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Updated weekly · Last refresh Oct 16

Pattern Software Engineer Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 16 questions · ~140 min
Discuss Complexity of Two SumEasy

Explain the time and space complexity of solving Two Sum with a hash table versus brute force.

ArraysSearchingSortingPattern
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2
SQL & Data Manipulation15 questions + 3 drills · ~161 min
Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityPattern
Handle Nulls in Large JoinsMedium
Practice
Practice drill

Write a PostgreSQL join that preserves all orders and clearly classifies NULL and unmatched customer keys.

null handlinglarge datasetsJoinsPatternSwiggyQuantiphi
Detect Duplicate Customer RecordsMedium
Practice
Practice drill

Identify duplicate customer records within each Pattern ecommerce partner using normalized email addresses.

deduplicationdata cleaningdata accuracyPattern
Rolling 30-Day Sales VolumeMedium
Practice
Practice drill

Calculate each product's daily sales and rolling 30-day sales volume using PostgreSQL date-based aggregation.

Window FunctionsDate FunctionsData ManipulationPattern
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3
Technical Fundamentals4 questions · ~35 min
HTTP and Web Traffic BasicsMedium

Tests your understanding of HTTP fundamentals relevant to ecommerce web and API interactions.

experiencePattern
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4
System Design5 questions · ~44 min
Building a System From ScratchHard

Tests your system design thinking, tradeoffs, and ability to structure a scalable solution.

system designarchitecturePattern
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5
Behavioral & Leadership4 questions · ~35 min
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6
More topics6 questions · ~53 min
Process Improvement in WarehousingMedium

Assesses your ability to improve operational or data workflows through structured problem solving.

process improvementPattern
Cloud Pipelines and Backend ServicesMedium

Evaluates your experience designing and operating data pipelines and backend components in the cloud.

cloud servicesdata pipelinesPattern
Coaching Junior Developers on RESTMedium

Assesses your ability to mentor on REST principles and improve API design quality.

MentorshipPattern
Browser Networking Request FlowMedium

Tests understanding of core web networking and HTTP lifecycle from browser to server.

network requestsbasicstechnical experiencePattern
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.