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Updated weekly · Last refresh Aug 30

Frontier Software Engineer Interview Questions

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

41questions
~6htotal time
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1
CodingStart here. 4 questions · ~34 min
Two Sum with Hash MapEasy
Practice

Find two indices whose values sum to a target using a hash table in O(n) time.

Hash TablesArraysSortingFrontier
Write Java Data Processing FunctionEasy

Tests practical coding skills in Java and your ability to transform inputs correctly.

javadata processingFrontier
OOP, SOLID, Data Structures, AlgorithmsHard

Tests your fundamentals across OOP design, SOLID, algorithms, and service-oriented development.

Data StructuresoopFrontier
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2
Security & Infrastructure6 questions · ~51 min
Troubleshoot VOIP Issue ExampleMedium

Evaluates your ability to diagnose and resolve VoIP problems in production-like systems.

Problem SolvingvoipFrontier
Typical Application Stack Deep DiveHard

Tests your ability to design and reason about scalable, reliable application infrastructure.

InfrastructureFrontier
Telecom Networking FundamentalsMedium

Assesses your foundational networking knowledge relevant to telecom connectivity.

NetworkingprotocolsFrontier
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3
Behavioral & Leadership29 questions · ~245 min
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4
More topics2 questions · ~17 min
Optimize a Slow Database QueryMedium

Tests your ability to diagnose performance issues and improve query efficiency safely.

database optimizationsqlFrontier
q on q SQL QuestionMedium

Assesses your SQL and data manipulation understanding for ambiguous or specialized terminology.

Data AnalysisFrontier

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Audit Inherited Spreadsheet ExceptionsMedium
Practice
Practice drill

Audit an inherited spreadsheet by reconciling source records to flag missing, duplicate, and invalid rows.

PivotData WranglingQualityFrontier
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
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