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."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"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."
Decode a password string into letters
This question evaluates string parsing and encoding/decoding skills, specifically mapping numeric tokens and handling delimiter characters within the ...
Implement multiple coding round problems
This multi-part question evaluates algorithmic problem-solving skills including efficient lookup/search, stable ordering and priority management, stre...
Implement timestamped task management system APIs
You are implementing an in-memory Task Management System. All API methods are called with a timestamp representing the logical time when the operation...
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),...
Parse a password from a matrix
Given an m x n matrix of characters, a starting coordinate (row, col), and a string of moves consisting of 'U', 'D', 'L', 'R', parse a password by vis...
Validate password strength and repair
Given a password policy—length between 8 and 20 characters; must include at least one lowercase letter, one uppercase letter, and one digit; and must ...
Implement a banking operations system
Implement a simple banking system that manages multiple accounts with initial balances. Support operations: deposit(accountId, amount), withdraw(accou...
Compute and optimize average wait time
You are given n pickup orders for a grocery delivery counter. Each order i is described by orders[i] = [arrival_i, service_i] in minutes, where arriva...
Implement matrix-indexing and expression resolver
Question Given a text file path whose contents include a single block starting with a line like "[2,4]" followed by rows of equal-length characters (e...
Evaluate dependent variable expressions
Question Given a target variable name and a list of assignment strings of the form 'Ti = expression' where the expression is either a number, a single...
Compute average customer waiting time
Compute average customer waiting time You are given n customer orders; each order i = [a_i, p_i] where a_i is the arrival time and p_i is the preparat...