Q161. How would you scale Scrum across multiple teams?
Scaling Scrum is a problem of coordination, not of adding more Scrum. The first question is whether scaling is needed, because more layers often slow delivery. I keep tea...
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Q162. How do you decide what to build next between two competing opportunities?
I compare them against strategy and evidence rather than gut feel. First, do both serve the current strategic goal? An opportunity that is attractive but off strategy com...
Q163. Describe a time you dealt with a customer who was wrong but insisted otherwise.
I separate the relationship from the facts. Being right is not the goal; resolving the issue is. I listen fully and acknowledge their perspective: "I can see why you read...
Q164. How do you assess whether a company is financially healthy?
I look at profitability, liquidity, leverage and cash generation together, because any single ratio can mislead. Profitability: gross and net margin, and the trend over s...
Q165. Explain register allocation in a compiler.
Register allocation assigns the many virtual registers produced by the compiler to the small, fixed set of physical CPU registers. It happens late, after instruction sele...
Q166. How would you analyse and optimise a slow query?
Query optimisation starts by measuring. `EXPLAIN` shows the plan; `EXPLAIN ANALYZE` runs it and reports actual rows and time. Things to look for: sequential scans on larg...
Q167. How do you tell a compelling data story to stakeholders?
Start with the decision the audience needs to make, then structure the narrative around it: situation, complication, question and answer. Lead with the recommendation and...
Q168. Explain the difference between correlation and causation.
Correlation means two variables move together; causation means one produces a change in the other. Correlation is symmetric and measurable with a coefficient, while causa...
Q169. How do you evaluate a regression model?
Choose metrics that match the problem. - MAE: mean absolute error, in the target's units, robust to outliers. - MSE and RMSE: penalize large errors more; RMSE is in targe...
Q170. How do you model a one-to-many relationship in MongoDB?
The answer depends on the size of the "many" side and the access pattern. One-to-few: embed an array of subdocuments. A user with a handful of addresses embeds them, so o...