Building embedded systems is complex, especially if they will last. This talk will be a collection of (funny!) cases and stories of errors made in different projects. Examples cover a wide range of situations, for example, not using git at all (or poorly) or optimizing too early. Marta will also show best practices to follow instead and how to convince customers and coworkers actually to follow those practices. The talk applies to an intermediate audience, but experts could also find a suggestion or two.