21. - Generative AI:
Score: 5
Qualitative Assessment: Average
Description: Varun's knowledge of generative AI could be expanded, particularly in discussing applications in real-world projects.

22. - Machine learning libraries:
Score: 6
Qualitative Assessment: Average
Description: Varun has basic knowledge of machine learning libraries but needs to demonstrate how he has used these tools to solve complex problems.

23. - API development:
Score: 7
Qualitative Assessment: Good
Description: Varun has good experience with API development, though more detailed discussion on his projects would be beneficial.

24. - Database design:
Score: 7
Qualitative Assessment: Good
Description: Varun's database design skills are adequate, but he could improve by sharing more about his strategic approach to complex database issues.

25. - Neural networks:
Score: 5
Qualitative Assessment: Average
Description: More depth in discussing his practical experience with neural networks would help in evaluating his fit for the role more effectively.