Is there a technical solution you implemented that you now consider incorrect?

Yes, in my practice there have been solutions that over time seemed inefficient or incorrect to me. For example, once I implemented a complex custom integration between modules of an ERP system, using many intermediate tables and complex scripts for data synchronization. This solution worked, but was difficult to maintain and scale.

Later, I realized that it would have been better to use standard data exchange mechanisms and event-driven architecture, which would have simplified maintenance and increased reliability. This experience taught me the importance of choosing simple and standard solutions, as well as the need to carefully evaluate the long-term impact of architectural decisions.