At what stages of career advancement does load balancing come into question?

The load balancing question usually becomes relevant at stages when a project transitions from a prototype to industrial operation and begins serving a large number of users. At the middle and middle+ specialist levels, it is important to understand the basics of scaling and load distribution to ensure system stability and performance. This includes configuring load balancers, optimizing queries, and monitoring the system. At higher career levels, this knowledge deepens and is applied to architectural decisions.