We write production code in TypeScript. JavaScript is the foundation, the runtime, and what we use for learning, scripting, and quick prototypes — but for serious production work, TypeScript is what we ship. In 2026 that’s the settled industry default (69%+ adoption, native TS across Node.js, Deno, and Bun, AI tools defaulting to TS/JS). The modern stack we lead with: Next.js for frontend, React Native for mobile, Node.js / Bun / Deno for backend when Python isn’t the call, Payload CMS as our TypeScript CMS, Claude Code + Cursor as the AI productivity layer. Our own site runs on Next.js + Payload.
We write production code in TypeScript. JavaScript is the runtime, the foundation, the language we write learning code in. For serious production work, TS is what we ship.
JavaScript is the foundation of modern web development, powering everything from interactive frontends to server-side applications via Node.js, Deno, and Bun. NerdHeadz delivers JavaScript and TypeScript development across the full stack — building fast, maintainable, scalable applications using React, Next.js, and Node.js as our default stack, with Vue, Svelte, Hono, and other modern frameworks when client requirements shape the call.
Our JavaScript/TypeScript expertise spans single-page applications, multi-page Next.js apps, progressive web apps, real-time features with WebSockets, serverless and edge functions (Vercel, Cloudflare Workers), complex data visualizations, REST and GraphQL APIs, and integration with AI services (Anthropic, OpenAI, Gemini). We write clean, tested code that follows best practices for performance, security, and accessibility — and crucially, we write it in TypeScript by default. That’s the 2026 production standard and the language we ship in.
We also modernize legacy JavaScript codebases (jQuery-era apps, pre-React patterns, CommonJS migrations), tighten bundle sizes, and migrate teams from build-tool sprawl into modern, fast toolchains (Vite, Turbopack, esbuild, pnpm). And we lead with AI tooling in the loop — Claude Code is our default for serious work, with Cursor for daily IDE work. The combination of TypeScript’s type safety + AI-assisted code generation is genuinely additive.
The honest current positioning: our own NerdHeadz site runs on Next.js + Payload CMS — TypeScript top to bottom, deployed on infrastructure we own, with AI tools in the development loop. It’s the stack we’d ship for clients we care most about, and it’s what underlies the broader selfware thesis the rest of our work builds on.
The most important honest framing on this page: JavaScript is the foundation; TypeScript is what we ship. The 2026 industry has converged on this. Three reasons it matters for your decision.
Multiple independent industry sources (Stack Overflow Developer Survey, State of JS, ecosystem package telemetry) consistently confirm: TypeScript is now the production default among new JavaScript projects. The 2026 question flipped from “should we use TypeScript?” to “why aren’t you using TypeScript?” Type safety has won the production-engineering argument.
The build-step friction that defined TypeScript adoption pre-2025 is essentially gone. Node.js 24 ships native TypeScript via type stripping — run .ts files directly. Deno has been TypeScript-native since launch. Bun ships native TypeScript with zero-config UX. Production TypeScript no longer requires the tsc + bundler + watch-mode dance.
Every AI coding tool we use daily — Claude Code, Cursor, v0, Lovable, Bolt — generates TypeScript/JavaScript by default. The combination is genuinely additive: types catch the errors AI introduces, and AI handles the boilerplate that types make verbose. The most productive modern stack of 2026 is TypeScript + AI tooling.
Practical implication for your project: if a developer or agency proposes new production work in JavaScript-without-types in 2026, ask why. The cases where pure JavaScript still wins are narrow — quick scripts, learning code, very-small prototypes, specific Node.js modules with no type complexity. For everything else, TypeScript is what we ship.
We write production code in TypeScript — types catch bugs at compile time, refactors stay safe at scale, large codebases stay maintainable. JavaScript is the runtime underneath and what we use for scripts, prototypes, and learning. 2026’s settled default; 69%+ industry adoption.
