Palantir

Palantir

Big data analytics company for defense, intelligence, and enterprise.

5 Rounds ~28 Days Very Hard
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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

Cloud Engineer • Coding • medium

Implement a Token Bucket rate limiter class in Python or Go. It should allow a specific capacity and refill rate.

#Rate Limiting #Concurrency #Object-Oriented Design
Practice
Data Engineer • Coding • medium

Design a key-value store with a Time-To-Live (TTL) feature. Once the TTL expires, the key should no longer be accessible and memory should be reclaimed.

#Hash Maps #Concurrency #Garbage Collection
Practice
Full Stack Engineer • Coding • hard

Implement an in-memory Key-Value store that supports standard GET, SET, and DELETE operations, as well as nested transactions with BEGIN, COMMIT, and ROLLBACK.

#Hash Map #Stack #System Design Fundamentals
Practice
Full Stack Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. Used for validating JSON-like configurations in Foundry.

#Stack #Strings
Practice
Full Stack Engineer • Coding • hard

Design a data structure that supports inserting a number and finding the median of all inserted numbers in O(1) or O(log N) time. This is used for real-time anomaly detection in sensor streams.

#Heaps #Design
Practice
Full Stack Engineer • Coding • medium

Implement an LRU (Least Recently Used) Cache. It should support get and put operations in O(1) average time complexity.

#Hash Map #Doubly Linked List #Design
Practice
Machine Learning Engineer • Coding • medium

Implement a key-value store with expiration times, similar to an in-memory cache used for fast feature retrieval in an ML pipeline.

#Hash Map #Doubly Linked List #Caching
Practice

Difficulty Radar

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The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

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Think Out Loud

Always explain your thought process before writing code or drawing architecture.

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