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Instacart Interview Question Bank

Instacart's recent SWE loop is dominated by CodeSignal-style practical coding: in-memory databases, worker/task trackers, expression parsing, file I/O, and product/inventory consistency. Senior loops now commonly split the onsite into two phases: two coding rounds plus a Karat AI codebase round first, then system design and project deep-dive if the first phase clears. MLE loops keep the same practical coding bar but add a fundamentals-heavy ML concept screen.

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Last updated 2026/7/20

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OA: In-Memory Key-Value Store

The dominant Instacart OA prompt. Implement an in-memory database where records are keyed by `key`, each record stores `field -> value` strings, and later levels add scans, prefix scans, timestamped reads, TTL, backup, and restore.

in-memory-database

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OJ Problems

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Banking System with Accounts, Transfers, Top Activity, and Merge Design and Implement Idempotent Library Notifications for Due Dates and Holds Fix Incorrect Metrics Caused by Applying Filters After Aggregation Implement Search and Filter UI for a Library Management Table Fix Backend Filtering for Book Search Results Idempotent Library Notifications for Due Loans and FIFO Holds Filter a Long Table with Two Dropdowns and a Text Search Box Find Minimal Shoppers Decode Password Design an In-Memory Database with Field-Level TTL, Prefix Scan, and Backup/Restore Count Subarrays With Alternating Parity (Odd/Even) Including Negatives Flip Inner Segment If String Starts and Ends With Vowels Compute counts on nested maps (Level 1/Level 2 aggregation)Bus Boarding Simulation (Priority + Wheelchair Capacity)Evaluate an Arithmetic Expression Decode an Encoded String In-Memory Database with Backup and Restore Worker Management System Decode Password from File Calculate Average Time Password Management Questions Banking System - Schedule and Cancel Payment 🦉 Collect Sticks Bubble Popping Game Balloon Color Pairs Instacart Marketplace Bidding System Architecture and Algorithm Design Instacart Search Ranking System Design and Scalability

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