Dataford
Dataford
Top 21
Prep plan
Updated weekly · Last refresh Oct 7

Aircall Backend Engineer Interview Questions

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

21questions
~3htotal time
Track your progressSign up free to work through all 21 questions and resume where you left off.
Start practicing free →
1
CodingStart here. 4 questions · ~36 min
Function and Test SuiteMedium
Practice

Find the minimum Aircall agent capacity needed for overlapping calls using sorting and a min-heap.

function implementationTestingAircall
Async Programming in PythonMedium

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

performancepythonAircall
Type Safety in FastAPI or DjangoMedium

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

maintainabilityAircall
More Coding questions with a free account
2
System Design11 questions · ~100 min
Scalable Notification SystemHard

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

notification systemAircall
Memory Layer for AI ContextHard

Evaluates system design for context retention, retrieval, and consistency across interactions.

Aircall
Synchronous vs Asynchronous Trade-offsMedium

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

Trade-offsAircall
More System Design questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Behavioral & Leadership5 questions · ~45 min
Leading a Vague Production InvestigationMedium

Tests ownership under ambiguity, influence during a technical investigation, and clear communication before root cause is known.

memory leakmacos appDebuggingAircall
More Behavioral & Leadership questions with a free account
4
More topics1 question · ~9 min
PostgreSQL Indexing Trade-offsMedium

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

postgresqlperformanceAircall
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Time-to-Conversion SQL by ChannelMedium
Practice
Practice drill

Task Aircall's marketing team wants to compare how quickly leads from LinkedIn and Google Ads convert. Assume the query runs on 2026-08-29, and define the...

Date FunctionsJoinsAggregationsAircall
Top 3 Longest Calls Per AccountMedium
Practice
Practice drill

Return each account's three longest September 2026 calls using joins, date filtering, and per-account ranking.

Window FunctionsDate FunctionsJoinsAircall
SQL for Power UsersMedium
Practice
Practice drill

Aggregate Aircall calls and distinct integrations to identify users meeting both power-user thresholds.

JoinsData AnalysisGroup ByAircall
The finish line: interview-readyComplete all 21 questions plus 3 hands-on drills to finish this plan.