Frontend (Next.js, React), backend (Node.js / Bun / Deno), mobile (React Native), CMS (Payload), all in TypeScript — shared types, shared validation, shared tooling. The full-stack TS pattern reduces context-switching cost meaningfully for the workloads that fit it.
Every AI coding tool we use daily — Claude Code, Cursor, v0, Lovable, Bolt — defaults to TypeScript/JavaScript. The 2026 most-productive stack is TS + AI tooling in the loop; this is the foundation the broader “3× faster with AI-assisted engineering” thesis sits on.
Node.js 24 is our production default (mature, 100% npm-compatible, 2.1M packages, native TS now). Bun 1.2/2.0 when performance matters most (110K req/s, sub-5ms cold starts). Deno 2.x/3.0 when TypeScript-native UX + security-by-default shape the call. WinterCG convergence means runtime choice is a deployment decision, not a lock-in.
React 19 with server components, Next.js 15+ with the App Router, React Server Components, server actions, streaming SSR. Modern patterns shipped properly — not legacy Pages Router holdovers, not vibey component sprawl. Real architecture decisions, real type safety, real performance.
Vite as production default for non-Next.js work, Turbopack (Next.js 15+ Rust-based bundler) shipping in production, esbuild for speed-critical paths, pnpm or bun install for fast package management, ESM throughout. The 2026 build tooling is fast and reliable in a way the webpack era never was.
The 2026 runtime story isn’t “which one wins” — it’s diverse runtimes, all production-ready, each with a distinct sweet spot, all converged on the WinterCG cross-runtime standard. Here’s the honest map.
17 years of production stability, 65% of backend JavaScript, 85% enterprise traffic share, 100% npm compatibility (2.1M+ packages). Node.js 24 adds native TypeScript (type stripping, no build step), a stable permission model (adopted from Deno), and an improved test runner. Our default when stability, ecosystem maturity, or enterprise compatibility matter — which is most production work.
110,000 req/s HTTP throughput (2-4× faster than Node for serving), sub-5ms cold starts (king of serverless edge), bun install 10-20× faster than npm. All-in-one (runtime + package manager + test runner + bundler). Adopted in production by Cursor, Midjourney, and others. Our pick when performance is critical at the edge, package-install speed transforms CI/CD economics, or DX is structurally important.
Created by Node.js’s original creator to address Node’s design regrets. TypeScript-native since launch. Security-first: programs run in a sandbox requiring explicit --allow-net / --allow-read permissions. Deno 2.0 resolved npm compatibility (~95%). Built-in formatter, linter, test runner, bundler. Our pick when TypeScript-native UX is critical, security isolation matters (post the 2025 npm supply-chain attacks), or sovereign edge deployment shapes the call.
JavaScript at the edge — Vercel Functions (Node + Edge runtime), Cloudflare Workers (V8 isolate, sub-ms cold starts, global distribution). Different runtime model: limited Node compatibility, but ridiculous global performance and pricing economics for the right workload. We deploy Next.js to Vercel by default and route specific high-traffic edges to Cloudflare Workers when latency or cost economics justify it.
The WinterCG convergence matters. All three major runtimes + the edge platforms converged on a shared standard, meaning your runtime choice is now a deployment decision, not an architectural lock-in. Some teams develop on Bun (for the DX wins) and deploy on Node (for npm compatibility). We architect for portability when that matters.
Each layer of the stack has a default we lead with, with alternatives we deploy when the project demands. The deeper pages for each layer cover the specific tool in depth.
Next.js (App Router, React 19, Turbopack) is our frontend default. React is the component model underneath. Vue, Svelte, Solid, or Astro when client requirements specifically demand them. What our own site runs on.
React Native + Expo for serious cross-platform mobile — real native code, shared with React on the web for many components. FlutterFlow when no-code-with-Flutter-eject fits. Natively for wrapping existing web apps.
Node.js 24 as default (mature, npm-complete, native TS). Bun when performance matters most. Deno when TypeScript-native UX + security shape the call. Split-stack with FastAPI/Python when ML/data/AI compute justifies it.
