League Software Engineer Interview Questions

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

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CodingStart here. 15 questions · ~134 min

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

Linked List ReversalEasy

Practice

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

RecursionLinked ListsArrays

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Execution14 questions · ~125 min

Explain how you would optimize a system for performance, reliability, and user experience while making clear trade-offs and defining success.

Scalable and Maintainable Solution ExecutionEasy

Explain how you plan for scalability and maintainability up front, including trade-offs, success criteria, and risk management.

InfrastructureTrade-offsRisk Assessment

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System Design6 questions · ~54 min

High Availability OCR SystemHard

Evaluates system design skills for availability, scalability, and reliability.

high availability

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Upload System with Diagrams and MocksHard

Evaluates end-to-end design skill across UI, domain modeling, and system architecture.

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Behavioral & Leadership13 questions · ~116 min

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