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Updated weekly · Last refresh Oct 17

Ericsson Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 11 questions · ~111 min
Longest Substring Without DuplicatesMedium
Practice

Find the longest substring with unique characters using a sliding window and last-seen index map.

deduplicationArraysstring manipulationEricsson
Smallest Missing Positive IntegerMedium
Practice

Find the smallest missing positive integer in O(n) time and O(1) extra space using in-place array placement.

ArraysProblem SolvingArray ManipulationEricsson
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2
System Design10 questions · ~101 min
Design a Real-Time Chat RankerHard

Design the ML system behind a real-time chat app, including message ranking, retrieval, serving, and feedback loops.

InfrastructureRetrievalEricsson
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3
Execution10 questions · ~101 min
Define Launch Success CriteriaEasy

Define clear, measurable launch success criteria before release, aligning stakeholders with different views of what success means.

Success CriteriaRoadmappingQualityEricsson
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4
Security & Infrastructure10 questions · ~101 min
MMU Memory OptimizationMedium

Assesses your understanding of memory management and performance implications at the system level.

memory managementoptimizationEricsson
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5
Behavioral & Leadership3 questions · ~30 min
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6
More topics6 questions · ~61 min
Understanding ACID Properties in DatabasesMedium

Explain the ACID properties of database transactions and their importance.

Ericsson
4G Call Flow ExplanationMedium

Evaluates your telecom knowledge and ability to explain network behavior clearly.

CommunicationEricsson
End-to-End Testing ProcessMedium

Assesses your approach to testing strategy, coverage, and automation.

TestingEricsson
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Above Class AverageEasy
Practice
Practice drill

Use a scalar subquery and aggregation to find Ericsson trainees whose grades exceed the class average.

aggregationData ManipulationsqlEricsson
SQL Top Regions by DowntimeMedium
Practice
Practice drill

Rank regions by completed network downtime for each month and return the top three regions per month.

Window FunctionsDate FunctionsRankingEricssonHHolcim
7-Day Rolling Usage with SQL WindowsMedium
Practice
Practice drill

Calculate Spectrum account usage and 7-day rolling averages with PostgreSQL window functions.

Window FunctionsDate FunctionsData ManipulationEricssonSpectrum
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.