Payload CMS as our TypeScript code-first CMS — schema in TS, content collections that match your application types, ejectable anywhere Next.js deploys. The selfware-thesis answer to content management; what our own site uses.
Supabase (managed Postgres with pgvector, auth, storage, realtime) as our database default. The TS clients are excellent; pgvector + Postgres FTS handle most retrieval needs in-stack. Elasticsearch layered in when hybrid keyword + vector retrieval at scale is structural.
Claude Code is our default for serious work — deep codebase understanding, multi-file refactors, agentic tool use. Cursor for daily IDE work. v0 / Lovable / Bolt when their generation fits specific tasks. All default to TypeScript output.
Hosting: Vercel for Next.js by default (fluid compute, global edge), Cloudflare Workers for latency-critical edge functions, AWS or GCP when the broader application demands. Build tooling: Vite, Turbopack, esbuild, pnpm — covered in the build-tooling block below.
The single most common architecture decision on our project pipeline: do we ship full-stack TypeScript, or split-stack with a Python backend? Both are real. The honest answer depends on workload.
Our actual practice: most production projects are full-stack TypeScript (Next.js + Node + Payload + Supabase). Most production AI projects are split-stack — Next.js TS frontend, FastAPI Python backend for the LLM orchestration + vector retrieval + AI agent logic, Supabase as the shared data layer. We pick honestly per project, not by language ideology.
The 2026 truth most agency pages won’t admit: AI tooling is now central to production JavaScript/TypeScript development, and the combination of TypeScript’s type safety + AI code generation is genuinely more productive than either alone.
Claude Code — Anthropic’s agentic coding tool with deep codebase understanding, multi-file refactors, tool use, and a frontier Claude Opus model. Our default for complex feature implementation, architectural refactors, debugging non-trivial issues, and any work where reading a codebase end-to-end matters. The “3× faster with Claude Code” thesis sits directly on this.
Cursor — IDE-native AI for in-the-flow coding. Tab completions, inline edits, Composer-mode refactors. Our default for daily coding work where staying in the editor matters. Pairs well with Claude Code for the deeper agentic work.
Generate React / Next.js / Tailwind code from prompts. We use these for specific tasks — landing pages, prototype scaffolds, internal tools — when generation is faster than hand-writing and the output is something we’ll extend properly. Output is TypeScript/JavaScript code we own, not vendor lock-in.
The combination is more productive than either alone. TypeScript types catch the errors AI generation introduces (wrong API shapes, hallucinated method names, off-by-one indices). AI handles the boilerplate that types make verbose — interface declarations, type guards, conditional types. The two technologies pair structurally; a genuine 2026 productivity multiplier.
Production JavaScript/TypeScript work in 2026 without AI tooling is leaving meaningful productivity on the table. We lead with it, calibrated to where it helps and where it doesn’t.
Five—eight real architectural decisions every JavaScript/TypeScript project faces. Here’s how we navigate them honestly — the default we lead with, the alternatives we deploy, and when we deviate.
| Decision | Our default | Alternatives | When to deviate |
|---|---|---|---|
| Language | TypeScript | JavaScript | Quick scripts, learning code, very-small prototypes, specific Node modules with no type complexity |
| Frontend framework | Next.js (App Router, React 19) | Vue, Svelte, Solid, Astro, Remix | Client team strength, very-simple sites, specific framework requirements |
| Mobile | React Native + Expo | FlutterFlow (no-code + eject), Natively (wrap web app), real native | Mobile-first project, performance-critical, existing web app needing only store presence |
| Backend runtime | Node.js 24 | Bun (performance), Deno (TS-native + security), FastAPI (Python for ML/data) | Performance critical, security-first, ML/data workload |
| CMS | Payload (TypeScript) | Sanity, Contentful, Strapi, Webflow | Marketing-only sites (Webflow), team-editing-first, specific schema requirements |
| Database | Supabase (Postgres + pgvector) | Plain Postgres, MongoDB, PlanetScale, dedicated vector DB | Multi-region, very-specific access patterns, billion-vector scale |
| AI tooling | Claude Code + Cursor | v0, Lovable, Bolt, GitHub Copilot | Specific generation tasks, IDE preference, team licensing |
| Hosting | Vercel (Next.js fluid compute) | Cloudflare Workers, AWS, GCP | Edge-critical, large-scale custom infrastructure |
Most production stacks combine all of these — Next.js + Node + Payload + Supabase + Claude Code is our most common foundation; some projects shift one or two layers for specific reasons. We pick honestly per project, naming the deviation reason explicitly. See the Web Development service for the broader picture.
