The Palantir Forward Deployed Engineer interview loop, round by round
The decomposition round is what fails people, not the coding.
Palantir calls it Forward Deployed Software Engineer. A recruiter call, a coding screen, then three of decomposition, learning, coding, re-engineering and system design, then the hiring manager. Behavioural is folded into every round rather than run on its own.
Who you meet
- Engineers
- A deployment lead
- Hiring manager
The rounds
1. Decomposition gating
What it grades
- Clarifying the problem before solving any of it
- Clean boundaries between sub-problems
- Edge cases and failure modes
- Movement toward a solution rather than arriving at one
The usual shape is a dataset plus a fuzzy goal: 8,000 London taxi records and "propose something buildable in a week", or a city cutting 911 response times from call, traffic and GPS data. Palantir publishes its own guidance for this under "Navigating Open-Ended Questions", which is worth reading precisely because they wrote it.
2. Coding and debugging
What it grades
- Ordinary data structures, not competitive programming
- Object-oriented graph search, reported as its own round
- Finding and fixing wrong results in a script you did not write
3. Learning round
What it grades
- How fast you absorb something unfamiliar
- Whether you can apply it immediately
Reported as unpreppable, and usually run back to back with decomposition. The only useful preparation is being willing to say "I do not know that yet, walk me through it" without losing composure.
4. Hiring manager
What it grades
- Ownership of a whole outcome
- Ambiguity
- Customer-facing judgment
Questions reported from this loop
- You have around 8,000 London taxi records with an id, fare, start and end location, start and end time, and distance. Propose an idea, draw the components, define the APIs, and code where it helps. It has to be buildable and deployable in a week.
- Your cousin drives for Uber Eats and can choose which orders to accept. He has all the historical and live order data, including past tips. Design something that helps him decide. Then design the other side: which order goes to which driver.
- A city wants to cut 911 response times using call records, traffic data and ambulance GPS. Where do you start?
- You are visiting another planet and need an application to log and catalogue the species you find.
- Lower-level variants of the same round: design a chess game, or a parking-lot management system.
- Here is a Python script with several functions. A few return the wrong results. Find them and fix them.
- Object-oriented graph search, run as its own round. Standard data structures rather than the hard end of LeetCode.
- The learning round: you are taught something unfamiliar during the interview and scored on how quickly you absorb and apply it.
- Why Palantir's specific customer problems, including the defence and civil-liberties dimension?
What is not on this page: the practice mapped to each round, and the list of what is not worth preparing for this loop. Both are in Rung.
Open this loop in Rung