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Tech Interview Questions You Must Know 

October 23, 2025

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Preparing for a tech interview can feel overwhelming. From coding challenges to system design discussions, recruiters want to see not only your technical skills but also how you think, communicate, and solve problems. At ecs, we’ve gathered some of the most common and critical interview questions you must know before stepping into your next tech interview. 

1. Core Technical Questions 

Every role has its fundamentals. Expect questions like: 

  • Explain the difference between processes and threads. 
  • What’s the difference between REST and GraphQL APIs? 
  • How does load balancing work? 

For developers, you may face language-specific questions like Java memory management, Python decorators, or C# async/await. 

2. Problem-Solving & Coding Challenges 

Be ready to write or explain code. Common examples include: 

  • Reverse a linked list. 
  • Detect a cycle in a graph. 
  • Optimize database queries. 

Tip: Practice on platforms like LeetCode, HackerRank, or CodeSignal to sharpen problem-solving speed. 

3. System Design Questions 

For mid to senior-level roles, system design is a must. Examples: 

  • Design a URL shortener like Bitly. 
  • How would you architect a real-time chat application? 
  • Scale an application to handle 1 million concurrent users. 

Interviewers want to see your ability to balance scalability, reliability, and cost. 

4. Cloud & DevOps Focused Questions 

If you’re interviewing for cloud, infrastructure, or DevOps roles, expect questions like: 

  • What’s the difference between AWS EC2, ECS, and EKS? 
  • How do you design a CI/CD pipeline? 
  • What’s the role of Infrastructure as Code (IaC) with Terraform or ARM templates? 

5. Behavioral Questions 

Tech interviews aren’t just about code. Companies want team players. Expect questions such as: 

  • Tell me about a time you faced a technical challenge and how you solved it. 
  • How do you handle tight deadlines? 
  • Describe a situation where you disagreed with a team member—how did you resolve it? 

6. Latest Trends & Knowledge 

Stay updated on emerging topics. You may get questions like: 

  • What are the benefits of Zero Trust Security? 
  • How does serverless architecture differ from traditional cloud hosting? 
  • What role does AI/ML integration play in DevOps pipelines? 

Final Word 
Tech interviews test more than just your coding—they test your problem-solving, communication, and adaptability. By preparing for these common questions, you’ll walk in with confidence and stand out from the competition. At ecs , our goal is to help you stay ahead in your career by knowing what to expect and how to prepare. 

 

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