{"slug":"phonepe-interview-experience","title":"PhonePe SDE-1 Interview Experience and Questions","description":"PhonePe SDE-1 interview experience: review one backend technical round with two coding prompts and reported HTTP, database, microservices, and Kafka questions.","cluster":"Interview experiences","updated":"2026-10-31","url":"https://parlel.com/guides/phonepe-interview-experience","markdown":"This PhonePe account is specifically for an SDE-1 backend role. It describes one technical round rather than a complete multi-stage process, so the page stays close to what the candidate actually shared.\n\n## SDE-1 backend technical interview\n\nThe candidate reported two DSA questions: **Sort Colors**, using the Dutch National Flag approach ([source](https://leetcode.com/discuss/post/6437867/)), and checking whether an integer is a palindrome with O(1) extra space ([source](https://leetcode.com/discuss/post/6437867/)). The same round included these backend fundamentals:\n\n1. What are HTTP methods, and how do POST and PUT differ? ([source](https://leetcode.com/discuss/post/6437867/))\n2. What are the ACID properties of database transactions? ([source](https://leetcode.com/discuss/post/6437867/))\n3. How do microservices differ from a monolithic architecture? ([source](https://leetcode.com/discuss/post/6437867/))\n4. What is Kafka, how does it work, and where is it used? ([source](https://leetcode.com/discuss/post/6437867/))\n\nAll six prompts are named in the [PhonePe SDE-1 interview report on LeetCode Discuss](https://leetcode.com/discuss/post/6437867/) (2025). The source says the interview covered DSA, system design, and backend fundamentals, but it does not publish a separate system-design prompt or describe additional rounds.\n\n## How to prepare for the PhonePe SDE-1 backend interview\n\nThe two coding questions test different habits: maintain the Dutch National Flag invariant while partitioning, and avoid converting the whole number to a string if the interviewer expects constant extra space. For the backend questions, prepare concise examples from systems you have built. A useful answer about Kafka, for instance, should connect producers, topics, consumers, and the reason a team chose asynchronous messaging.\n\nThis is one candidate's experience, not a current PhonePe interview specification. See [system design interview questions](/guides/system-design-interview-questions) for broader backend practice and the [company experience hub](/guides/tech-company-interview-experiences) to compare other reports.\n\n## Frequently asked questions\n\n### Does this PhonePe report describe the complete SDE-1 hiring process?\n\nNo. It covers one technical round and does not describe earlier or later stages. Use it for the six reported prompts, not as a complete or current hiring sequence.\n\n## Looking for a referral at PhonePe?\n\nCreate a profile on Parlel to unlock hiring manager emails for roles you’re targeting.\n\n<a class=\"guide-cta-button\" href=\"/login\">Create a profile on Parlel</a>\n\n## About the author\n\nDheeraj Kumar, founder building Parlel, an open professional network for people, companies, and jobs. Find him on his [Parlel profile](/u/dheeraj).\n","html":"<p>This PhonePe account is specifically for an SDE-1 backend role. It describes one technical round rather than a complete multi-stage process, so the page stays close to what the candidate actually shared.</p>\n<h2>SDE-1 backend technical interview</h2>\n<p>The candidate reported two DSA questions: <strong>Sort Colors</strong>, using the Dutch National Flag approach (<a href=\"https://leetcode.com/discuss/post/6437867/\">source</a>), and checking whether an integer is a palindrome with O(1) extra space (<a href=\"https://leetcode.com/discuss/post/6437867/\">source</a>). The same round included these backend fundamentals:</p>\n<ol>\n<li>What are HTTP methods, and how do POST and PUT differ? (<a href=\"https://leetcode.com/discuss/post/6437867/\">source</a>)</li>\n<li>What are the ACID properties of database transactions? (<a href=\"https://leetcode.com/discuss/post/6437867/\">source</a>)</li>\n<li>How do microservices differ from a monolithic architecture? (<a href=\"https://leetcode.com/discuss/post/6437867/\">source</a>)</li>\n<li>What is Kafka, how does it work, and where is it used? (<a href=\"https://leetcode.com/discuss/post/6437867/\">source</a>)</li>\n</ol>\n<p>All six prompts are named in the <a href=\"https://leetcode.com/discuss/post/6437867/\">PhonePe SDE-1 interview report on LeetCode Discuss</a> (2025). The source says the interview covered DSA, system design, and backend fundamentals, but it does not publish a separate system-design prompt or describe additional rounds.</p>\n<h2>How to prepare for the PhonePe SDE-1 backend interview</h2>\n<p>The two coding questions test different habits: maintain the Dutch National Flag invariant while partitioning, and avoid converting the whole number to a string if the interviewer expects constant extra space. For the backend questions, prepare concise examples from systems you have built. A useful answer about Kafka, for instance, should connect producers, topics, consumers, and the reason a team chose asynchronous messaging.</p>\n<p>This is one candidate's experience, not a current PhonePe interview specification. See <a href=\"/guides/system-design-interview-questions\">system design interview questions</a> for broader backend practice and the <a href=\"/guides/tech-company-interview-experiences\">company experience hub</a> to compare other reports.</p>\n<h2>Frequently asked questions</h2>\n<h3>Does this PhonePe report describe the complete SDE-1 hiring process?</h3>\n<p>No. It covers one technical round and does not describe earlier or later stages. Use it for the six reported prompts, not as a complete or current hiring sequence.</p>\n<h2>Looking for a referral at PhonePe?</h2>\n<p>Create a profile on Parlel to unlock hiring manager emails for roles you’re targeting.</p>\n<p><a class=\"guide-cta-button\" href=\"/login\">Create a profile on Parlel</a></p>\n<h2>About the author</h2>\n<p>Dheeraj Kumar, founder building Parlel, an open professional network for people, companies, and jobs. Find him on his <a href=\"/u/dheeraj\">Parlel profile</a>.</p>","related":[{"slug":"tech-company-interview-experiences","title":"Tech Company Interview Experiences by Role and Level","description":"Compare software, platform, and AI company interview reports by role and level, with candidate-reported questions linked to their original sources.","url":"https://parlel.com/guides/tech-company-interview-experiences"},{"slug":"system-design-interview-questions","title":"System Design Interview Questions + 10 Walkthroughs","description":"System design interview questions with a clear framework, building blocks, capacity estimates, and 10 concise practice walkthroughs. Reviewed September 2026.","url":"https://parlel.com/guides/system-design-interview-questions"},{"slug":"interview-questions-and-answers","title":"Top Interview Questions and Answers (2026 Bank)","description":"Top interview questions and answers: 25+ proven responses with STAR method so you clear every round in 2026 — HR, technical, phone and video rounds covered.","url":"https://parlel.com/guides/interview-questions-and-answers"}]}