Dataford
Dataford
Top 28
Prep plan
Updated weekly · Last refresh Oct 17

ESS Software Engineer Interview Questions

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

28questions
~4htotal time
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1
CodingStart here. 7 questions · ~66 min
Reverse a String in PythonEasy
Practice

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

StringsfunctionspythonESS
Synchronous vs Asynchronous ProgrammingEasy

Explain how synchronous and asynchronous programming differ, when each is appropriate, and how async improves I/O-bound throughput.

RecursionQueueStringsESS
Implement Binary SearchEasy
Practice

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

Recursionbinary searchArraysESS
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2
Execution8 questions · ~75 min
Production Debugging ApproachHard

Tests your incident debugging workflow, observability mindset, and risk-aware troubleshooting.

Trade-offsRisk AssessmentScope ManagementESS
System Design PitfallsMedium

Tests your awareness of failure modes and how you prevent them in real systems.

Trade-offsRisk AssessmentScope ManagementESS
Database Design for Large AppsMedium

Tests your ability to model data, choose structures, and plan for performance and integrity.

Trade-offsRisk AssessmentScope ManagementESS
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3
Behavioral & Leadership12 questions · ~113 min
Choosing Your Strongest LanguagesEasy

Tests self-awareness, technical communication, and judgment in matching language strengths to a real engineering problem.

CommunicationOwnershipESS
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4
More topics1 question · ~9 min
Finding Trends in DataMedium

Tests your data reasoning skills and ability to derive actionable insights from data.

Window FunctionsGroup ByAggregationsESS
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Database Indexing Trade-offsHard
Practice
Practice drill

Compare PostgreSQL index strategies by read latency, write overhead, storage size, and an overall cost score.

Trade-offsdatabase optimizationdatabase managementHHostinger InternationalPPorch GroupCapital Technology Group
Database Trade-Offs for DetectionHard
Practice
Practice drill

Compare financial crime detection architectures using joined run metrics, aggregates, NULL handling, and ordered performance results.

fraud detectionTrade-offsdistributed databasesDeloitte
Detect Consecutive Losing StreaksMedium
Practice
Practice drill

Identify bet365 users with consecutive losing bets above a risk threshold using ordered streak grouping.

abuse trackingData Manipulationsql querybet365
The finish line: interview-readyComplete all 28 questions plus 3 hands-on drills to finish this plan.