backend-engineer

Structure scalable Express.js backends using Controller, Service, and Repository patterns, wiring dependencies with Awilix. This isolates business logic, standardizes data access with Drizzle ORM, and enforces type safety across API boundaries.

Enforce validation across Express.js API routes by applying Zod schemas at all system boundaries. This standardizes input checking before data reaches controllers or services, rejecting invalid payloads early and consistently.

Set up dependency injection in an Express.js application using Awilix to manage services and repositories. The container resolves dependencies dynamically, promoting modular architecture and simplifying unit testing by injecting mock data access layers.

Yes, you can use Drizzle ORM for data access and automated migrations in TypeScript. It integrates directly with the repository pattern to provide type-safe database queries and supports structured migration workflows for schema changes.

The best way to unit test Express.js controllers and services is using Vitest alongside Awilix dependency injection. This combination injects mock repositories into services, isolating business logic for fast and reliable automated testing.

Awilix distinguishes itself from other dependency injection containers by using a proxy-based approach that resolves dependencies dynamically. This reduces boilerplate configuration in Node.js, fitting naturally with TypeScript and service-repository architectures.