Nubank faced challenges with its external logging vendor as it scaled, leading to high costs and limited control. The engineering team built an in-house logging platform in two phases, focusing on ingestion and storage, to enhance reliability, scalability, and cost efficiency.

Character.AI has transformed its fragmented logging system into a centralized one, significantly improving query speeds and enabling real-time visibility for developers. By selectively capturing logs and introducing new features like live tailing and keyword search, the company aims for metric unification to enhance observability and support future growth.