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Updated weekly · Last refresh Aug 30

Pocket Fm Backend Engineer Interview Questions

The questions to prepare for a Pocket Fm Backend Engineer interview. Questions from real interview reports rank first. Updated weekly.

34questions
~7htotal time
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1
SQL & Data ManipulationStart here. 12 questions + 2 drills · ~162 min
Second Highest Trader SalaryEasy
Practice

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingPocket Fm
Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityPocket Fm
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Unify CRM and Google Analytics ViewHard
Practice
Practice drill

Merge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.

SubqueriesJoinsData WranglingArtefact
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2
Coding15 questions · ~177 min
Check String PermutationsEasy
Practice

Determine whether two Foursquare place-name strings contain exactly the same characters using frequency counting.

Hash TablesArraysStringsPocket Fm
Implement Merge SortEasy
Practice

Sort an array using merge sort and analyze its time and space complexity.

MathArraysSortingPocket Fm
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3
More topics7 questions · ~83 min
Session State in Distributed SystemsHard

Assesses strategies for reliable session management across multiple backend instances.

distributed systemsManagementPocket Fm
What Happens When You Click a URLMedium

Evaluates understanding of end-to-end web request flow from browser to backend services.

NetworkingPocket Fm
Distributed Data Consistency StrategiesHard

Tests your understanding of distributed consistency techniques and how to apply them to real systems.

strategiesdistributed systemsdata consistencyPocket Fm
Overloading vs OverridingMedium

Assesses OOP method behavior distinctions and when each applies.

CodingoopPocket Fm
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The finish line: interview-readyComplete all 34 questions plus 2 hands-on drills to finish this plan.