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Deepgram Interview Questions

The questions to prepare for Deepgram interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 4 questions · ~39 min
Thread-Safe LRU Cache with TTLHard
Practice

Implement an O(1) average-time LRU cache with per-entry expiration using a hash map, doubly linked list, and thread-safe access.

Hash TablesLinked ListsHeapDeepgram
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2
Execution3 questions · ~30 min
Prioritize Across Competing Data ProjectsEasy

Explain how you prioritize across multiple concurrent data engineering projects with competing stakeholder needs and limited capacity.

Trade-offsRoadmappingScope ManagementDeepgram
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3
System Design3 questions · ~30 min
Build a Simple Audio API ServerMedium

Design and implement an API for uploading, listing, downloading, and summarizing user audio files.

backend integrationdata ingestionml inferenceDeepgram
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4
Machine Learning3 questions · ~30 min
ASR and ML FundamentalsHard

Explain core ASR architectures, decoding, evaluation metrics, and practical machine learning tradeoffs.

model selectionDeep LearningModel EvaluationDeepgram
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5
Metrics3 questions · ~30 min
Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement MetricsDeepgram
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6
Statistics & Probability3 questions · ~30 min
Determining A/B Test SignificanceMedium

Explain how to evaluate whether an A/B test result is statistically significant and how to interpret the result.

marketing experimentStatistical SignificanceAnalysisDeepgram
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7
More topics31 questions · ~305 min
Calculate 30-Day User RetentionHard
Practice

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsDeepgram
Month-End Close ProcessHard

Explain a controlled month-end close, including reconciliations, accruals, variance analysis, review, and GAAP financial statement completion.

Accounting FundamentalsFinancial Statementsfinancial processesDeepgram
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Month-over-Month Creator RetentionMedium
Practice
Practice drill

Calculate monthly active-creator retention from TikTok video interactions using date-based cohorts and aggregation.

Window FunctionsDate FunctionsRetentionTikTok
Retention by Channel SQLMedium
Practice
Practice drill

Calculate Square merchant retention month over month by originating marketing channel using monthly activity aggregation.

Window FunctionsDate FunctionsRetentionSquare
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