Top 17
Prep plan
Updated weekly · Last refresh Aug 30

Lean Solutions Group Software Engineer Interview Questions

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

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1
CodingStart here. 7 questions · ~77 min
Reverse String Without Built-insEasy
Practice

Reverse a string using basic iteration and swapping, without built-in reverse helpers.

Basic Algorithmsfunction implementationStringsLean Solutions Group
Move Zeros to Array EndEasy
Practice

Use a two-pointer in-place approach to move all zeros to the end while keeping non-zero elements in order.

ArraysSortingTwo PointersLean Solutions Group
First Non-Repeated CharacterEasy
Practice

Use a hash table frequency count and a second pass to return the first non-repeated character in a string.

Hash Tablesfrequency countStringsLean Solutions Group
Spring Boot Bean LifecycleMedium

Tests deep knowledge of Spring IoC, bean creation flow, and dependency injection behavior.

dependency injectionspring bootLean Solutions Group
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2
Behavioral & Leadership7 questions · ~77 min
Balancing Technical Debt and DeadlineMedium

Tests prioritization under pressure, technical judgment, and stakeholder management when technical debt threatens a client deadline.

client deadlineConflict Resolutiontechnical debtLean Solutions Group
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3
More topics3 questions · ~33 min
Banking Transaction Locking StrategiesEasy

Explain optimistic and pessimistic locking for banking transactions, including tradeoffs, failure handling, and when each approach is appropriate.

JoinsData WranglingCase WhenLean Solutions Group
Your Background and FitEasy

Tests communication clarity and how your experience maps to BASF’s machine learning engineering needs.

RoadmappingScope ManagementLean Solutions Group
Avoiding N+1 in Spring Data JPAMedium

Tests query optimization skills and understanding of ORM loading behavior.

null handlingJoinsperformanceLean Solutions Group

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 17 questions plus 3 hands-on drills to finish this plan.