I went through the Palantir product designer loop over about six weeks earlier this year. Long process. Here is everything I wish I had known going in.
Background: I'm a staff-level designer with a mix of enterprise SaaS and consulting. I was interviewing for a senior product designer role on a Foundry product team.
The process: Recruiter screen. Design challenge take-home (more on this below). Portfolio review with two designers. Onsite with four people: another designer, a PM, an engineer, and a cross-functional design critique.
The take-home design challenge: They gave me a hypothetical problem: something like "design a way for a user to understand how data was transformed as it moved through a pipeline, without technical knowledge of the underlying system." Two-week window. They wanted a clear problem framing, evidence of user research thinking (even if hypothetical), and medium-fidelity wireframes with reasoning.
Do not over-design the visuals. I saw advice to make it pixel-perfect and I disagree. They responded to the thinking more than the polish. The one critique I got was that I'd jumped to a solution before fully documenting competing approaches.
The portfolio review: Bring 2-3 projects where you can talk about the full arc: business problem, constraints, research methods, design decisions, iteration, outcome. They really pressed on constraints, especially what you cut and why. One question I got: "where in this project did you make a design decision that another designer might have made differently, and why did you choose your direction?"
The design critique round: They showed me an existing interface and asked for feedback. Be honest. Don't compliment your way around real issues. They know the interface has problems.
What Palantir design actually does: Mostly enterprise data visualization and complex workflow design. If your background is consumer apps with small surface areas and you've never thought about information density, data provenance, or power-user workflows, that's a gap.
Comp: 240-270k total for senior designer, NYC or Palo Alto. Q2 2026.