National Renewable Energy Lab Software Engineer interview questions

4.5 Hour interview with a 40min presentation up front about personal project. Interview was quite in depth but all fairly reasonable. The actual research team was lovely to talk to and the interview flew by. Even without an offer, it was good experience. Thw downside comes from hiring managers. They couldn't be bothered to offer feedback or even a short rejection notice. After demanding such a large amount of prep work and an entire half a work day, failure to contact applicants about outcomes both positive and negative is absolutely unacceptable and downright rude. Followed up twice as instructed by interview team and no response either time.