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Prep plan
Updated weekly · Last refresh Oct 17
3

3Pillar Software Engineer Interview Questions

The questions to prepare for a 3Pillar Software Engineer interview. Questions from real interview reports rank first. Updated daily.

36questions
~6htotal time
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1
CodingStart here. 18 questions · ~187 min
Palindrome Check in Any LanguageEasy
Practice

Check whether a string is a case-insensitive palindrome while ignoring non-alphanumeric characters using two pointers.

string manipulation33Pillar
Design Patterns in OOPMedium

Explain design patterns and discuss when to use Singleton or Factory to solve object-oriented design problems.

abstractionfunctionsoop33Pillar
Choosing Data Structures for ProblemsMedium

Explain how to choose the right data structure based on access patterns, constraints, and complexity tradeoffs.

Hash TablesTreesGraphs33Pillar
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2
Behavioral & Leadership13 questions · ~135 min
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3
More topics5 questions · ~52 min
SQL Aggregation Over Positives and NegativesEasy
Practice

Use CASE, a CTE, and a LEFT JOIN to sum positive and negative project values separately.

aggregationsql queries33Pillar
Handling Memory-Intensive OperationsMedium

Assesses your approach to performance, memory constraints, and safe optimizations.

memory managementperformance33Pillar
Component Data FlowMedium

Tests your understanding of component communication and state/data flow patterns.

reactnode.jsaws33Pillar
5 GB File Sorting With 1 GB RAMHard

Assesses your ability to design memory-efficient algorithms and pipelines.

memory managementSorting33Pillar
SQL Queries and Multi-threadingMedium

Evaluates your ability to connect data querying with concurrent programming concepts.

multithreadingsql queries33Pillar

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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Unique Elements and Top-K FrequenciesMedium
Practice
Practice drill

Return the first row for each unique value, then rank the k most frequent values.

large datasetsData Structurescomplex queriesEverlaw
SQL Ordering and JoinsMedium
Practice
Practice drill

Use ordered record selection and joins to return each instrument's latest qualifying order and event with fill details.

coding challengeJoinscomplex queriesPoint72
The finish line: interview-readyComplete all 36 questions plus 2 hands-on drills to finish this plan.