Instacart Software Engineer Coding & Algorithms Interview Questions
Practice 31 real Coding & Algorithms interview questions for Software Engineer roles at Instacart.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
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"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Find Largest Adjacent Stock Price Change
This question evaluates algorithmic problem-solving and data-manipulation skills, specifically date-based sorting, computing signed versus absolute ad...
Implement bus route simulation features
Bus Route Simulation – Boarding, Capacity, and Priority Passes You are given a partially implemented codebase for simulating bus routes in a city. Bus...
Decode an encoded string
Implement a decoder for an encoded string where repetition is expressed with a number followed by a bracketed substring. Rules: - A pattern k[substrin...
Implement prefix and suffix file search
Implement data structures and APIs to store file names and support efficient queries that match both a given prefix and suffix. Provide methods add(na...
Implement an In-Memory File Storage System
Implement an in-memory file storage service. You need to support files identified by a unique full path string, such as "/docs/a.txt". Each file has a...
Pivot order-status counts
Pivot order-status counts Given an orders table (order_id, shopper_id, order_date, status, …), pivot the data so that each row is one shopper and each...
Implement worker time and payroll tracker
This question evaluates skills in designing in-memory data structures and algorithms for temporal event handling, interval arithmetic, stateful toggle...
Implement store, evaluator, and parser
This question evaluates implementation skills in data structures and algorithms, covering time-based versioning and TTL in an in-memory key-value stor...
Evaluate query ratios from equations
This question evaluates a candidate's skill in modeling variable ratios as relational structures, reasoning about transitive numeric relationships, an...
Solve bank, password, expression algorithm tasks
Solve bank, password, expression algorithm tasks Implement a banking system that supports four specified operations within 90 minutes. Implement a pas...
Compute delivery wait times
You're building a last‑mile delivery simulator. Given n orders, each with arrival_time (non-decreasing integers) and service_time (positive integers),...
Solve expression evaluator and string decoder
1) Implement an arithmetic expression evaluator that reads expressions from a text file (one expression per line) and outputs the evaluated result for...
Optimize file reading and expression DFS
Optimize file reading and expression DFS Given a large password file, build a program to read the required password(s) while minimizing memory usage. ...
Compute immediate delivery percentage
Compute immediate delivery percentage LeetCode 1173. Immediate Food Delivery I – Write an SQL query to calculate the percentage of immediate (same-day...
Design a versioned key-value store
Design a versioned key-value store Design and implement a versioned key-value store that supports set(key, value, timestamp) and get(key, timestamp) t...
Evaluate arithmetic expression with precedence
Question Implement an evaluator for a string arithmetic expression. The input contains non-negative integers, the operators +, -, `, /, parentheses ( ...
Evaluate arithmetic expression using DFS
Given a string representing an arithmetic expression with non-negative integers, +, -, *, /, parentheses, and optional spaces, evaluate its value. Use...
Optimize file reads for password validation
Given a multi-gigabyte credentials file on disk with one record per line in the format user_id,salt,password_hash (hex), implement validate(user_id, p...
Parse password from indexed matrix file
Question Given a filepath to a text file containing one index line [x, y] followed by a matrix of characters (origin at lower-left (0, 0)), return the...
Build a Progressive Banking System
Build a Progressive Banking System The source reports progressive account, activity-ranking, expiring-transfer, and merge features but not exact retur...