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FlexTrade Systems Inc. Software Engineer Interview Questions

The questions to prepare for a FlexTrade Systems Inc. Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~8htotal time
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1
CodingStart here. 31 questions · ~281 min
Delete Number From ArrayEasy
Practice

Compact a static array in place by removing every occurrence of a target value while preserving element order.

ArraysFFlexTrade Systems Inc.
Design an LRU CacheEasy
Practice

Implement an LRU cache in O(1) average time using a hash table and doubly linked list.

Hash TablesQueueLinked ListsFFlexTrade Systems Inc.
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2
SQL & Data Manipulation3 questions + 3 drills · ~57 min
Database Tuning and Shell ScriptingHard

Assesses practical skills for performance troubleshooting and automation.

shell scriptingFFlexTrade Systems Inc.
SQL With Joins and SubqueriesMedium

Evaluates your SQL proficiency with joins, subqueries, and query composition.

JoinssqlFFlexTrade Systems Inc.
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
Sum From 1 to 1,000,000Easy
Practice
Practice drill

Calculate the sum of integers from 1 to 1,000,000 using PostgreSQL aggregation and filtering.

AlgorithmsVirtu Financial
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
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3
System Design5 questions · ~45 min
Architecture of Recent SystemMedium

Assesses your ability to explain system structure, components, and design decisions.

experiencearchitectureFFlexTrade Systems Inc.
Monitor and Debug Distributed SystemsHard

Evaluates operational thinking, observability practices, and debugging strategy.

monitoringDebuggingFFlexTrade Systems Inc.
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4
Security & Infrastructure3 questions · ~27 min
Java Garbage Collector and AngularMedium

Assesses your understanding of runtime memory management and its practical impact.

javaFFlexTrade Systems Inc.
Security: Telnet and File ListingMedium

Evaluates security reasoning and safe testing practices for common infrastructure exposures.

NetworkingFFlexTrade Systems Inc.
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5
Behavioral & Leadership8 questions · ~72 min
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.