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Updated weekly · Last refresh Aug 30

SWIFT Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 16 questions · ~148 min
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonSWIFT
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsSWIFT
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2
Execution6 questions · ~55 min
Design Feature for Existing ApplicationMedium

Explain how you would design a new feature in an existing application while managing scope, trade-offs, and success criteria.

Trade-offsRoadmappingScope ManagementSWIFT
Balance Speed, Quality, and ScopeMedium

Describe how you handled a tough trade-off between shipping fast, maintaining quality, and reducing scope.

Trade-offsRisk AssessmentScope ManagementSWIFT
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3
SQL & Data Manipulation4 questions + 3 drills · ~67 min
Database Schema Design ConsiderationsMedium

Tests understanding of normalization, indexing, constraints, and schema choices that support reliable application performance.

JoinsData WranglingAggregationsSWIFT
Optimizing Slow SQL QueriesMedium

Tests your ability to diagnose and improve SQL performance using query and indexing strategies.

Window FunctionsJoinsAggregationsSWIFT
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
Deduplicate Out-of-Order Replication EventsMedium
Practice
Practice drill

Use ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.

Window FunctionsSubqueriesJoinsReplitQuantcast
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
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4
Security & Infrastructure4 questions · ~37 min
VPN Purpose and BenefitsMedium

Assesses understanding of VPN concepts, security goals, and practical benefits.

SWIFT
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5
Behavioral & Leadership18 questions · ~166 min
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6
More topics2 questions · ~18 min
Parallel Computing Application DesignHard

Evaluates system design and concurrency reasoning for parallel workloads.

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