The 2026 build and tooling landscape is fast and reliable in a way the webpack era never was. Four tools that define modern JavaScript engineering.
Native ESM dev server with HMR, esbuild-powered transpilation, Rollup-based production builds. Sub-second dev starts on most projects. Our default for Vue, Svelte, React (non-Next), libraries, and CLI tools. The build tool that doesn’t fight you.
Rust-based bundler from Vercel, built into Next.js 15+. Significantly faster than Webpack (the legacy Next.js bundler). Production-stable in 2026. Our Next.js work uses Turbopack by default; we fall back to Webpack only when a specific incompatible plugin demands it.
Go-based bundler, 10-100× faster than JS-based bundlers. Underpins Vite’s dev server and ships in our build pipelines for transpilation hot paths. We use it directly for library builds, monorepo task pipelines, and anywhere build-speed is the bottleneck.
pnpm as our default — content-addressable storage, hard-link node_modules, dramatically faster than npm/Yarn with much less disk usage. bun install when speed is critical (10-20× faster than npm). npm only when project constraints demand it. ESM throughout; CommonJS is legacy.
Two honest pictures: the TypeScript adoption trajectory crossing the production-default threshold, and where each runtime sits on real-world performance.
TypeScript crossed the production-default threshold in the 2024–2025 cycle. The 2026 question has flipped from “should we use TypeScript?” to “why aren’t you using TypeScript?” — and with all three major runtimes now shipping native TypeScript support, the build-step friction that defined adoption pre-2025 is essentially gone. This is the most important framing on this page. ¹
Bun leads on raw performance — 2–4× faster HTTP throughput than Node, sub-5ms cold starts (the serverless-edge sweet spot), installs 10–20× faster than npm. Deno sits in the middle with native TypeScript and security-by-default. Node.js remains the production default for stability, ecosystem maturity, and 100% npm compatibility. The honest read: pick by use case, not by benchmark headline — all three are production-ready in 2026. ²
For ML, data science, scientific computing, AI orchestration heavy lifting, or anywhere NumPy / pandas / PyTorch / scikit-learn / LangChain Python / LlamaIndex are structural — Python is the right answer, and FastAPI is our Python backend default. JavaScript’s ML ecosystem isn’t catching up meaningfully; don’t fight this.
For systems-level performance work — high-throughput data processing, CLI tools where startup time matters, performance-critical infrastructure — Rust or Go win on raw throughput and memory characteristics. JavaScript’s V8 (or Bun’s JavaScriptCore) is fast for what it is, but real systems-level work isn’t its lane.
For performance-critical mobile (gaming, AR/VR, complex animations, heavy graphics) where every native API matters, real native development (Swift / Kotlin) outperforms React Native meaningfully. React Native is excellent for product-shaped mobile apps; for performance-critical native, build native.
We’re language-pluralist when the workload demands it. JavaScript/TypeScript is our default for web and modern applications — not a hammer for every nail.
From modern Next.js + Node builds to legacy modernization and AI-tooling-accelerated delivery — what a buyer evaluating a real JS/TS engagement actually cares about.
