PTT Public Company 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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