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Sigmoid Software Engineer Interview Questions

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

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 7 questions + 2 drills · ~78 min
Second Highest Without AggregatesHard
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Recently asked

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsSigmoid
Second-Highest Sales Per CategoryMedium
Practice
Practice drill

Use RANK and joins to find every transaction tied for second-highest value within each retail category.

Window FunctionsRankingAggregationsSigmoid
SQL Data Quality ChecksHard
Practice
Practice drill

Detect missing fields, duplicate transaction keys, invalid amounts, and merchant reference issues with PostgreSQL CTEs and joins.

Data Qualitynull handlingdata integritySigmoid
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2
Execution3 questions · ~25 min
Choose Cloud Scaling StrategyMedium
Recently asked

Explain horizontal vs vertical scaling in cloud environments and how you would choose between them for a production service.

horizontal scalingvertical scalingcloud scalingSigmoid
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3
Coding27 questions · ~224 min
C++ Polymorphism DifferencesMedium
Recently asked

Tests C++ language knowledge and ability to reason about dispatch mechanisms.

abstractionoopcppSigmoid
BST Pair Sum CountingMedium
Recently asked

Tests data structure traversal and efficient counting logic on trees.

Hash TablesbstTwo PointersSigmoid
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4
Pipelines4 questions · ~33 min
PySpark Transformations vs ActionsMedium
Recently asked

Tests Spark execution model understanding and ability to reason about performance.

basicssparkSigmoid
Optimize a Slow Spark JobHard
Recently asked

Tests distributed data processing performance tuning and Spark execution understanding.

cachingsparkshufflesSigmoid
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5
Behavioral & Leadership7 questions · ~58 min
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6
More topics2 questions · ~17 min
Docker and Kubernetes CI/CD on AWSMedium

Assesses infrastructure understanding and ability to operationalize deployments.

kubernetesdockerawsSigmoid
Design a Chess Game InterfaceMedium

Assesses system thinking and API/interface design for a complex domain.

Sigmoid
The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.