This page walks through a senior software developer interview from first greeting to thank you email. It starts with the hiring context. Companies now hire at middle level and above, and the process has grown harder than a few years ago. The round then moves through seven checkpoints: English, coding, system design, project management, version control, refactoring, and adaptability. Each section lists what the interviewer probes for, such as live coding habits, data structures, caching, atomic commits, and clean code. The closing part covers questions to ask about career paths and promotion, and why a short thank you note is worth sending.
Experience interviewing for a Senior Software Developer role
Overview
- Position: Senior NodeJS/PHP and full-stack
- Observation: Hiring has been tough lately; companies no longer hire fresher/junior, only middle level at minimum
- Process: Harder than a few years ago (possibly because many developers were laid off)
Interview Process
- English: The entire interview is in English
- Coding Proficiency: Good code, optimal solutions, data structures & algorithms (knowledge or live coding)
- System Design and Optimization: Microservices performance, caching strategies
- Project Management: Organizing and planning, tickets/user stories
- Version Control Discipline: Best practices, regular atomic commits, clear messages
- Refactoring Skills: Improve code structure and readability, Clean Code
- Adaptability: Working with an existing codebase and following its standards
Section Details
Greeting
- Research the company beforehand
- Open with a thank-you
- Give a professional, concise self-introduction focused on the skills the company needs
- Common question: Why are you leaving your previous company?
English
- Speak clearly and slowly
- Ask them to repeat if you can't hear well
- Make sure you grasp their meaning
Coding Proficiency
- Know your programming language well
- The interviewer may ask about any technical skill on your CV
- Live coding:
- Communicate with the interviewer continuously
- Read the problem carefully and explain how you understand it
- If you don't know a clever approach, just code something brute-force; a nested loop is fine
- Say that it can be improved in direction xyz
- Data structures: Stack, Queue, Binary Heap, Linked List, Binary Search Tree
- Problem solving: Divide & Conquer, Sliding Window, Recursion, Dynamic Programming
- Architecture: Clean Architecture, DDD, Event-Driven Design
System Design and Optimization
- System design: Notification System, Payment System
- Third-party system integration
- Message queue: Kafka/RabbitMQ
- Caching: Redis/Elasticsearch
- API security: JWT/OAuth
- Microservices: The framework doesn't matter; what matters is understanding what needs to be done and the cost
Project Management
- Write readable User Stories/Tickets (with templates)
- Break down tasks
- Manage time and people
Version Control Discipline
- Best practices for teamwork with git
- Distinguish merging from rebasing
- Tag releases to a standard
Refactoring Skills
- Read messy code and refactor it to be maintainable
- Design patterns
- Refactoring strategy and balancing technical debt
- Write unit tests before refactoring
Adaptability
- A developer's mindset when joining a new project
- Read sample source code and suggest new features or refactors
- The mindset of a senior
End of the Interview
- Frequently asked: Do you have any questions?
- How does the company support career paths?
- How does promotion work?
- Opportunities for onsite work abroad
- Thank and close: Send the company a thank-you email
See also: Senior PHP JavaScript Interview · Top 10 System Design And Microservices Questions · Interview Notes