Coding questions
Persistent Systems Online Assessment
Overview
The Persistent Systems online assessment (OA) is the first round of fresher hiring, and clearing it shortlists you for interviews, not an offer. Format (candidate-reported): Aptitude + CS MCQs + 1-2 coding. Full process: OA → Tech (1-2) → HR; Martian adds training + SVAR. Eligibility: ~60% or 6.0-6.5 CGPA; 10th/12th often 60%; no active backlogs.
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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