TypeScript development company

What TypeScript is and why it matters to a business

TypeScript is an open source language created by Microsoft. It is JavaScript with types added: the code says that a field is a date, a price is a number, or an order always has a customer. Before the code runs, the TypeScript compiler checks that everything fits together and then turns it into regular JavaScript that runs in any browser or in Node.js.

For a business owner, the value is fewer surprises. A whole class of bugs, such as passing the wrong kind of data between screens, misspelling a field or forgetting a case, is flagged in the developer's editor instead of by a customer. Types also act as documentation, so a new developer can understand an unfamiliar codebase faster. That makes TypeScript projects easier to hand from one developer or agency to another.

TypeScript is now the default for most new React, Angular, Vue and Node.js projects, so choosing it rarely narrows your hiring options.

It also changes how safely a codebase can be changed. When a developer renames a field or changes how an order is stored, the compiler lists every place in the app that needs updating. In plain JavaScript, those places are found by testing, or by customers. Over a few years of changes, that difference adds up to fewer emergency fixes and cheaper new features.

When TypeScript is worth it, and when it is not

• Worth it: any app expected to live for years, grow in features or be worked on by more than one developer.
• Worth it: software where data correctness matters, such as billing, scheduling, inventory and anything with money or compliance.
• Worth it: one language across the stack. A TypeScript team can write the React front end, the Node.js API and a React Native app and share types between them.
• Less important: a short script, a one-off prototype or a small site that will be thrown away. Plain JavaScript is fine there.
• Not a substitute for testing or good design. Types catch mismatched data, not wrong business logic. Compared with typed backend languages such as C#, Java or Go, TypeScript's checks disappear at run time, so data from outside the app still needs validating.

TypeScript projects we take on

• Full-stack web apps with React or Next.js on the front and Node.js on the back, sharing one set of types.
• APIs and integrations that connect your CRM, accounting, payments and industry tools.
• SaaS products and customer portals with roles, billing and reporting.
• Gradual conversion of an existing JavaScript codebase to TypeScript, file by file, while features keep shipping.
• Cleanup of TypeScript projects where checks were switched off or "any" types are everywhere, so the compiler is useful again.

TypeScript developer for hire or a TypeScript development company?

A freelance TypeScript developer for hire is often the right call for a defined piece of work in a codebase that is already in good shape, especially if someone on your side can review their code.

An in-house developer gives you steady capacity and business knowledge, at the cost of recruiting, salary, benefits and the risk of everything living in one person's head.

A staffing agency can place a contractor quickly, but you still manage the work and the result.

A TypeScript development company like Zoti provides the whole team: design, front end, backend, testing and a project manager who owns the plan. Zoti's monthly plans start at $499/month and cover design, development, hosting and ongoing changes, with a written quote before work begins.

How we convert a JavaScript app to TypeScript

1. ReviewWe read the codebase, list risky areas and agree what must keep working throughout.
2. Set up the compilerTypeScript is added alongside the existing JavaScript, with loose settings so nothing breaks on day one.
3. Convert in roundsWe convert the most important files first, typically data models and API calls, while new features keep shipping.
4. Tighten the checksAs coverage grows we switch on stricter settings so the compiler catches more problems.
5. Keep it healthyNew code is written in strict TypeScript and checked automatically before every release.