Palantir FDSE internship interview: every published step, what interns report, and how to prep

By FDE Interview Prep, a SourceStrongAI company

In this post10 sections

1. The steps Palantir publishes for students and early talent
2. The coding challenge and the technical interview
3. The learning round: what interns describe
4. The decomposition round for interns
5. The hiring manager interview and what can come after it
6. What the internship involves: on-site work and travel
7. A prep routine for students, round by round
8. Questions people ask
9. Keep reading
10. More from the blog

You applied for Palantir’s forward deployed software engineer (FDSE) internship, and the recruiter’s email names rounds your LeetCode list never mentioned: “learning” and “decomposition”. Palantir publishes its early-talent steps, and intern candidates have filled in what happens inside them. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page Below: each step, what interns report, and a prep routine; for FDE rounds beyond the internship, read the FDE interview guide.

The short answer: Palantir’s Students and Early Talent timeline lists six steps: a HackerRank coding challenge, a 30-minute chat with a technical recruiter, a 30-45 minute technical interview, a virtual onsite, a hiring manager interview and an offer. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page The onsite is two one-hour interviews, learning and decomposition, with behavioral and technical questions. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page Intern reports fill in the detail, but they differ by year and office, so practice each type of round rather than memorizing one sequence.

The steps Palantir publishes for students and early talent

Palantir’s careers page for students carries a graphic titled “Students and Early Talent Application Timeline”. Here is what it lists, step by step.

Now one intern’s version of the same loop. In an August 2022 Medium post, one candidate for the Sydney FDSE internship described 5 written application questions, a 75-minute HackerRank test with 3 questions, a 60-minute Karat interview that could be retaken, a 30-minute recruiter call, and two 1-hour technical interviews, then a rejection. ^[2]Source 2Interviewing at Palantir Technologies : FDSE InternshipPublisherMedium (Meghna Dutta)Source typecandidate’s personal write-up That is one account from one office in one year: an example, not a template.

Two things to know before you plan your prep:

• FDSE and SWE are different processes. Palantir’s students page says the interview process varies based on whether you are most excited about the Forward-Deployed Software Engineer role or the Software Engineer role. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page Prepare for the one you applied to.
• The order can change. A poster applying for the FDSE internship wrote, in August 2026, that after the recruiter call they were moved on to a learning interview, when they had seen that the recruiter screen was followed by a LeetCode-style technical interview, and asked whether that order was normal now. ^{[3, 4]}Source 3Palantir FDE Commercial Delta Interview (post by u/Popular_Elephant_349)PublisherReddit r/csMajorsSource typecandidate report on RedditSource 4Palantir FDSE Intern Learning Interview (post by u/Realistic-Major9132)PublisherReddit r/csMajorsSource typecandidate report on Reddit They wrote before taking the round.

Older reports show how much the loop has moved. A Glassdoor reviewer who called the role an internship described, in December 2016, an onsite with two technical interviews and one decomposition in the morning, a lunch with an engineer that “turned into another decomposition”, and a hiring-manager interview that afternoon. ^[5]Source 5Palantir Technologies Forward Deployed Software Engineer Interview Questions (archived)PublisherGlassdoor (archived by the Wayback Machine)Source typecandidate’s personal write-up It tells you not to trust any single account, including the Sydney one. Our lesson on reading employer pages and candidate reports shows how to weigh each kind of source.

The coding challenge and the technical interview

The first two technical steps are the closest to a standard software engineering screen. Palantir’s timeline calls the HackerRank a coding challenge and the interview after the recruiter chat a “purely technical interview with a Palantir engineer”. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page

What people report about them:

• The HackerRank. The Sydney candidate’s Medium post describes 3 coding questions in 75 minutes. ^[2]Source 2Interviewing at Palantir Technologies : FDSE InternshipPublisherMedium (Meghna Dutta)Source typecandidate’s personal write-up
• A coding round. A Blind commenter replying to a post about a Palantir FDSE onsite, in December 2024, wrote that coding is “mostly leetcode” and that they got a LeetCode medium, tree-type problem. ^[6]Source 6Palantir FDSE OnsitePublisherBlind (teamblind.com)Source typecandidate report on Blind They did not say which step it was, did not name the company or role themselves, and said their advice applied only to intern and new-grad interviews.

