Koç Holding Software Engineer Interview Guide

For behavioral questions, use Situation, Task, Action, Result. Focus 50% on the technical actions you took, include code examples and architecture decisions, quantify performance improvements, and explain trade-offs you considered.

- **SOLID Principles**: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion - **Big O Notation**: Master time and space complexity analysis (O(1), O(log n), O(n), O(n log n), O(n²)) - **CAP Theorem**: Consistency, Availability, Partition Tolerance trade-offs in distributed systems - **Design Patterns**: Singleton, Factory, Observer, Strategy, Decorator - **Problem-Solving Approach**: Clarify → Examples → Brute Force → Optimize → Code → Test

**Phone Screen (45-60 min)**: 1-2 coding problems, basic data structures and algorithms **Technical Round 1 (45-60 min)**: Data structures, algorithm optimization, edge cases **Technical Round 2 (45-60 min)**: System design or advanced coding problem **Technical Round 3 (45-60 min)**: Domain-specific questions, architecture discussions **Behavioral Round (30-45 min)**: Team collaboration, conflict resolution, project ownership

- Jumping to code without clarifying requirements and edge cases - Not discussing time/space complexity or optimization trade-offs - Ignoring edge cases and error handling in solutions - Poor communication while coding or solving problems - Not testing code with examples or explaining thought process

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