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Inc. Backend Engineer Interview Questions

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

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SQL vs NoSQL for High WritesMedium

Tests your ability to choose data stores based on write patterns, consistency, and operational needs.

nosqlsqldatabase design
Inc.
High-Concurrency API DesignHard

Tests system design skills for building low-latency, high-throughput APIs under concurrent load.

api designlow latencyconcurrency
Inc.
Real-Time Notification Architecture
Hard

Assesses your ability to design scalable real-time messaging and delivery mechanisms.

system designnotification systemarchitecture
Inc.
Cascading Failure Mitigation
Hard

Evaluates resilience patterns to prevent and contain cascading failures across services.

fault tolerancemicroservices
Inc.
Rate Limiting and Load Balancing
Medium

Assesses how you control traffic and distribute load to maintain stability and performance.

distributed systemsrate limitingload balancing
Inc.
URL Shortening at Scale
Hard

Tests end-to-end backend design for a high-scale, high-throughput URL shortening service.

system designscalability
Inc.
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Mentoring a Struggling Junior Engineer
Medium

Tests how you mentor junior teammates through structured feedback, communication, and ownership for both growth and team outcomes.

MentorshipCommunicationLeadership
Inc.
Disagreeing on Technical Debt Priorities
Medium

Tests conflict resolution and influence when balancing technical debt against product delivery with cross-functional stakeholders.

Conflict ResolutionStakeholder Managementtechnical debt
Inc.
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