This system has been a dream of mine for almost a year. I have tried to build it myself and finally came to the conclusion I needed help. The NerdHeadz team has built me exactly what I was dreaming about and more! Working with them has been an absolute pleasure. I can't thank them enough.
We write production code in TypeScript — types catch bugs at compile time, refactors stay safe at scale, large codebases stay maintainable. Our own site is TypeScript top to bottom. The settled 2026 default, applied to real work.
Next.js + React (frontend), React Native (mobile), Node/Bun/Deno (backend), Payload CMS (TS CMS), Supabase (DB). All TypeScript, all production-tested. The stack we’d ship for our own work, applied to yours.
Claude Code + Cursor as our defaults. v0 / Lovable / Bolt for specific generation tasks. TypeScript + AI tooling is the most productive modern stack of 2026 — and the foundation of our “3× faster” thesis.
Full-stack TypeScript when the workload fits. Split-stack with FastAPI/Python when ML/data/AI compute justifies it. Three runtimes (Node / Bun / Deno) picked honestly. No language ideology, no single-tool dogma.
TypeScript — by default, for serious production work. JavaScript is the runtime underneath and what we use for quick scripts, learning code, and very-small prototypes. The 2026 industry has converged on TypeScript as the production default (~69%+ adoption); type safety catches bugs at compile time, makes refactors safe at scale, and keeps large codebases maintainable. We’d push back on agencies still proposing new production work in untyped JavaScript in 2026.
Node.js 24 is our production default (mature, 100% npm-compatible, native TypeScript now). Bun 1.2/2.0 when performance matters most (110K req/s HTTP, sub-5ms cold starts for edge, 10-20× faster package installs). Deno 2.x/3.0 when TypeScript-native UX + security-by-default + edge deployment shape the call. The WinterCG convergence in 2026 means runtime choice is a deployment decision, not architectural lock-in — many teams develop on Bun and deploy on Node.
Depends on workload. Full-stack TypeScript (Next.js + Node + Payload + Supabase) when the workload is product-facing, I/O-heavy, real-time, or when one-language-end-to-end reduces operational complexity meaningfully. Split-stack with Python (Next.js TS frontend + FastAPI backend) when ML/data/AI compute or scientific libraries are structural — Python’s ecosystem here is decades ahead and isn’t catching up. Most of our serious AI work uses the split-stack pattern.
Next.js 15+ with the App Router, React 19, Turbopack. React is the component model underneath. Vue, Svelte, Solid, or Astro when client requirements specifically demand them. Our own site runs on Next.js + Payload CMS — that’s what we’d ship for clients we care most about. See the Next.js page for the depth.
Claude Code as our default for serious work (deep codebase understanding, multi-file refactors, agentic tool use). Cursor for daily IDE work. v0 / Lovable / Bolt for specific generation tasks (landing pages, prototype scaffolds, internal tools). All default to TypeScript/JavaScript output. The combination of TypeScript’s type safety + AI tooling is the foundation of our “3× faster” delivery thesis.
Yes — a common engagement. Common modernization paths: jQuery-era → modern React/Next.js, CommonJS → ESM, untyped JavaScript → TypeScript (incremental, file-by-file), Webpack → Turbopack/Vite, npm → pnpm/bun. We scope based on a codebase audit — a typical engagement is 6-16 weeks depending on size, with parity validation throughout.
Depends on workload shape. A single full-time hire works when the work is steady, in-house, with team-continuity needs. An agency works when the work is project-shaped, needs deep modern-stack literacy across many tools, or benefits from AI-augmented engineering pace (“3× faster” with Claude Code is structurally hard to match in-house). Most teams use a hybrid — in-house developers for ongoing maintenance + an agency for project work and acceleration.
React is the JavaScript library for building user interfaces — the component model and rendering engine. Next.js is a full framework built on React — adds routing, server components, server actions, SSR, build tooling, deployment patterns. React Native uses React’s component model but renders to native mobile (iOS/Android) instead of the browser. All three are real native code; you’d typically use Next.js for web and React Native for mobile.
