Testing in today's world: Functional tests aren't as costly or inefficient as they used to be, but unit tests are crucial for large code bases. Both are important for building reliable software.

Implementing maintenance toggles for apps allows manual control over traffic, saving time in troubleshooting & reducing production impact. Flip the switch & divert traffic to another zone while instances stay up & running!

Reserve dedicated time for one-to-ones & let mentee steer conversation, being objective is key. Also, seize day-to-day interactions as opportunities to teach & share 'why' behind suggestions.