For additional preparation, see our guide on Square, Cash App, and Block Interview Guide.
For additional preparation, see our guide on Square/Block Engineering Interview Guide.
The behavioral round is where many candidates fall short — prepare with our behavioral interview guide.
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"headline": "Square / Block Software Engineer Interview Guide 2026: Process and Preparation",
"description": "Square (now Block, the parent company of Square, Cash App, TIDAL, and TBD) builds payment infrastructure used by millions of merchants and consumers.",
"datePublished": "2026-03-23",
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"text": "Square interviews typically run 5–6 rounds: a recruiter screen (30 min), a technical phone screen (45–60 min), then 4–5 onsite or virtual rounds covering coding algorithms, system design, behavioral questions (STAR method), and for senior roles a leadership/culture-fit round. The full process takes 4–6 weeks from initial contact to offer."
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{
"@type": "Question",
"name": "What programming language should I use for Square interviews?",
"acceptedAnswer": {
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"text": "Square allows candidates to choose their preferred language. Most candidates use Python for its concise syntax, but Java, C++, and Go are equally accepted. Focus on clear, readable code rather than language tricks — interviewers evaluate your problem-solving approach, not language familiarity."
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"text": "Square coding interviews are considered high difficulty. Expect medium-to-hard LeetCode-style problems with a focus on algorithms, system design, and behavioral questions. Practice 100–200 problems on LeetCode with a focus on company-tagged problems before your interview loop."
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