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.

A language for interfaces and a thin full-stack layer: browser, SSR and build on one stack. KT.Team more often moves heavy domain logic and integrations to PHP/Symfony, Java or Python, while JS/TS handles what the user sees and touches.

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One languageJS/TS covers the browser, the server (Node.js), and the build — front and back speak one language, fewer boundaries between teams

PWA instead of nativeOne codebase instead of separate iOS/Android builds: offline, push and install without store publishing (Flipkart: +70% conversion among those who added it to home screen)

A huge hiring marketThe largest ecosystem of web developers and packages (npm) — ready-made solutions for almost any UI task and fast team scaling

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

Retail and e-commerce PWA storefront with an offline catalog and push Catalog, cart and checkout work like an app: add to home screen, product cache, order-status notifications. No cost for native builds or store publishing.

B2B and distribution User accounts and B2B portals Complex accounts with roles, price lists, approvals and orders. SSR for first-screen speed, TypeScript for reliability as features grow.

E-commerce Headless storefront on SSR A Next.js/Nuxt storefront on top of a headless backend: server rendering for SEO and fast loading, client interactivity for filters, search, and personalization.

Manufacturing and logistics Operational dashboards Real-time dashboards: charts, tables, filters, data updates without reloads. A rich ecosystem of visualization components shortens development.

Services and support RAG assistants and chats in the web An assistant built into the interface: response streaming, knowledge-base connection via MCP, user confirmation of actions. The whole path on one stack.

Media and content Content sites with server-side rendering Content and marketing sites on Next.js/Nuxt: server-side rendering delivers indexing by search engines and AI engines plus interactivity where it's needed.

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)

A typical layout: a thin React/Vue client talks to a Node layer (SSR and API tier) that proxies domain logic and connects AI via AI SDK and MCP. Loose coupling: the interface doesn't know the details of domain services, and AI providers are swappable.

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 deliver offline mode, push notifications, and home-screen install without publishing to app stores. One codebase instead of separate iOS/Android builds; updates ship 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

Minimal core modification

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, 20M+ downloads per month) provides a single TypeScript API to many model providers — OpenAI, Anthropic, Google, Mistral, and others. Switching models requires no app rewrite.

MCP in TypeScript

The Model Context Protocol has an official TypeScript SDK; AI SDK 6 includes stable MCP support. Browser and Node apps connect to tools and data through a single protocol with no 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 entire RAG-assistant path: a browser widget, a Node orchestration layer, token streaming and connection to vector stores — without a separate backend in another language.

Human-in-the-loop out of the box

AI SDK 6 added tool-call and agent confirmation (ToolLoopAgent): the user approves the model's actions in the interface before they run — agent controllability as 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 (native port), promises up to ~10x faster compilation and type checking (VS Code repo: 89s→8.7s, ~10.2x). 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