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New Interview Questions: September 2026

Questions added to the Dataford question bank in September 2026, ranked by how often they are asked in real interviews.

100questions
~20htotal time
42companies covered
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1
SQL & Data ManipulationStart here. 14 questions · ~169 min
Employees Missing Building NumberEasy
Practice

Use a LEFT JOIN to find employees in the company who do not have a building number.

JoinsAmazonAmazon Web Services
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2
Coding14 questions · ~169 min
LCA with Parent PointersMedium
Practice
Recently asked

Find the lowest common ancestor of two tree nodes using parent pointers in O(depth) time and O(1) extra space.

Data StructuresAlgorithmsMeta PlatformsMeta
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3
Execution14 questions · ~169 min
End-to-End Project Life CycleMedium
Recently asked

Explain how you initiate, plan, execute, monitor, launch, and close a cross-functional project.

Executiondelivery managementcross-functional executionQinetiqCCapcoWebmd
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4
System Design14 questions · ~169 min
Own Endpoints and EntitlementsHard
Recently asked

Design how an AI assistant exposes tools, enforces entitlements, and separates agents, orchestrator, and MCP server responsibilities.

authorizationapi gatewayagent designJPMorganChase
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5
Metrics12 questions · ~145 min
Time-Series Pattern AnalysisMedium

Interpret a time-series dataset, identify key trends, and explain how you would diagnose the drivers behind them.

KPIsdiagnostic processactionable insightsGoogle
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6
Security & Infrastructure13 questions · ~157 min
Mitigating AI-Specific ThreatsHard

Design layered controls for prompt injection, sensitive-data exposure, unsafe tool use, and manipulated AI outputs.

application securityrisk mitigationaccess managementClickUpAdobe
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7
More topics19 questions · ~229 min
Evaluating a ChatGPT Trial ExperimentMedium

Analyze whether a free ChatGPT trial increases conversion, and decide if the lift is statistically and commercially meaningful.

MDEGuardrail Metricsprimary metricsOpenAI
Metric for New Online CourseMedium

Define the right metric for evaluating a new online Communication course.

Google
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