Early NestJS projects should steer clear of over-architecting with intricate Domain-Driven Design patterns, CQRS with EventStore, and microservices decomposition before the application domain is properly validated. While NestJS's module system promotes good structure, it can lead to unnecessary complexity - begin with a simple module hierarchy and only create bounded contexts when team size or domain complexity makes it necessary. Also, avoid mixing multiple conflicting ORM libraries within the same project; pick either Prisma or TypeORM and use it consistently.
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