---
title: "Production-grade TypeScript"
description: "Michael Arnaldi defines production-grade software through reliability, observability, testability, and maintainability."
group: concept
terms:
  - "production-grade TypeScript"
  - "production-grade software"
sources:
  - https://youtu.be/apklpPEgZgw?t=205
  - https://youtu.be/BqUnsDnMnMo?t=1357
---

# Production-grade TypeScript

Michael defines production-grade software as long-lived software that remains resilient, observable, testable, predictable, modular, and approachable. [CityJS, 03:25](https://youtu.be/apklpPEgZgw?t=205) [06:57](https://youtu.be/apklpPEgZgw?t=417).

He demonstrates Effect context, Schema, spans, metrics, and retry policies in a Remix application. [Effect Meetup SF, 22:37](https://youtu.be/BqUnsDnMnMo?t=1357) [30:34](https://youtu.be/BqUnsDnMnMo?t=1834).

See [Effect: Production-Grade TypeScript](/lore/cityjs-effect-production-grade-typescript-michael-arnaldi).