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Charles Schwab Software Engineer Interview Questions

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

50questions
~9htotal time
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1
CodingStart here. 28 questions · ~301 min
Reverse Array of StringsEasy
Practice

Reverse an array of strings in place using two pointers with O(n) time and O(1) extra space.

ArraysStringsArray ManipulationCharles Schwab
Variables and Data Structure Trade-OffsMedium
Practice

Classify common variable types and choose an array-based or linked list using the required operation profile.

ArraysabstractionData StructuresCharles Schwab
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2
Execution3 questions · ~32 min
Scale From 700 to 1,000,000 UsersHard

Create an execution plan to scale a product from 700 users to 1,000,000 while managing capacity, reliability, cost, and rollout risk.

scalingcloud scalingfault toleranceCharles Schwab
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3
Technical Fundamentals6 questions · ~64 min
Stack vs QueueEasy

Tests the difference between Stack and Queue, especially access order and common use cases.

Language FeaturesJVM InternalsData StructuresCharles Schwab
Interface vs Abstract ClassMedium

Tests when to use an interface versus an abstract class, and what inheritance and implementation rules differ.

javaLanguage FeaturesabstractionCharles Schwab
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4
Behavioral & Leadership10 questions · ~107 min
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5
More topics3 questions · ~32 min
OOP FundamentalsMedium

Evaluates your knowledge of core object-oriented programming concepts.

Charles Schwab
Banking Architecture in OOHard

Evaluates your system modeling skills and ability to translate a domain into OO design.

bankingarchitectureCharles Schwab
SQL Parent-Child DeletesMedium

Evaluates your understanding of referential integrity and safe delete ordering.

stored proceduresdatabaseCharles Schwab

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Practice drill

Calculate the monthly spending trends for customers using window functions and joins.

The Home DepotAvisoHewlett Packard Enterprise
Second-Highest Client Transaction AmountMedium
Practice
Practice drill

Use a CTE, join, and dense ranking to return each client's second-highest distinct transaction amount.

Window FunctionsSubqueriesRankingThe AmeripriseTata Consultancy Services (North America)Wells Fargo
Rolling 7-Day Average with Window FunctionsMedium
Practice
Practice drill

Calculate patient rolling 7-day averages and rank patients within each Medpace research site using layered window functions.

Window FunctionsRankingRunning TotalsMedpaceCharles SchwabHealth Care Solutions At Home
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.