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

Frontend Engineer • Coding • hard

Implement a virtualized list component from scratch in React. It should take an array of items, a row height, and a viewport height, and only render the visible DOM nodes.

#React #DOM Manipulation #Math
Practice
Frontend Engineer • Coding • medium

Write a function to deeply merge two complex JSON objects representing user configurations. If there are conflicts, resolve them based on a provided timestamp property.

#Recursion #Data Structures #JavaScript
Practice
Frontend Engineer • Coding • medium

Implement a custom React hook `useDebounce` and use it in an autocomplete search input component that fetches data from a mock API.

#React Hooks #Asynchronous JavaScript #API Integration
Practice
Frontend Engineer • Coding • medium

Given a flat array of ontology nodes with `id` and `parentId` properties, write a function to build a nested tree structure and render it as a collapsible file explorer in React.

#Trees #Recursion #React
Practice
Frontend Engineer • Coding • medium

Implement a rate limiter in the browser to batch and throttle analytics events before sending them to the server. Ensure no events are lost if the user closes the tab.

#JavaScript #Browser APIs #Queues
Practice
Frontend Engineer • Coding • hard

Write a utility to parse and evaluate a custom boolean search query string (e.g., 'status:active AND (role:admin OR role:user)') against an array of JavaScript objects.

#Parsing #AST #String Manipulation
Practice
Frontend Engineer • Coding • hard

Create a React component that renders a large canvas map and allows users to draw a bounding box with their mouse to select data points.

#Canvas #Event Handling #Math
Practice
Frontend Engineer • Coding • medium

Implement a memoized selector function (similar to Reselect) to efficiently compute derived state from a large Redux store.

#Memoization #Functional Programming #State Management
Practice
Frontend Engineer • Coding • medium

Write a function to detect circular dependencies in a directed graph representing UI components and their data dependencies.

#Graphs #DFS #Algorithms
Practice
Frontend Engineer • Coding • hard

Implement a drag-and-drop interface for a Kanban board using only native HTML5 Drag and Drop APIs, without external libraries.

#DOM APIs #Event Handling #React
Practice

Difficulty Radar

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Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

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

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Unwritten Rules

Think Out Loud

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

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