What interview questions does Square ask?

Candidates have reported 16 questions from Square interviews to TrueInterview: 8 algorithm, 3 system design, 3 object-oriented programming and 2 study. Each one is filed under the round it came up in, with the month it was reported where a candidate gave one, and opens in the workspace that format calls for — an editor judged against hidden tests for coding and SQL, a whiteboard for system design.

How recent are these Square interview questions?

The most recent Square question on this page was reported in October 2026. A question shows the month a candidate reported it whenever that is known, so an entry that has gone stale is visible as one rather than presented as current.

Which Square interview rounds do these questions come from?

The reported Square questions on this page are filed under 2 rounds: Phone Screen and Onsite. Filtering by a round gives you the questions candidates were asked at that stage rather than the whole bank at once.

How hard are Square's interview questions?

Of the 14 rated Square questions on this page, the spread is 3 easy, 7 medium and 4 hard. Difficulty is the rating on the question itself, not a prediction of how a particular loop will go.

Where do these Square interview questions come from?

From candidates who sat the interview. Some send us their questions by email or upload; the rest we summarize from interview experiences, on the public board or published elsewhere, then verify and file by company, format and round. Nothing covered by an NDA is accepted, and the sourcing rules are published in full at /methodology.

Do I need an account to practise Square questions?

Browsing this page needs no account, and 4 of the 16 Square questions listed here open in full for free. The rest are part of a paid plan, and every row says which it is before you click it.

Square Interview Questions: 16 Real Questions

About Square

Square is Block's seller business: card readers, point-of-sale software, payroll, lending and commerce tools for small and mid-sized merchants. Founded in 2009 by Jack Dorsey and Jim McKelvey, it became a division of Block when the parent company renamed itself in 2021.

Industry: Merchant payments & commerce
Founded: 2009
Size: Part of Block (5,000+ employees)
HQ: Oakland, CA
Website: squareup.com

Company research

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Square is Block's seller business: card readers, point-of-sale software, payroll, lending and commerce tools for small and mid-sized merchants. Founded in 2009 by Jack Dorsey and Jim McKelvey, it became a division of Block when the parent company renamed itself in 2021.

Merchant payments & commerce
Oakland, CA
Founded 2009

Covered in the research, each with its source

Technology and AI
Recent moves
Likely challenges

Read the Square research

Square hiring insights

Computed from candidates’ write-ups and our Square questions.

What they ask

Topic mix

Hashing25%(2)
Sorting25%(2)
Graphs13%(1)
Matrix13%(1)
Other (2 topics)25%(2)

Across the 8 of 16 Square questions tagged with a topic.

Difficulty mix

Easy21%(3)
Medium50%(7)
Hard29%(4)

Across the 14 of 16 questions with a difficulty rating.

Practice this mix

Open roles at Square46

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Interview questions16

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Algorithm8 System Design3 OOP3 Study2 Phone Screen6 Onsite11 Easy3 Medium7 Hard4

View all 16 Square questions

Frequently asked: Square interviews

What interview questions does Square ask?: Candidates have reported 16 questions from Square interviews to TrueInterview: 8 algorithm, 3 system design, 3 object-oriented programming and 2 study. Each one is filed under the round it came up in, with the month it was reported where a candidate gave one, and opens in the workspace that format calls for — an editor judged against hidden tests for coding and SQL, a whiteboard for system design.
How recent are these Square interview questions?: The most recent Square question on this page was reported in October 2026. A question shows the month a candidate reported it whenever that is known, so an entry that has gone stale is visible as one rather than presented as current.
Which Square interview rounds do these questions come from?: The reported Square questions on this page are filed under 2 rounds: Phone Screen and Onsite. Filtering by a round gives you the questions candidates were asked at that stage rather than the whole bank at once.
How hard are Square's interview questions?: Of the 14 rated Square questions on this page, the spread is 3 easy, 7 medium and 4 hard. Difficulty is the rating on the question itself, not a prediction of how a particular loop will go.
Where do these Square interview questions come from?: From candidates who sat the interview. Some send us their questions by email or upload; the rest we summarize from interview experiences, on the public board or published elsewhere, then verify and file by company, format and round. Nothing covered by an NDA is accepted, and the sourcing rules are published in full at /methodology.
Do I need an account to practise Square questions?: Browsing this page needs no account, and 4 of the 16 Square questions listed here open in full for free. The rest are part of a paid plan, and every row says which it is before you click it.

How these questions are sourced and verified