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Top 50 Software Engineer Interview Questions

The 50 most important questions to prepare for Software Engineer interviews. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 25 questions · ~563 min
Linked List ReversalEasy
Practice
Recently asked

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysA S S E M B L E DCrescent Electric SupplyCenterWell
Reverse a String in PythonEasy
Practice
Recently asked

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonCNAAct DigitalLos Alamos National Laboratory
Two Sum with TargetEasy
Practice
Recently asked

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsiCapitalPaycomBlend360
Implement Binary SearchEasy
Practice
Recently asked

Implement binary search to find a target value in a sorted array in O(log n) time.

Recursionbinary searchArraysHHAeXchangeEDF RenewablesSRS Consulting
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2
SQL & Data Manipulation25 questions · ~563 min
Second Highest Trader SalaryEasy
Practice
Recently asked

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

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Second Highest Without AggregatesHard
Practice
Recently asked

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
Optimize a Slow SQL QueryHard
Practice
Recently asked

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingAmeripriseEEltro Cyberchrome PrivateEnergyHub
SQL Query PracticeEasy
Practice
Recently asked

Return the second-highest distinct non-null salary from a single employee table.

null handlingsqldatabase queryingii3 ConsultingTTravelexIInfrrd
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