Both real, both production-ready, different sweet spots. Vercel Functions (Node + Edge runtime) — tight Next.js integration, global edge distribution, fluid-compute pricing. Cloudflare Workers (V8 isolate) — sub-ms cold starts, global distribution, strong price-performance economics. We deploy Next.js to Vercel by default and route specific high-traffic latency-critical paths to Cloudflare Workers when economics justify it.
Webpack is legacy in 2026 — still widely deployed but the build-tool story is moving away from it. Vite is our default for non-Next.js React, Vue, Svelte, libraries, and CLI tools (sub-second dev starts via native ESM + esbuild + Rollup). Turbopack (Rust-based, Vercel’s bundler) is the Next.js 15+ default — production-stable in 2026, significantly faster than Webpack. esbuild sits under Vite and ships directly in our build pipelines for transpilation hot paths.
pnpm as default — content-addressable storage, hard-link node_modules, much faster than npm/Yarn with dramatically less disk usage. bun install when speed is critical (10-20× faster than npm). npm only when project constraints demand it. ESM throughout; CommonJS is legacy. Monorepo: pnpm workspaces or Turborepo orchestration.
We default to "strict": true in tsconfig.json (strict null checks, no implicit any, strict function types) for new TypeScript projects. For migrations from untyped JavaScript, we run incremental strict-ification per file. For advanced patterns — branded types, exhaustive switches with never, type predicates, conditional types — we use them when they earn their place. TypeScript’s type system is excellent for JavaScript, but it’s still structural on a dynamic runtime; we know its limits and the patterns that work around them.
Yes for AI application code (frontend UIs, API routes, prompt orchestration, LLM integration via the Vercel AI SDK, LangChain.js, the Anthropic SDK). For AI orchestration heavy lifting — complex agentic frameworks, vector retrieval pipelines, ML model serving, scientific compute — Python (FastAPI + LangChain Python + LlamaIndex) is meaningfully better and we lead with it. Most of our serious AI work is split-stack (Next.js TS frontend + FastAPI Python AI backend); see the FastAPI page for the AI side.
Extremely relevant. JavaScript is the foundation of the web (irreplaceable for frontend), the most-used language in production server-side work, the language AI coding tools default to, and the only language that genuinely runs in browsers, on servers (Node/Bun/Deno), on mobile (React Native), at the edge (Workers, Vercel), and increasingly in databases. Investment in JS/TS skills compounds across the full stack. The honest second-language pick alongside it: Python (for ML/data) or Rust (for systems).
Production JavaScript and TypeScript applications across AI products, learning platforms, and FinTech SaaS — custom web and mobile builds where modern stack architecture matters.
A pet-care marketplace connecting owners with trusted carers — a product-facing consumer app of the kind the modern JS/TS stack is built for.
View case study →
AI-powered learning platform delivering personalized mentorship — a content- and interaction-heavy web application where modern frontend architecture and real-time features matter.
View case study →
A tax-credit / compliance portal — a production web SaaS with forms, data flows, and integrations, the kind of I/O-heavy product-facing application the full-stack TypeScript pattern fits well.
View case study →The JavaScript runtime landscape evolved meaningfully in 2025–2026 — Node.js 24 added native TypeScript, Deno reached 2.x/3.0 maturity, Bun reached 1.2/2.0 production stability, all three converged on WinterCG, and TypeScript adoption crossed the production-default threshold. Verify current runtime versions, TypeScript adoption figures, and AI tooling lineup at publish; figures verified as of 2026-Q2.
30-minute scoping call. Whether you’re starting a new Next.js + Node project, migrating off legacy JavaScript, weighing full-stack TS vs split-stack with Python, or evaluating runtime choices (Node / Bun / Deno) — we’ll architect the right stack honestly and send a fixed-price quote. Production TypeScript + AI tooling in the loop; our own stack, applied to yours.
