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HN Services Portugal Software Engineer Interview Questions

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

28questions
~4htotal time
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1
CodingStart here. 9 questions · ~84 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysHN Services Portugal
Two Sum with TargetEasy
Practice

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

Hash TablesArraysStringsHN Services Portugal
Dynamic Programming Problem SolvingHard

Tests ability to derive DP states, transitions, and implement efficient solutions.

RecursionDynamic ProgrammingArraysHN Services Portugal
Big O Notation BasicsEasy

Tests fundamentals of algorithmic complexity and ability to reason about performance.

ArraysSearchingSortingHN Services Portugal
Sequence PredictionMedium

Tests pattern recognition and correctness in algorithmic reasoning.

ArraysSearchingSortingHN Services Portugal
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2
Behavioral & Leadership17 questions · ~159 min
Prioritizing Across Competing Client ProjectsEasy

Tests prioritization under pressure across multiple projects, including trade-off judgment, stakeholder communication, and ownership of outcomes.

OwnershipPrioritizationHN Services Portugal
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3
More topics2 questions · ~19 min
Improve Application PerformanceMedium

Tests performance troubleshooting, measurement, and optimization strategy for software systems.

Trade-offsRisk AssessmentScope ManagementHN Services Portugal
SQL Joins and AggregationsMedium

Assesses SQL proficiency for building correct aggregations and filtering on derived groups.

JoinssqlHN Services Portugal

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
SQL Sort QueryEasy
Practice
Practice drill

Sort Thales Ground Master radar readings by signal strength in ascending order, placing unknown values last.

SortingsqlThales
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
The finish line: interview-readyComplete all 28 questions plus 3 hands-on drills to finish this plan.