TypeScript Development
We build production TypeScript applications across the stack — REST APIs, GraphQL services, serverless functions, and front-end applications. Type safety is not a feature we turn on; it is how we write code from the start.
Capabilities
What we build with TypeScript
Type-safe backends
REST and GraphQL APIs
Node.js APIs written in TypeScript with strict typing from request schema through database query and response serialization. Runtime validation with Zod matched to compile-time types so the contract holds at every layer.
Full-stack contracts
tRPC and End-to-End Type Safety
tRPC-based architectures where the API contract is defined once in TypeScript and enforced automatically on both the server and the client without code generation or schema files.
Lambda · Edge · Vercel
Serverless Functions
TypeScript serverless functions for AWS Lambda, Vercel Edge, and Cloudflare Workers. Strict tsconfig targeting the right runtime, with bundling configured to keep cold starts acceptable.
Developer tooling
CLI Tools and Scripts
Internal CLI tools, build scripts, and automation utilities written in TypeScript so they can be maintained by the same team and the same toolchain as the application they support.
JS → TS codebase conversion
Migration from JavaScript
Systematic migration of existing JavaScript codebases to TypeScript. We configure strict mode incrementally, type the critical paths first, and work through the remainder without blocking feature development.
Domain modeling
Type Architecture and Patterns
Designing the TypeScript type structure for a domain model: discriminated unions, branded types, utility types, and generic patterns that encode business rules in the type system rather than in runtime checks.
Our approach
Strict from the start
We configure tsconfig with strict mode, no implicit any, and strict null checks from the beginning of a project. Adding strictness to an existing codebase is significantly more work than starting strict. The short-term friction of strict types pays back repeatedly as a project grows.
Runtime validation matches compile-time types
TypeScript types disappear at runtime. User input, API responses, and environment variables require runtime validation. We use Zod or a similar library to define schemas that serve as both the runtime validator and the TypeScript type source, so the two cannot drift apart.
Types should describe the domain
A type named UserData that is just an untyped object is no improvement over plain JavaScript. We design types that reflect the domain model: state machines with discriminated unions, branded types for IDs that should not be interchangeable, and generic utility types that are genuinely reusable.
Test configuration alongside application code
A TypeScript test suite with loose tsconfig settings can pass while the application fails. We configure the test environment with the same strictness as the application and run type checking as part of CI, not just linting.
All engineering work is done by US-based engineers. We do not offshore any development or architecture work.
Part of our software engineering services. We work across the full stack, cloud platforms, and architectural patterns.
FAQ
Common questions
Virginia · United States
Need TypeScript expertise?
If you are starting a new TypeScript project or need help with an existing one, reach out and we will discuss the scope and approach before any work begins.