1. The first interview must not be a technical assessment — identify shared interests, look for collaboration opportunities. You need to understand if the person in front of you will be someone you would work with for the next 10 years, their current technical skills have little to do with this.
2. At the end of the first interview, right before the logistic questions, assess how they position in the junior-senior axis — either with direct questions or by pushing them to the topic. Once you‘ve done that ask an evil surgically difficult question — the correctness of the answer is not what you‘re looking for: pay attention to how they present their (eventual) missing knowledge, or how the address the answer by giving context. A senior developer doesn’t know everything, but must know enough to manage gaps in their knowledge.
3. Search for young and talented people — search for the fire in their eyes. You want someone which, eventually, will reach goals by their own.
