The Card Interview Questions
The questions to prepare for The Card interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.
Explain how Java's checked and unchecked exceptions differ in compiler treatment, typical causes, and API design use.
Explain how to implement a singleton in Java, including thread safety, lazy initialization, and common pitfalls.
Evaluates your ability to reason about JVM memory behavior and diagnose leaks under load.
Tests your knowledge of Spring lifecycle phases and how they affect application behavior.
Tests your ability to reason about resource cleanup and reliability in exception paths.
Classify interview questions into Java, Spring Boot, or database topics and count each category.
AllstateAggregate completed orders and return customers whose totals exceed the average customer total.
CalixExplain core Java concepts and produce an aggregated SQL access summary using joins.
SaviyntTests your ability to build robust, consistent error handling in Spring services.
Tests your approach to consistent error modeling, status codes, and API response standards.
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