Q31. What are DAU, MAU and the stickiness ratio?
DAU is daily active users, the number of unique users who perform a meaningful action in a day. MAU is the same over a month. The action must be defined consistently: a l...
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Q32. How do you implement safe rollbacks in a delivery pipeline?
Make rollback a first-class, automated, and tested operation. - Immutable artefacts: deploy versioned images or packages so you can redeploy the previous one exactly. - D...
Q33. How do ARIA live regions announce dynamic content?
Live regions announce content that changes without a page reload, such as form errors, toast messages, search result counts or a chat log. The aria-live attribute has val...
Q34. Tell me about a time you had to learn something quickly.
Show a learning system, not just a story. Example: "We inherited a Go service with no tests and I had never written Go. I gave myself three days: I read the standard libr...
Q35. Tell me about a time you made a mistake.
Own it fully and show the learning. Use STAR but with the emphasis on accountability and change. Example: "I shipped a database migration without a rollback plan and a mi...
Q36. How do you make a site accessible and responsive?
Accessibility essentials: - Use semantic elements and a logical heading order. - Provide alt text for meaningful images and empty alt for decorative ones. - Ensure colour...
Q37. How do you handle missing data in an analysis?
First understand why data is missing, because the mechanism determines the right approach. - MCAR: missing completely at random, safe to drop rows with a small loss of po...
Q38. Explain Bayes theorem with a practical example.
Bayes theorem updates a belief given evidence: P(A|B) = P(B|A) * P(A) / P(B). The prior P(A) is your initial belief, the likelihood P(B|A) is how probable the evidence is...
Q39. What are replica sets and how do they provide high availability?
A replica set is a group of nodes holding the same data: one primary and two or more secondaries. All writes go to the primary. Secondaries replicate the oplog and can se...
Q40. How do you design a highly available GKE cluster?
Plan for node, zone, and control-plane failures. - Regional cluster: the control plane is replicated across three zones and nodes spread across zones, so a single zone ou...