During his Codecamp Romania 2025 Masterclass, J. B. Rainsberger answered some questions about software design.

Here are four lightning talks in which he addresses these topics:

1. When not to do TDD and one surprising disadvantage for experienced TDD practitioners.
2. How Client-First Design addresses one of the common shortcomings of naively allowing designs to evolve from the ground up.
3. Adding safety to refactoring without assuming that adding tests is enough or indeed the best choice.
4. Two kinds of refactoring activities and how to communicate the need for each of these to non-programmer members of your project community.