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Garmin Interview Questions

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

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1
CodingStart here. 5 questions · ~50 min
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersGarmin
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2
SQL & Data Manipulation4 questions + 2 drills · ~60 min
Reconcile Garmin Invoice DiscrepanciesMedium
Practice

Use joins, a CTE, and CASE logic to flag invoice discrepancies between Garmin ERP invoices and payment records.

Data WranglingAggregationsQualityGarmin
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
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3
Execution5 questions · ~50 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 ManagementGarmin
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4
Pipelines5 questions · ~50 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityGarmin
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5
Metrics5 questions · ~50 min
Critical Metrics for Product LaunchMedium

Choose the most important launch metrics, balancing early signals, long-term outcomes, and a clear KPI hierarchy.

KPIsConversion RateLeading IndicatorsGarmin
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6
Product Sense5 questions · ~50 min
Designing for Accessibility at ScaleMedium

Approach for building accessibility into product design through user needs, research, use cases, and measurable outcomes.

User NeedsPain PointsUse CasesGarmin
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7
More topics21 questions · ~210 min
Sizing an Untapped Product MarketHard

Framework for estimating TAM, adoption, and revenue for a new product launch in an untapped market.

revenue modelnew product launchMarket SizingGarmin
Design an LLM Serving PlatformHard

Design an LLM serving system that balances latency, cost, scalability, and safety for production traffic.

Cold StartFeature StoreModel ServingGarmin
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.