TypeScript development.
JavaScript at scale, typed and maintainable.
TypeScript is the default on every JavaScript project we ship, frontend or backend. The type system catches bugs at compile time, makes refactoring safe, and keeps large codebases readable. After 8 years, we don't write untyped JavaScript for production anymore.
TypeScript across the full stack, frontend and backend
TypeScript isn't a framework, it's a layer of correctness on top of JavaScript that pays dividends throughout a project's lifetime, not just at the start.
TypeScript React Applications
Fully typed React applications with typed props, hooks, context, and API responses. Refactoring a typed React codebase is dramatically safer than refactoring plain JavaScript.
TypeScript Node.js Backends
Express and NestJS backends with typed request/response objects, database query types, and shared interfaces. API contracts between frontend and backend enforced at compile time.
Shared Type Libraries
Monorepo type packages shared across frontend and backend, one source of truth for API contracts, domain models, and validation schemas. No more frontend/backend type drift.
JavaScript to TypeScript Migration
Migrating existing JavaScript codebases to TypeScript incrementally, adding types file by file, tightening strictness over time, without rewriting the whole application at once.
The investment that pays back every sprint after the first
TypeScript adds upfront cost, writing types, fixing type errors. The payback is faster refactoring, fewer runtime bugs, and onboarding new developers in days instead of weeks.
Bugs caught at compile time
Null pointer exceptions, wrong property names, missing function arguments, type mismatches, TypeScript catches these before they reach your CI pipeline. We see a measurable reduction in runtime errors on typed projects.
Refactoring becomes safe
Rename a function or change an API response shape, TypeScript shows you every callsite that needs updating. In large JavaScript codebases, the same change requires grep + manual verification + hoping you didn't miss anything.
Better developer experience
IDE autocompletion, inline documentation, go-to-definition, and automatic import organisation all depend on types. TypeScript makes the development environment significantly more useful.
Industry standard
TypeScript is the default for professional JavaScript development. React, Angular, Vue, NestJS, Next.js, all TypeScript-first. Hiring TypeScript developers is easier than hiring for a team that insists on plain JavaScript.
Hire a TypeScript Developer
Skip the full build. Get a vetted TypeScript developer working inside your existing team, on your stand-ups and your roadmap.
Hire a TypeScript Developer →When should you choose TypeScript?
TypeScript adds upfront cost, writing types, fixing type errors. For almost every production project, the payback is worth it.
TypeScript makes sense when
- More than one developer will touch the codebase over its lifetime
- The application will be maintained and extended past the first release
- You want IDE autocompletion, safe refactoring, and fewer runtime surprises
Consider plain JavaScript when
- It's a genuinely throwaway script or one-off automation
- Build tooling overhead needs to stay at an absolute minimum
- The team has no TypeScript experience and the timeline can't absorb the ramp-up
Built by AI-native engineers, so your TypeScript app is ready for AI features from the start
Streaming responses, assistant panels, and agent-driven UI need the frontend designed for them from the first sprint, not retrofitted. It is how our own products, Tully AI and Mebag, were built.
Token-by-token rendering, cancellation, and retry handled in the component layer, not bolted on later.
Chat surfaces, tool-call previews, and human-in-the-loop approvals built as reusable TypeScript components.
Prompt versioning, evals, and guardrails on the backend the TypeScript app talks to, so AI features stay predictable.
See how we build AI into real products. Our AI development →
Common questions about TypeScript development
Straight answers on stack fit, working in your codebase, cost, and how we start.
Is TypeScript worth the overhead for a startup moving fast?
Yes, even for MVPs. The overhead is front-loaded and small. The benefits compound. We've seen TypeScript projects where a junior developer caught a critical bug in code review because TypeScript highlighted an API contract mismatch. That one catch justified the investment for the entire project.
Can you migrate our existing JavaScript codebase to TypeScript?
Yes, we do this incrementally. TypeScript allows mixed JS/TS codebases, so we can migrate file by file, tightening strictness as we go. We start with the highest-risk files (API layers, business logic, shared utilities) rather than doing a big-bang migration.
Do you use strict mode TypeScript?
Yes, strict mode by default. noImplicitAny, strictNullChecks, and the full strict suite enabled from the start. Loose TypeScript often gives false confidence, you still get null pointer errors, just with extra steps. We'd rather deal with the type errors up front.
What tools do you use with TypeScript?
Zod for runtime validation and type inference from schemas. ESLint with TypeScript plugin for code quality. Vitest or Jest for typed tests. tRPC for end-to-end type safety across the API boundary when the stack allows. Prisma for typed database queries. The ecosystem is rich.
Hire TypeScript Developers
Need TypeScript engineers embedded in your team rather than a full project handoff? Our TypeScript Developers join your existing workflow (your tools, your stand-ups, your roadmap) while we handle employment, payroll, and HR. Add one developer or a full team, scale up before a release and back down after, and keep everything they build.
Building with TypeScript, or should be?
We've used it on every project for 8 years.
Tell us what you're building. Whether it's a greenfield TypeScript project or migrating an existing JS codebase, we'll scope it honestly.