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Updated weekly · Last refresh Aug 30

FogHorn Systems Software Engineer Interview Questions

The questions to prepare for a FogHorn Systems Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

26questions
~4htotal time
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1
CodingStart here. 10 questions · ~100 min
LRU Cache for Fast RetrievalMedium
Practice

Implement an LRU cache using a hash map and doubly linked list to support O(1) get and put operations.

Hash TablesSearchingSortingFogHorn Systems
Detect Cycle in Linked ListEasy
Practice

Use Floyd’s two-pointer algorithm to determine whether a singly linked list contains a cycle.

Hash TablesLinked ListsTwo PointersFogHorn Systems
Balanced Brackets CheckEasy
Practice

Use a stack to determine whether an IDT message string contains properly nested and matched brackets.

RecursionStackStringsFogHorn Systems
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2
Execution6 questions · ~60 min
Architect Microservices for IoTHard

Tests decomposition, communication patterns, and operational concerns for IoT microservices.

Trade-offsRoadmappingScope ManagementFogHorn Systems
Ensure Reliability and ScalabilityMedium

Tests your engineering practices for building reliable, scalable software for industrial and commercial IoT.

Trade-offsSuccess CriteriaRisk AssessmentFogHorn Systems
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3
Behavioral & Leadership7 questions · ~70 min
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4
More topics3 questions · ~30 min
Find Trends and InsightsMedium

Tests data analysis approach, statistical thinking, and practical insight generation.

Window FunctionsGroup ByAggregationsFogHorn Systems
Real-Time Device Location TrackingHard

Tests end-to-end system design for streaming location data, state management, and latency constraints.

Feature StoreRetrievalModel ServingFogHorn Systems
Real-Time Multi-Source IngestionHard

Tests system design for low-latency ingestion, ordering, and resilience in edge IoT pipelines.

Stream ProcessingETLOrchestrationFogHorn Systems
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Top Daily Rides by VehicleMedium
Practice
Practice drill

Rank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.

Window FunctionsJoinsData WranglingWaymo
Top-Selling Products by MonthMedium
Practice
Practice drill

Rank Fashion Nova products by monthly revenue using joins, aggregation, date grouping, and RANK.

Window FunctionsGroup ByAggregationsFashion Nova
The finish line: interview-readyComplete all 26 questions plus 3 hands-on drills to finish this plan.