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Backend Engineer Interview Questions
Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.
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Showing 1–2 of 2 results
- InstacartMediumBackend EngineerDebug Metrics Computed Before Filtering
Debug a metrics endpoint whose summary is calculated before user filters are applied even though its rows are filtered correctly. Trace the data lineage, aggregate over the full matched population before pagination, preserve security scoping, and add unit and endpoint regression tests.
Software Engineering FundamentalsOnline Assessment - TargetMediumBackend EngineerImplement a Synchronized First-Available Seat Allocator
This problem tests your ability to design a thread-safe allocator that manages a finite resource pool under high concurrency, focusing on atomic updates and race condition prevention.
Software Engineering FundamentalsOnline AssessmentConcurrencyAtomic OperationsThread Safety
Instacart