The recruiter was very nice, and the company is overall very energetic.

I had one recruiter phone screen and one phone technical interview, followed by an onsite interview of five rounds. The questions were pretty straightforward, and I solved them quickly. However, they told me after two days that I hadn't performed well enough in coding and algorithms.

Some of the interviewers were very friendly, but others seemed very tired and were not very responsive in conversation.

They want to ensure you're eager to join them, even though it's somewhat difficult to understand exactly why their products are important to their customers.

During the interview, I asked explicitly, and they confirmed that people at Palantir work harder than at other Silicon Valley companies, but the salary is not proportionally increased because they love the work.

I guess they'll hire you only if you can truly appreciate their products and culture and are fanatically passionate about the company.

Phone interview:

Same as what others have mentioned here. Find duplicates, find duplicates within distance k, find fuzzy duplicates within distance k.

Onsite interview:

• Running median, with follow-up questions about not using heaps and achieving constant space.
• Min Stack.
• Find top k numbers in a max heap.
• Design a UI for a file explorer on a webpage.
• Design a Twitter API, focusing on performance and scalability, without delving into technical details.
• Real coding on a laptop; the difficulty is not high, so don't worry about it.