So practice the standard material: arrays, hash maps, trees, graphs, and the medium-difficulty problems that combine them. Then practice talking while you do it. Palantir’s recruiting blog, in an August 2022 post for intern and new-grad candidates, advised thinking out loud in the technical interview and sharing questions and observations so interviewers can see how you approach the problem. ^[7]Source 7From Pipeline to Prospect: Insights and Advice from Palantir Recruitment (Palantir Blog; archived copy)PublisherPalantir Technologies (Palantir Blog on Medium)Source typearchived company page

What that sounds like in the first minute of a tree problem. Say it is the diameter of a binary tree:

“Before I code: can the tree be empty, and do we count the path in edges or nodes? I’ll assume it can be empty and we count edges. My first idea is a depth-first walk that returns each node’s height and updates the best diameter as it goes. Let me check that on a three-node example before I write it.”

Common mistakes, and the fix for each:

• Coding in silence for five minutes. Say the approach in one sentence before you type, then narrate each decision.
• Skipping the edge cases until the end. Name the empty input and the one-element input first, out loud.
• Treating it as the whole loop. It is one of the six steps on Palantir’s timeline. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page Give the learning and decomposition rounds at least as much practice as coding.

Our lesson on what FDE coding rounds test covers the other coding formats FDE loops use.

The learning round: what interns describe

This round has no LeetCode equivalent: you are taught something, then asked to use it. What intern candidates describe:

• New concepts from documentation. The Sydney candidate wrote on Medium that the round asked them to learn new concepts with the help of documentation and solve 4 problems of increasing difficulty. ^[2]Source 2Interviewing at Palantir Technologies : FDSE InternshipPublisherMedium (Meghna Dutta)Source typecandidate’s personal write-up
• A concept, then small query functions. One commenter wrote, in August 2026, that the interviewer first taught a technical concept and a scenario, then showed object-oriented code with a function for querying an imaginary database, and that they wrote a series of small query functions they did not have to run, which the interviewer checked for correctness. ^[8]Source 8Palantir FDSE Intern Learning Interview (comment by u/Illustrious_Beat4472)PublisherReddit r/csMajorsSource typecandidate report on Reddit They posted in an r/csMajors thread titled “Palantir FDSE Intern Learning Interview”, and did not name the company or the role themselves.
• Shorter answers. The December 2024 Blind commenter wrote that learning problems tend to be shorter-response questions, again speaking only of intern and new-grad interviews. ^[6]Source 6Palantir FDSE OnsitePublisherBlind (teamblind.com)Source typecandidate report on Blind

You cannot study the content in advance. You can rehearse the process, and the Sydney account gives the shape: documentation first, then problems that get harder. Here is a drill we wrote in that shape; it is our practice material, not a Palantir question.

Step 1: read the docs aloud. Your “interviewer” hands you this excerpt:

Store(rows)   rows: a list of dicts
store.query(where=None, fields=None)
  where:  a function row -> bool;
          keeps rows where it is True
  fields: a list of keys; each result
          keeps only those keys
  Returns a list. No sorting,
  grouping or joins.

Each row is a maintenance work order with id, site, status, opened and title. Read the excerpt out loud and restate it: “So query filters with a predicate, then projects fields. It never sorts or groups, so grouping is mine to write.”

Step 2: four tasks, in rising difficulty.

1. The titles of all open orders.
2. How many orders are open at the site called north.
3. The count of open orders per site.
4. The id of the oldest open order per site.

The first two are one call each. The first is where you show you read the fields line:

is_open = lambda r: r["status"] == "open"

[r["title"] for r in store.query(
    where=is_open, fields=["title"])]

len(store.query(where=lambda r:
    is_open(r) and r["site"] == "north"))

The third is the first one the docs do not solve for you, because query does not group:

counts = {}
for r in store.query(where=is_open,
                     fields=["site"]):
    counts[r["site"]] = counts.get(r["site"], 0) + 1

The fourth keeps the best row per site as it walks:

def oldest_open_by_site(store):
    oldest = {}
    for r in store.query(where=is_open):
        best = oldest.get(r["site"])
        if best is None or r["opened"] < best["opened"]:
            oldest[r["site"]] = r
    return {s: r["id"] for s, r in oldest.items()}

That comparison is only safe if opened is an ISO string like 2026-03-09 or a Python date object; both compare correctly with <, as the Python datetime docs say for dates. A US-style string like 03/09/2026 does not: compared as text, 01/15/2027 comes before 03/09/2026. Nobody will run your code to catch it, so say the assumption out loud.

The moves that matter more than the code:

1. Restate what you were taught before you write anything.
2. Ask for one example. “Can I see one row, so I know opened looks like 2026-03-09 and not 03/09/2026? ISO strings and date objects both compare correctly; US-style strings do not.”
3. Solve the first task fully before touching the second. A correct small answer beats a clever half answer.
4. Reuse what you built. Every task starts from the same open-order filter. Say so.

The sibling post on the Palantir learning interview goes deeper on this round, with more practice formats.

