Languages and development
JavaScript and TypeScript: one stack for frontend and full-stack
JavaScript and its typed superset TypeScript are the primary language for client interfaces in KT.Team practice. Nearly all user interfaces, PWAs, and SSR layers of our solutions are built on it. One language covers the browser, the server (Node.
The language for interfaces and a thin full-stack layer: browser, SSR, and build tooling in one stack. KT.Team keeps heavy logic in PHP, Java, or Python, while JS/TS handles the UI.
Our clients
Clients and partners
One languageJS/TS covers the browser, the server (Node.js), and the build — front and back speak one language, fewer boundaries between teams
PWAOne codebase instead of iOS/Android builds: offline mode, push, and install without app stores (Flipkart: +70% conversion among users who installed)
MarketThe largest ecosystem of web developers and packages (npm) offers ready-made solutions for any UI task and faster team ramp-up.
AI-readyAI SDK and MCP are TypeScript-native: AI features embed into the web interface on the same stack, with no separate backend
Industry solutions
What you can build with JavaScript
Capabilities
JavaScript capabilities
Browser: React or Vue SPA/PWA, Service Worker (offline, push)TypeScript: shared types and contracts for client and serverNode.js SSR: Next.js or Nuxt — server rendering, first screen, SEONode API layer: aggregation, authorization, request orchestrationAI SDK 6 + MCP: unified access to models and toolsDomain services and integrations (PHP/Java/Python, databases, queues)
One language for front and back
One language in the browser, on the server (Node.js) and in the build. Teams reuse validation code, types and utilities across client and server, with less context switching and duplication.
PWA instead of native apps
Progressive Web Apps provide offline mode, push notifications, and home screen installation without store publishing. One codebase instead of iOS/Android builds; updates go live instantly.
Speed of shipping interfaces
Ready-made component ecosystems (React, Vue), hot reload, and Vite shorten the cycle from mockup to working screen. Less time on UI infrastructure, more on business logic.
The npm ecosystem
The world's largest package registry: ready-made solutions for forms, charts, maps, payments, analytics. Rarely does a UI task require writing from scratch.
TypeScript as a safety net
Static typing catches errors before production, makes refactoring safe and code self-documenting and transferable: a new developer ramps up faster.
SSR and SEO for content projects
Next.js and Nuxt render pages on the server: a fast first screen, correct indexing by search engines and AI engines, plus rich client-side interactivity.
Approach
How we implement JavaScript
Without modifying the core
We don't fork or patch the JavaScript core. JavaScript stays on a standard, updatable version — business logic moves into separate microservices alongside, so platform updates don't break your customizations.
International Standards, Not Homegrown Hacks
Where a mature international solution exists, we use it instead of inventing our own protocol or platform. Before writing code, we study how the problem is already solved in the industry.
Transferability
The solution is loosely coupled and documented: it can be handed over between teams and contractors without rewriting. You are not tied to us.
AI compatibility
JavaScript in the AI loop
AI SDK as the integration standard
Vercel AI SDK 6 (December 2025) provides a single TypeScript API for many providers, including OpenAI, Anthropic, Google, Mistral, and others. Switching models does not require rewriting the app.
MCP in TypeScript
Model Context Protocol has an official TypeScript SDK, and AI SDK 6 provides stable MCP support. Browser and Node access tools and data through one protocol without vendor lock-in.
Agentic UI generation
LLMs generate and assemble React/Vue components on the fly; response streaming and server actions let you build dynamic interfaces on top of the model right in the web.
RAG chats in the browser
The JS/TS stack covers the full RAG assistant flow: a browser widget, a Node orchestration layer, token streaming, and connections to vector stores, with no backend in another language.
Human-in-the-loop out of the box
AI SDK 6 added confirmation for tool calls and agents (ToolLoopAgent): the user approves model actions before execution, making agent control part of the UI.
Context 2026
What changed in the market
Node.js
Active LTS is Node.js 24 (recommended for production); Node.js 26 shipped in May 2026 as Current and becomes LTS in October; Node.js 22 is in the Maintenance phase.
React
React 19 (the stable line, latest 19.2.7 as of June 2026) locked in Server Components, Actions, and the compiler; the de facto standard for interfaces: ~83.6% usage among State of JS 2025 respondents.
Vue
Vue 3.5 is the current stable branch; Vue 3.6 with Vapor Mode (dropping the virtual DOM, speed on par with Solid.js) became feature-complete in April 2026.
TypeScript
TypeScript 5.x is the production standard; TypeScript 7.0 Beta (April 2026) with a Go-based compiler delivers up to about 10x faster compilation and type checking (VS Code: 89s to 8.7s). 40% of developers write only in TS.
Build and SSR
Vite overtook Webpack on satisfaction (98% vs. 26%); Next.js 16.2 and Nuxt 4.4 are the main SSR frameworks, focused on dev-server speed and AI-agent support.
Honestly
Pros and cons
Pros
- One language covers the browser, server and build — fewer boundaries between teams, reuse of types and code
- PWA replaces native apps for most scenarios: offline, push, install, instant updates, one codebase instead of iOS+Android
- The largest package ecosystem (npm, ~4M) — ready-made solutions for almost any UI task
- TypeScript makes code type-safe, transferable, and fit for safe refactoring
- First-class AI support: AI SDK, MCP, agents and RAG natively in TypeScript
Cons
- Ecosystem fatigue (JavaScript fatigue): the rapid churn of tools and frameworks demands discipline in stack choice and dependency control
- Bundle size: rich SPAs grow easily, requiring deliberate work on performance and code splitting
- SPAs without SSR index poorly in search engines and AI engines — server rendering (Next.js/Nuxt) is mandatory for SEO-critical pages
- Deep typing and abundant dependencies raise maintenance costs unless you watch npm supply-chain security
Projects
Cases
Subscription grocery delivery service for Danone
- Average order value grew from ₽1,294 to ₽3,111
- Monthly revenue grew from ₽89,312 to ₽1,051,624
- Site conversion rose from 0.14% to 1.25%
Brandquad PIM for Campari Rus
- Product information updates in one click
- Went from start to production launch in 2 months
New IT architecture for Muztorg
Learn moreDiscuss JavaScript and TypeScript as one stack
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