Coding questions
Persistent Systems Online Assessment
Overview
Here is how public prep guides and student write-ups describe the Persistent Systems online assessment. This is not an official company brochure.
Martian internship-to-PPO pathway with staged training assessments is a distinctive campus pattern reported for Persistent.
Usual selection rounds
Rounds students usually mention: Online assessment (aptitude + CS fundamentals + coding) → Technical interviews → Communication / SVAR (Amcat reported in Martian path) → HR
| Item | From student reports |
|---|---|
| Platform | AMCAT / Cocubes mentioned in secondary guides; Martian GFG account describes aptitude+logical+CS fundamentals MCQs plus 2 coding questions |
| Online test summary | Product-engineering flavoured filter: aptitude/verbal/logic plus a coding section that candidates say carries more weight than at mass-service firms. Some drives club everything; others separate coding. |
| Eligibility notes | Drive-specific; confirm notification |
| Branches (reported) | Typically CS/IT and related for software tracks |
Online test sections
| Section | Questions | Time | Notes |
|---|---|---|---|
| Aptitude / logical / verbal | ~15-20 each (from student reports estimates) | drive-specific | PapersAdda aggregates AmbitionBox/Shiksha style estimates - check your college placement email |
| Coding | 1-2 (sometimes 2 in Martian assessment) | - | Easy-medium; language track matters in Martian training assessments (Java or Python) |
Extra notes from sources
- Martian Program: weekly training assessments then final MCQ+2 coding for PPO shortlist.
Sample practice question styles
These are practice questions for speed - not claimed to be from a real Persistent Systems live paper.
Coding Q1: Binary search
Problem: Given a sorted array of distinct integers and a target, return the index of target or -1 if missing.
Approach: Maintain lo/hi. Compare mid with target and shrink the half that cannot contain it. Careful with overflow-free mid and empty arrays.
Complexity: O(log n) time
Persistent Systems tip: Restate the problem, sketch a brute-force idea, then tighten it. Call out edge cases (empty input, single element, overflow) before you write code.
Coding Q2: Move zeros
Problem: Move all zeros in an array to the end while keeping the relative order of non-zero elements.
Approach: Two pointers: write non-zeros toward the front, then fill the remainder with zeros. Or swap zeros as you scan.
Complexity: O(n) time, O(1) space
Persistent Systems tip: Restate the problem, sketch a brute-force idea, then tighten it. Call out edge cases (empty input, single element, overflow) before you write code.
Coding Q3: Rotate array
Problem: Rotate an array to the right by k steps. Example: [1,2,3,4,5,6,7], k = 3 → [5,6,7,1,2,3,4].
Approach: Normalize k %= n. Reverse the whole array, reverse the first k elements, then reverse the rest. That yields the rotation in place.
Complexity: O(n) time, O(1) space
Persistent Systems tip: Restate the problem, sketch a brute-force idea, then tighten it. Call out edge cases (empty input, single element, overflow) before you write code.
Coding Q4: First unique character
Problem: Find the first non-repeating character in a string and return its index, or -1 if none exists.
Approach: Count frequencies in one pass (hash map or array of 26 for lowercase). Second pass returns the first index with count 1.
Complexity: O(n) time
Persistent Systems tip: Restate the problem, sketch a brute-force idea, then tighten it. Call out edge cases (empty input, single element, overflow) before you write code.
Prep tips from those student reports
- Prioritise coding correctness for the product-engineering filter
- Be ready to defend projects and CS fundamentals in tech rounds
- Practice a timed communication/SVAR style speaking test if on Martian/Amcat path
Sources
- Persistent Systems Placement Process 2026 - PapersAdda (other)
- Persistent Systems Interview Experience (Martian Program) 2024 - GFG (gfg)
These notes come from public reports and can differ by campus, year, and role. If your college placement email or the official careers/notification PDF says something different, follow that.
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