Palantir Interview Questions: The Process and the Decomposition Interview (2026)

The short answer: Palantir’s process starts with one or two phone interviews of 20 to 45 minutes, then an onsite (in person or virtual) with more of the team. Engineering candidates get coding questions, and many candidates face an open-ended problem, which Palantir calls navigating open-ended questions and candidates often call the “decomposition” interview. Palantir publishes guides to the competencies it tests: writing good code, analyzing code efficiency, open-ended questions, solving technical problems and working inside existing systems. To prepare, practice breaking big, messy problems into parts out loud, prepare stories about what you’ve built and where you’ve failed, and have a specific answer to “Why Palantir?”.

How the process works

From Palantir’s own “Getting Hired” guides:

• It’s tailored. “The number and format of interviews that you’ll go through will be personalized to your skillset and the type of role that you’re looking for.”
• Phone interviews first. “Our interview process begins with one or two phone interviews, typically lasting 20 to 45 minutes each.” Expect to talk about your background, experience and interest in Palantir. Engineering candidates also get “a technical question that focuses on your coding abilities,” sometimes in HackerRank or Google Docs.
• Then the onsite, in person or virtual, where you meet more members of the team.
• A quick decision. Palantir says it typically gets back to candidates “a week or two at the latest” after a phone interview.

Common roles include Forward Deployed Software Engineer, Software Engineer and Deployment Strategist. The mix of interviews depends on the role, so ask your recruiter what to expect.

The competencies Palantir tests

Palantir publishes a guide for each:

The decomposition (open-ended) interview

Palantir describes this competency as the ability to tackle problems “with multiple possible solutions that will incur different trade-offs.” Its advice: “articulate the alternatives and trade-offs, but don’t forget to be pragmatic enough to be able to arrive at some concrete approach. Deliver a functioning idea first, then expand it afterwards.”

A method that works

1. Clarify the goal and the users. Who has the problem, and what does success look like?
2. Break the problem into parts. Data, workflows, users, constraints.
3. Propose a simple working version that solves the core problem.
4. Discuss trade-offs between alternatives: speed, accuracy, cost, privacy, ease of use.
5. Expand: scale, edge cases, what you’d measure, what could go wrong.

Think out loud throughout. Palantir’s guide says interviewers want you to “talk through how you plan to approach the problem and ask questions if necessary.”

Worked example

An illustration of the approach, not an actual Palantir question.

Question: “A regional hospital network keeps running out of ICU beds during flu season. How would you help?”

1. Clarify: Who decides where patients go: bed managers, doctors, transfer centers? Is the goal fewer transfers, shorter waits, or fewer canceled surgeries? What data exists?
2. Break it down: current bed availability, predicted demand, staff availability, transfer logistics, and the decision workflow.
3. Simple version first: a shared, live view of available ICU beds and staffed capacity across hospitals, updated from existing systems, so bed managers can place patients faster.
4. Trade-offs: a simple dashboard now versus a demand forecast later; accuracy of manual updates versus the effort of system integration; patient privacy in shared views.
5. Expand: add forecasts from admissions trends, alerts when capacity drops below a threshold, and track whether time-to-bed improves.

The interviewer will push back and change constraints. That’s the point: they want to see how you adjust.

How to practice

Palantir’s own advice is to “Build things — real things that solve real problems,” and to take an app you use and think about the problem it solves and the technical challenges its developers faced. Practice open-ended problems out loud with a friend and have them interrupt you with new constraints.

Behavioral questions and “Why Palantir?”

Palantir says it will ask about “how you’ve executed, challenged yourself, motivated others, and made judgments—as well as where you’ve failed in the past.” It also wants to know what you’re passionate about. Prepare stories for:

• Something difficult you built or delivered
• A time you took on something beyond your experience
• A time you persuaded or motivated others
• A judgment call with incomplete information
• A failure and what you learned. See tell me about a time you failed.

Use the STAR method. For “Why Palantir?”, be specific about the kind of problems or customers you want to work on and why, and connect it to your own experience. See why do you want to work here.

Coding interviews

Palantir’s phone interview tips for engineers: think out loud, don’t be afraid to ask questions, and start simple and then expand. Practice standard data structures and algorithms, explain the efficiency of your solution, and write code that’s clear enough for someone else to maintain. Also practice reading and changing unfamiliar code, since working inside existing systems is one of the competencies Palantir tests.

Frequently asked questions

Sources

• Palantir, Getting Hired. Read on 30 September 2026.
• Palantir, The Phone Interview. Read on 30 September 2026.
• Palantir, Navigating Open-Ended Questions. Read on 30 September 2026.
• Palantir, Working Inside Existing Systems. Read on 30 September 2026.