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Alten Spain Mobile Engineer Interview Questions

The questions to prepare for a Alten Spain Mobile Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 26 questions · ~296 min
Reverse a Linked List In PlaceEasy
Practice

Reverse a singly linked list in place using pointer manipulation in O(n) time and O(1) space.

RecursionLinked ListspointersAlten Spain
Two Sum in Unsorted ArrayEasy
Practice

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

Hash TablesArraysStringsAlten Spain
Validate Palindrome Ignoring SymbolsEasy
Practice

Use a two-pointer string scan to check whether a string is a palindrome while ignoring non-alphanumeric characters and case.

ArraysStringsTwo PointersAlten Spain
First Non-Repeating CharacterEasy
Practice

Find the first character in a string that appears exactly once using a hash table in linear time.

Hash TablesMathArraysAlten Spain
Binary Search in Sorted ArrayEasy
Practice

Implement binary search to find a target in a sorted array in O(log n) time.

RecursionMathArraysAlten Spain
Managing Memory in Mobile AppsMedium

Explain how to prevent leaks, reduce retention, and manage object lifecycles in mobile apps.

Hash TablesStackArraysAlten Spain
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2
Behavioral & Leadership5 questions · ~57 min
Shifting Requirements During a SprintMedium

Tests how you handle ambiguity and re-prioritize mid-execution while aligning stakeholders and maintaining delivery momentum.

AgileadaptabilityDealing With AmbiguityAlten Spain
Debugging an Undocumented Legacy SystemMedium

Tests ownership and problem-solving under ambiguity in a poorly documented legacy system, including how the candidate leaves lasting improvements behind.

legacy systemsDebuggingdocumentationAlten Spain
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