The decomposition round for interns

Decomposition is the open-ended round: a broad problem you break into parts and a first version. Palantir’s page on open-ended questions gives one piece of advice: articulate the alternatives and trade-offs, be pragmatic enough to arrive at a concrete approach, and deliver a functioning idea first, then expand it. ^[9]Source 9Palantir Careers | Navigating Open-Ended QuestionsPublisherPalantir TechnologiesSource typecompany hiring page For the round in full, read the decomposition interview guide.

What intern candidates report:

• An abstract design problem. The Sydney candidate’s Medium post describes one of the two onsite interviews as an abstract, system-design-style problem. ^[2]Source 2Interviewing at Palantir Technologies : FDSE InternshipPublisherMedium (Meghna Dutta)Source typecandidate’s personal write-up
• Study advice from the Blind commenter. For decomp, the Blind commenter advised studying the system design primer and practicing clarifying questions and going from a list of requirements to a data model. ^[6]Source 6Palantir FDSE OnsitePublisherBlind (teamblind.com)Source typecandidate report on Blind That is advice on what to study, not a description of the round.

We teach decomposition as a six-step method: clarify, name stakeholders and metrics, list inputs, sequence workstreams, build a walking skeleton, then name failure modes. It is our scaffold for thinking aloud, not Palantir’s rubric. Here is the opening of a student-sized prompt, in words you can say:

Interviewer: “A university’s dining halls throw away too much food. How would you help?”

You: “Who is asking, the dining manager or the sustainability office? And is ‘too much’ measured today, by weight or by cost?”

You: “I’ll assume the dining manager, measured by weight at the end of each service. Then success is less food thrown away without more students leaving hungry.”

Then turn requirements into a data model, which is the step the Blind commenter singled out:

MenuItem(id, name, hall_id, portion_kg)
Service(id, hall_id, date, meal)
Prepared(service_id, item_id, portions)
Wasted(service_id, item_id, weight_kg)
RanOut(service_id, item_id, time)
Swipes(service_id, count)

RanOut is the guardrail: it is how you would know students left hungry. Say the definition out loud: “Over-prepared means wasted kg divided by portion_kg is high while RanOut stays empty.”

Then sequence the work by risk: “The riskiest unknown is whether halls weigh waste consistently, so week one is a scale at two halls.” Then propose a first version you could ship: a daily report of the items most often over-prepared, per hall, per meal, and what could break it, such as a holiday week that looks like a trend.

Then close in four parts: the problem, the first version, the biggest risk and what you would do on Monday.

You: “To close: the waste is over-preparation at a few meals; the first version is a daily over-prep report; the biggest risk is unweighed waste; on Monday I’d ask for last term’s production sheets.”

Mistakes to avoid:

• Designing before asking. Two clarifying questions first, every time.
• Drawing a platform. Name the smallest thing that works, then grow it.
• Staying abstract. Name the tables, one interface and a rough data volume.

Our free lesson on the open-ended round and the method on one page runs the whole method on a case. Then try building a feature from event data, which is free with a model answer.

The hiring manager interview and what can come after it

Palantir’s timeline says the hiring manager meeting is customized based on your onsite feedback. ^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page Our read: expect questions that probe whatever the onsite left open, and prepare a clear answer to why you want forward deployed work rather than product engineering. A three-sentence skeleton of our own:

1. A problem you liked solving with a non-engineer. “On my club’s ticketing app, the treasurer’s spreadsheet was the real spec, and fixing it with her was the best week of the project.”
2. Why you want that weekly. “I want that loop every week: sit with the user, find the real problem, ship a fix.”
3. What you want to learn on a customer site. “I want to learn how a large organization’s data actually flows, from the people who run it.”

That question is not idle. For the New Grad FDSE role, not the internship, Palantir’s application asks candidates to confirm they want FDSE rather than Software Engineer, and to answer short prompts such as a time they changed their mind. ^[10]Source 10Apply: Forward Deployed Software Engineer, New Grad - Commercial (New York, NY) - Palantir on LeverPublisherPalantir Technologies (Lever)Source typecompany job posting For the full model answer, practice with Why FDE and not software engineering?, which is free.

Two candidates reported, in September 2026, steps that Palantir’s timeline does not show. ^{[11, 12]}Source 11Palantir On-Site(DC) FDSE Internship (post by u/Darealest49)PublisherReddit r/csMajorsSource typecandidate report on RedditSource 12Palantir FDSE security clearance call (post by u/BeefyBoiCougar)PublisherReddit r/cscareerquestionsSource typecandidate report on Reddit

• An in-person step. One candidate reported an invitation to a Palantir office in Washington, D.C. for the FDSE internship, which the email called “expedited next steps”: a few hours of interviews, demos and meeting the team. ^[11]Source 11Palantir On-Site(DC) FDSE Internship (post by u/Darealest49)PublisherReddit r/csMajorsSource typecandidate report on Reddit They posted before going.
• A clearance call. A second candidate reported that about a week after their final round for a Palantir FDSE (US Gov) internship, they got a call asking whether they wanted to start the security clearance process, before any offer. ^[12]Source 12Palantir FDSE security clearance call (post by u/BeefyBoiCougar)PublisherReddit r/cscareerquestionsSource typecandidate report on Reddit

If you applied to a government team, ask your recruiter early what clearance steps apply to you.

