Aircall Backend Engineer Interview Questions

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

Evaluates system design skills for high-throughput event ingestion and delivery.

Synchronous vs Asynchronous Trade-offs

Medium

Evaluates your ability to reason about latency, reliability, and coupling in distributed systems.

Trade-offs

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Consistency Across Microservices

Hard

Tests your strategies for consistency, transactions, and failure handling in microservices architectures.

system architecturedata consistencymicroservices

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Assesses engineering practices for reliability and long-term maintainability with typing.

Async Programming in Python

Medium

Tests your understanding of async patterns, concurrency, and performance in Python services.

performancepython

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Refactor Legacy for Performance

Hard

Assesses refactoring skills focused on performance improvements and testability.

performanceTesting

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Balancing Debt Against Feature Delivery

Medium

Tests prioritization and ownership when balancing technical debt with feature delivery under stakeholder pressure.

technical debtfeature deliveryProject Management

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PostgreSQL Indexing Trade-offs

Medium

Evaluates your ability to choose indexes that balance write cost, query speed, and storage.

postgresqlperformance

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