---
title: Overview
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---

Twenty primarily uses NestJS for the backend. 

Prisma was the first choice as the ORM with a lot of auto-generated code under the hood. But to offer users flexibility and allow them to create custom fields and custom objects, something more low-level than Prisma made more sense to have more fine-grained control. This is why the project now uses TypeORM. 

Here's what the tech stack now looks like. 

## Tech Stack

**Core**
- [NestJS](https://nestjs.com/)
- [TypeORM](https://typeorm.io/)
- [GraphQL Yoga](https://the-guild.dev/graphql/yoga-server)

**Database**
- [Postgres](https://www.postgresql.org/)

**Third-party integrations**
- [Sentry](https://sentry.io/welcome/) for tracking bugs

**Testing**
- [Jest](https://jestjs.io/)

**Tooling**
- [Yarn](https://yarnpkg.com/)
- [ESLint](https://eslint.org/)

**Development**
- [AWS EKS](https://aws.amazon.com/eks/)