Top 50
Prep plan
Updated weekly · Last refresh Aug 30

Illumina Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 22 questions · ~211 min
Two Sum ProblemEasy
Practice

Find two indices in an array whose values add up to a target using a hash map.

Hash TablesArraysTwo PointersIllumina
Implement Binary Search AlgorithmEasy
Practice

Write a binary search function to find a target value in a sorted array.

SearchingIllumina
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2
Execution14 questions · ~134 min
Design a Scalable ApplicationEasy

Explain how you would design a scalable application, including trade-offs, risks, stakeholder needs, and how you define success.

Trade-offsRisk AssessmentScope ManagementIllumina
Choose Monolith or MicroservicesMedium

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope ManagementIllumina
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3
Security & Infrastructure3 questions · ~29 min
Security and Infrastructure: PLC and GMPMedium

Assesses your understanding of industrial instrumentation and compliance-related concepts.

safetyIllumina
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4
Behavioral & Leadership6 questions · ~58 min
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5
More topics5 questions · ~48 min
Handling Missing Data in PipelinesMedium

Approach for handling missing data in an ML data pipeline, including validation, imputation, and safe downstream consumption.

InfrastructureETLBatch ProcessingIllumina
Solve a Visually Different ProblemMedium

Tests structured problem solving and ability to adapt to a visually different product context.

product designProblem SolvingIllumina
Analyze Two Sets of DataMedium

Assesses data analysis approach and ability to compare datasets effectively.

Data AnalysiscomparisonIllumina
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.