Uncle Bob’s (Robert C. Martin) awesome video series on clean coding, TDD, SOLID principles & design patterns should be part of the bible for any software engineer. Endless repetition and extremely nerdy role play helps to drive his point home. Highly recommend to host regular Uncle Bob sessions in your development team and discuss the insights. Specifically, focus on these video series:

• Clean Coding, all about how to write code you can share with a team.
• TDD, how to write tests, why tests matter in the first place, and TDD.
• SOLID principles to architect reusable and maintainable code.
• Component Design, bringing architecture principles to the next level.