA for their web services

Single Page App technology ensures an unmatched level of user engagement and conversion

[ 01 ]

Conversion Growth and Engagement

Absence of delays during menu clicks and filters increases the user's dwell time and depth of views on 40%.

[ 02 ]

Reduce load on servers

The server sends only clean data in JSON format, not heavy HTML code of pages. This reduces the load on the backend by 3–5 times.

[ 03 ]

Convenience of complex business logic

Ideal environment for interactive calculators, product configurators, CRM interfaces and financial charts.

[ 04 ]

Single API for the web and mobile applications

SPA interacts with the backend through REST or GraphQL API, which can simultaneously serve iOS and Android apps.

Stages of SPA Development

What is included in turnkey Single Page Application development

Full engineering cycle from component system design to performance testing

[ STEP 01 ] Design

UI/UX prototyping and design system

We create ergonomic prototypes in Figma, interactive clickable prototypes and a library of reusable UI components.

[ STEP 02 ] Architecture

State architecture design (State Management)

We configure the global state storage (Zustand, Redux Toolkit or Pinia) and server data caching with TanStack Query.

[ STEP 03 ] Frontend

Reactive frontend development on TypeScript

Writing reliable typed code without runtime bugs: form validation, reactive filters, tables with row virtualization.

[ STEP 04 ] API

Integration with REST API or GraphQL backend

Secure authentication via JWT / HttpOnly Cookies, error handling and automatic token refresh (Refresh Token).

[ STEP 05 ] Optimization

Optimization of Core Web Vitals and speed

Splitting the bundle into microchunks (Code Splitting), configuring lazy loading of images and minimizing CSS for 95+ Google PageSpeed points.

[ STEP 06 ] Testing

End-to-End testing and release preparation

We cover user scenarios with Playwright/Cypress automated tests, configure CI/CD deployment and CDN caching.

[ Tariff Plans ]

Development packages for Single Page Application applications

Transparent fixed budgets and phased payment according to the contract

For user accounts and startups

SPA MVP / Dashboard

Quick launch of a functional single-page interface for your backend or API with basic cabinets.

Development time: from 3–5 weeks
Work Scope:
✓ Development up to 5–8 reactive screens and modal windows
✓ Stack React or Vue 3 on pure TypeScript
✓ User authentication (Login, Register, Reset)
✓ Integration with your existing REST API backend
✓ Adaptive layout for mobile devices and tablets
✓ 30 days of full warranty support
Choose the 'SPA MVP' Plan
Best for e-commerce, services, and SaaS ★ Popular

Commercial SPA Platform

Full-featured commercial application with interactive catalogs, filters, shopping cart and analytics.

Development time: from 6–8 weeks
Work Scope:
✓ Everything that is included in the package «SPA MVP»
✓ Up to 15–20 complex interactive screens
✓ Virtualized product lists for working with thousands of records
✓ SSR / SSG optimization for ideal search SEO
✓ Integration of payment systems (Stripe, WayForPay, LiqPay)
✓ 60 days of warranty support
Choose 'Commercial SPA'
For fintech, banks, and complex corporate systems

Enterprise Highload SPA

Highly secure SPA-system with microfrontends (Module Federation), WebSocket data synchronization in real time and audit.

Development time: from 10–14 weeks
Work Scope:
✓ Everything that is included in the package 'Commercial SPA Platform'
✓ Microfrontend architecture (Webpack / Vite Module Federation)
✓ Bidirectional data exchange in real time (WebSockets / SSE)
✓ Strict compliance security and protection from XSS / CSRF attacks
✓ Full coverage with automated E2E tests (Playwright)
✓ Dedicated development team and lifetime code warranty
Choose 'Enterprise SPA'
← Swipe options →
[ COST CALCULATOR ]

Calculate the cost of developing your SPA application

Select key features for the preliminary budget calculation

1. Type and purpose of SPA application: Select Variant

2. Availability of backend (API): Select Variant

3. Real-time data updates: Select Variant

CHOOSEN PARAMETERS OF THE SOLUTION:
⏱ Estimated Timeline: Calculation... 👥 Team: 2–3 engineers
1. Type and purpose of SPA application: Personal Client Cabinet or Analytical Dashboard
2. Availability of backend (API): Ready REST API or GraphQL backend
3. Real-time data updates: Standard HTTP Requests by User Actions
✓ Parameters will be fixed in the application form
Get an exact quote
[ STAGES OF COOPERATION ]

How the project is delivered

Transparent process from first contact to final release on your domain.

01
1–2 weeks

Analysis of requirements and UI mockups

We Create Clickable Interactive Figma Prototypes and Coordinate Screen Architecture.

02
2–3 weeks

Development of components and routing

Designing the design system, configuring transitions between screens and managing global state

03
2 weeks

Integration with backend and API

Integrate authentication, business logic for forms, payment services, and event analytics

04
1 Week

Testing and optimization of speed

We optimize rendering speed up to 60 FPS, test on various smartphones and mobile networks.

05
3–4 days

Release to production and training

We deploy the application on high-speed CDN servers, configure caching, and deliver the final code

Our Clients

Companies that have entrusted ALL IT Agency with the development and scaling of their digital solutions

Wizeclub
DIM Service
Partner Case 11
Partner Case 6
Meregi Group
Partner Enterprise
Valikhnovski Surgery Institute
TOV Zagin Alpha
Partner Case 5
Wizeclub
DIM Service
Partner Case 11
Partner Case 6
Meregi Group
Partner Enterprise
Valikhnovski Surgery Institute
TOV Zagin Alpha
Partner Case 5
[ FREQUENT QUESTIONS ]

Answers to common questions from customers

Key details regarding terms, independent website editing, and rights transfer.

Yes. Although classic SPA are rendered in the user's browser, we implement hybrid technologies SSR (Server-Side Rendering) based on Next.js/Nuxt or pre-rendering services. Search engines Google receive fully ready HTML code of the page, which ensures the highest positions in organic search results.

React is a global standard for large teams and large-scale ecosystems with thousands of ready-made libraries. Vue 3 stands out with exceptionally fast development speed, more understandable syntax and high productivity. We select the stack according to the specifics of your project and the available competencies of your team.

We do not store sensitive authorization tokens in LocalStorage, where they can be read by malicious scripts. Authorization works through protected cookies with HttpOnly, SameSite=Strict and Secure flags, which prevent access to them from JavaScript.

Yes! SPA on React or Vue can be easily transformed into a Progressive Web App (PWA) with an icon on the desktop or packaged using Capacitor/React Native into a full-featured mobile app for App Store and Google Play while preserving 90% codebase.

Yes, the client is 100% the sole owner of all the source code, rights of intellectual property and design system. All the code is transferred to your private Git repository with clean documentation and deployment instructions.

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Do you need a fast and modern SPA web application?

Describe your idea or provide a technical specification. Our Lead Frontend engineer will prepare an architectural assessment and cost calculation within 24 hours.

Confidentiality

Official NDA contract for system audit

Quick Feedback

We will contact you within 15 minutes during business hours.

Order the development of an SPA application

The tech lead will contact you within 15 minutes during working hours