Q11. How does binary search work and what are its pitfalls?
Binary search finds a target in a sorted array by halving the search range each step, giving O(log n). ```python def binary_search(nums, target): lo, hi = 0, len(nums) - ...
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Q12. What is a funnel analysis and how do you build one?
A funnel measures how many users progress through an ordered sequence of steps, such as view, add to cart, checkout and purchase. The conversion rate at each step shows w...
Q13. What is the difference between Docker volumes and bind mounts?
Both persist data outside the container's writable layer, but they are managed differently. - Volumes are stored in a Docker-managed location under /var/lib/docker/volume...
Q14. What is the difference between ARM templates and Bicep?
ARM templates are the native JSON declarative language for Azure Resource Manager. Bicep is a domain-specific language that transpiles to ARM JSON. Advantages of Bicep: -...
Q15. What is a dead-letter queue and when should you use one?
A dead-letter queue (DLQ) is a separate queue that receives messages a consumer cannot process after exhausting retries. It prevents one poison message from blocking a pa...
Q16. How do you make an interface fully keyboard accessible?
Every interactive element must be reachable and operable with the keyboard alone. Native elements such as button, a[href], input, select and textarea are focusable and ha...
Q17. What is a shebang and why does it matter?
A shebang is the first line of a script, beginning with `#!`, that names the interpreter used when the file is executed directly. ```bash #!/usr/bin/env bash ``` Using `/...
Q18. What are semantic HTML elements and why do they matter?
Semantic elements describe their meaning rather than only their appearance: header, nav, main, article, section, aside, footer, figure, time, button. Benefits: - Accessib...
Q19. How do you design a KPI dashboard that people actually use?
Start from decisions, not charts. Ask what action each viewer takes and which questions they need answered. Principles: - Lead with a small number of headline KPIs, then ...
Q20. How does BigQuery separate storage and compute?
BigQuery is a serverless, columnar data warehouse built on a separation of storage and compute. - Storage: data lives in Capacitor, a columnar format backed by Colossus d...