BILL Software Engineer Interview Questions

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

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CodingStart here. 23 questions · ~195 min

Remove consecutive anagrams from a word list while preserving the first word in each anagram group.

Explain Solution Time ComplexityEasy

Explain how to analyze an algorithm’s time and space complexity and justify the result from the code structure.

Hash TablesSearchingSorting

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Optimizing Search and RetrievalMedium

Tests your approach to performance, indexing, and query optimization.

optimizationsearch

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System Design6 questions · ~51 min

Tests your architectural judgment around complexity, scaling, and operational overhead.

Notification System at ScaleHard

Tests your ability to design scalable messaging, delivery, and reliability.

system designscalability

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High Availability Payment ServiceHard

Tests system design for reliability, failover, and uptime in payment processing.

system designhigh availability

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Behavioral & Leadership20 questions · ~169 min

Adapting to Late Direction ChangesMedium

Tests adaptability under pressure, stakeholder management, and prioritization when senior feedback changes direction late.

leadership feedbackadaptabilityDealing With Ambiguity

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