TypeScript agency — type-safe from frontend to database
happycoding builds web apps and backends entirely in TypeScript: Next.js on the frontend, Node.js and NestJS on the backend, typed interfaces in between. The result: fewer integration errors, smaller teams, faster releases — and a stack with zero runtime license costs.
Since August 2025, TypeScript has been the most-used language on GitHub — ahead of Python and JavaScript. That's not a fashion, it's consolidation: frameworks, the talent pool, and AI tooling are converging on TypeScript. Any stack decision you make in 2026 is a decision for or against this ecosystem.
We don't sell ideology: CPU-intensive systems and massive parallelism remain solid JVM territory. Our domain is I/O-heavy web apps, APIs, and digital products that need to iterate fast — that's where an end-to-end type system earns its keep. Senior engineers own every architecture decision.
Terms you should know
Definition
- TypeScript
- TypeScript is JavaScript with a static type system: errors are caught at compile time, not in production. Developed by Microsoft, it has been the most-used language on GitHub since 2025. For decision-makers, that means the same discipline that made enterprise Java successful — applied across the entire web ecosystem.
Definition
- End-to-end type safety
- End-to-end type safety means one type system validates the entire chain, from the database schema through the API to the user interface. Interface errors between frontend and backend teams — one of the most common failure sources in split Java/JavaScript teams — are ruled out by the machine instead of hunted down in testing.
Definition
- NestJS
- NestJS is the structured enterprise framework for Node.js backends — with dependency injection, modules, and guards, the same patterns familiar from Java/Spring. Around three million weekly downloads, in production at companies including Adidas, Autodesk, and Decathlon.
The market behind it: according to the Stack Overflow Developer Survey 2025, 48.8 percent of professional developers use TypeScript — Java sits at 29.6 percent. In its Octoverse report 2025, GitHub names TypeScript the platform's most-used language for the first time — and cites, of all things, AI-assisted development as the main driver: 94 percent of compile errors in AI-generated code are type errors, so a strict type system acts as an automatic safety net.
TypeScript or Java? The honest answer: it's a workload question
The stack decision is not a matter of faith. We advise the way we would decide for ourselves — including the cases where the JVM remains the right choice:
| Criterion | TypeScript stack (Node.js) | JVM stack (Java/Spring) |
|---|---|---|
| I/O-heavy web apps & APIs | core strength: event-loop model, low overhead | solid, but heavier to operate |
| CPU-intensive processing, massive parallelism | limited — this is where we recommend the JVM | core strength: virtual threads, mature garbage collectors |
| Runtime license costs | none — Node.js LTS is free, with roughly 30 months of support per version | Oracle JDK on a per-employee subscription, or a switch to OpenJDK builds |
| Support cycles | predictable: Node 24 LTS through April 2028 | Spring Boot: 12 months of OSS support per minor version, then extended support |
| Team & talent | one language stack for frontend and backend, growing talent pool | separate teams are the norm; the senior market is tight and expensive |
| Typical domain | digital products, portals, APIs, fast iteration | long-lived core systems with stable requirements |
In practice, the decision is rarely "migrate everything." The realistic model for mid-sized companies is coexistence: the Java core system stays, new customer-facing products are built on the TypeScript stack and connect through cleanly defined APIs. Our guide Next.js as an integration layer for legacy systems shows how that works without big-bang risk.
What you can buy from us
Three paths to type-safe software — each with clear outcomes instead of experiments.
TypeScript product development
Web apps and custom software built entirely in TypeScript: an MVP with a clearly defined scope runs €8,000–20,000, a full web application typically €20,000–60,000.
Modernization alongside your core system
New digital products on the TypeScript stack, cleanly connected to your existing Java, ERP, or legacy system — modernization without a big bang.
TypeScript adoption & audit
For teams that want to make a JavaScript codebase type-safe or professionalize their Node platform — dependency governance included.
Packages and pricing
We name our price ranges before you have to ask. The ranges come from real projects — we deliberately do not quote flat rates without clarifying requirements first.
| Package | Scope | Price range |
|---|---|---|
| MVP in TypeScript | clearly defined scope, production-ready with senior review | €8,000–20,000 |
| Full web application | authentication, roles, more complex data logic, multiple user groups | €20,000–60,000 |
| Integration/modernization project | new TypeScript services alongside your existing system, API integration | project-dependent; fixed price after discovery |
| TypeScript/Node audit | codebase analysis, dependency governance, migration roadmap | on request |
As of July 2026. All prices net of VAT. Larger platform projects and heavily integrated systems are quoted individually.
FAQ
Common questions about TypeScript in the enterprise