Three candidates describe Costco software engineering interviews that differ widely: a short culture-focused conversation, a panel loop with an anagram and testing-framework design, and a six-round process with SQL, Java code review and algorithms.
$124K
Avg. Base Comp
$164K
Avg. Total Comp
Not reported
Typical Rounds
Not reported
Process Length
Costco software engineer interviews vary a lot by candidate. One person describes a single hour with a hiring manager and tech lead that was mostly behavioral and personal, and said the interviewers barely touched their full stack background. A second describes an assessment, a 30-minute virtual screen, then a 90-minute in-person panel and a 60-minute virtual panel. That candidate saw a string anagram check, a request to design a testing framework, and a snippet to debug. A third reports six rounds: a take-home assessment, then four technical rounds of about an hour each with leads, managers, QA staff and architects.
The third candidate's technical content is the most specific. It included SQL joins with stored procedures on hotel and city tables, and a buggy Java class to review, with off-by-one errors, == versus .equals() and missing null checks. Algorithm problems included finding the next cheaper flight price for each day, a product API retrieval task and 3-sum. That candidate also says interviewers asked unrelated questions during coding, so practice talking through a solution while being interrupted.
None of the three reports ended in a hire, and two mention weak communication or feedback from the company. The candidate with the panel loop waited about two months for a recruiter and got no reply after the interviews. Ask early who you will meet and what each session covers, and keep your own notes on the schedule. Prepare core data structures and algorithms, SQL, debugging, and a clear behavioral story about your projects. Be ready to bring your relevant experience into the conversation yourself rather than waiting to be asked.
Synthesized from 3 candidate reports by our editorial team.
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Real interview reports from people who went through the Costco Wholesale process.
I applied online and waited about two months before a recruiter reached out via email. There was no initial phone screen—they just went straight to scheduling me with various team members and leaders. The process felt disorganized from the start. When I asked who I'd be meeting with in each round, the recruiter told me it would be the hiring manager, but then scheduled me with other people instead. No one gave me clear information about what to expect or what the timeline looked like, and after I finished the interviews, follow-ups went unanswered.
The interview structure itself included an initial assessment test, followed by a 30-minute virtual phone screen. Then came a 90-minute in-person panel interview and a 60-minute virtual panel interview. The questions ranged pretty widely. Some were behavioral, though one risk manager leaned more technical and tried to push harder than others. I also got a classic algorithmic question about checking if two strings are anagrams, and was asked to design a testing framework. In another session, they gave me a code snippet and asked me to identify bugs and suggest fixes. The technical difficulty varied—some felt reasonable, others felt like they were testing edge cases pretty aggressively.
What struck me most was how messy the communication was throughout. The recruiter didn't set clear expectations, didn't prep me on who I'd actually meet with, and then went silent after the rounds ended. I followed up a couple of times but never heard back about next steps. It felt like the whole thing lacked structure and coordination, which was disappointing given how much Costco emphasizes their external brand values. Overall, it was a frustrating experience with some real red flags.
Prep tip from this candidate
Be ready for both algorithmic problems like anagram checking and system design questions like testing frameworks—the technical bar varies by interviewer. More importantly, ask the recruiter upfront for a detailed interview plan with names and titles of each interviewer, and confirm it in writing; the lack of clarity here was a recurring pain point.
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Sourced from candidate reports and verified by our team.
Topics based on recent interview experiences.
Featured question at Costco Wholesale
Total Spent on Products
| Question | |
|---|---|
| Cumulative Sales Since Last Restocking | |
| Total Transactions | |
| 2nd Highest Salary | |
| Customer Orders | |
| Monthly Customer Report | |
| Random SQL Sample | |
| Top 3 Users | |
| Over-Budget Projects | |
| Retailer Data Warehouse | |
| Max Quantity | |
| Hurdles In Data Projects | |
| Friend Requests Down | |
| Average Order Value | |
| Monthly Product Sales | |
| Normalize Grades | |
| Valid Anagram | |
| Client Solution Pushback | |
| Black Friday Shopping Spree | |
| Common Prefix | |
| ATM Robbery | |
| Seller Type Modeling | |
| String Palindromes | |
| Sales Leaderboard | |
| Find Mismatched Words | |
| Testing Constraints | |
| Your Strengths and Weaknesses | |
| Azure Kubernetes Infrastructure | |
| Why Do You Want to Work With Us | |
| Weighted Average Sales |
Synthesized from candidate reports. Individual experiences may vary.
One candidate says they applied online and heard from a recruiter by email after about two months, with no initial phone screen. Another describes a friendly HR call that led to a take-home assessment. Candidates may want to ask for a written interview plan with names and titles.
Two candidates report an assessment early on. One calls the take-home coding assessment straightforward and says they completed it on their own time. The other mentions an initial assessment test before a 30-minute virtual phone screen. Details of its content were not given.
Candidates report varied technical content: checking whether two strings are anagrams, designing a testing framework, and finding bugs in a snippet. One candidate also reports SQL joins with stored procedures, a Java code review, next cheaper price, a product API task and 3-sum. Interviewers may ask unrelated questions mid-problem.
One candidate reports a 90-minute in-person panel and a 60-minute virtual panel, with some behavioral questions and one more technical interviewer. Another reports a single hour with a hiring manager and tech lead, covering behavioral and personal questions rather than their full stack work.
None of the three candidates ended up joining. One says follow-ups went unanswered after the interviews, and another says they were told Costco wanted more experience. Candidates may want to keep their own record of the schedule and follow up in writing.