What the internship involves: on-site work and travel

Palantir describes the FDSE internship as customer-site work, not a desk at headquarters. A March 2023 post on Palantir’s blog said its FDSE interns generally work on-site at customer locations, solving problems hand-in-hand with customer personnel. ^[13]Source 13How to Get an Internship at Palantir (Palantir Blog)PublisherPalantir BlogSource typecompany blog

Palantir’s New Grad FDSE postings, which are for full-time roles rather than internships, say to expect 25–50% travel (Commercial) or that 25-50% travel is preferred (US Government), varying by team and location. ^{[14, 15]}Source 14Forward Deployed Software Engineer, New Grad - Commercial (New York, NY)PublisherPalantir TechnologiesSource typecompany job postingSource 15Forward Deployed Software Engineer, New Grad - US Government (Washington, D.C.)PublisherPalantir TechnologiesSource typecompany job posting If you are thinking past the internship, that is what the full-time postings describe.

Team names have changed over the years, so read the current posting and ask which customers the team serves. Our lesson on travel, location and on-site time lists the questions to ask.

A prep routine for students, round by round

This routine is ours. It follows the steps Palantir publishes, and it trains each type of round, so a change of order does not throw you.

For more on the whole FDSE loop across levels, see what Palantir FDSE candidates report, and for the full-time path, new-grad forward deployed engineer roles.

The decomposition round is the hardest to practice alone, because nobody answers your clarifying questions. The free practice case gives you an AI customer who holds back facts until you ask, on a 10-minute clock.

The question bank holds 180 interview questions with model answers. Pro opens all of them, along with the rest of the lessons.

Questions people ask

What steps does Palantir list for its early-talent interview process?

Palantir’s Students and Early Talent timeline lists a HackerRank coding challenge, a 30-minute chat with a technical recruiter, a 30-45 minute technical interview, a virtual onsite, a hiring manager interview and an offer. Its careers page says the process varies depending on whether the role is Forward-Deployed Software Engineer or Software Engineer.^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page

What happens in the Palantir FDSE intern virtual onsite?

Palantir’s early-talent timeline describes the virtual onsite as two one-hour interviews, learning and decomposition, with behavioral and technical questions, followed by a hiring manager interview customized based on onsite feedback.^[1]Source 1Students | Palantir Careers (timeline image: RecruitingTimeline_V3.jpg)PublisherPalantirSource typecompany hiring page

Do Palantir FDE interns work at customer sites?

A Palantir blog post says its Forward Deployed Software Engineering interns generally work on-site at customer locations, solving problems with customer personnel. Ask your recruiter what that means for the team and office you are applying to.^[13]Source 13How to Get an Internship at Palantir (Palantir Blog)PublisherPalantir BlogSource typecompany blog

Keep reading

Guides

• The forward deployed engineer interview, round by round
• The decomposition interview: how to break down a vague customer problem

Company guides

• Palantir

Lessons

• The FDE decomposition interview: the method on one page
• What FDE coding rounds test, by the evidence
• The evidence map: what employers publish, what candidates report, how to read both
• Travel, location and on-site time: read the posting, then ask

Questions

• Here is a table of events from a fitness app. Pick one feature to build from it and scope it to something you could ship in two weeks.
• A city transit agency says its buses are unreliable and riders are leaving. You have a week with their team. How do you approach it?
• Why forward deployed engineering, and not a software engineering role?

More from the blog

1. Company loops

   Palantir FDSE interview experiences: what Palantir publishes and what candidates report

   Palantir says its interview format is personalized. Its published outline beside dated FDSE candidate reports, and the round types to prepare for.

   11 min readPublished September 2026

2. Company loops

   Palantir Build to Apply: how to build and film the demo Palantir asks for

   Palantir’s Build to Apply postings want a Foundry and AIP project and a short demo video. Who can apply, how to get set up, and how to build and film it.

   11 min readPublished September 2026

3. Company loops

   C3 AI’s AI screening interview and the coding rounds candidates describe

   Two candidates report C3 AI’s FDE process opening with an AI interview, then coding and system design. What it asks and how to prepare for each step.

   10 min readPublished September 2026

More in Company loops