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Explain Principal Component Analysis. What are its disadvantages?

Create a distributed platform for managing feature flags.

Develop a payment processing system for in-app purchases.

Which optimization techniques are in your toolkit, and how do they generally function?

Can you create a code snippet that simulates rolling a fair die and explain how to test its fairness?

How do you construct a binary search function and analyze its time complexity? Could you further refine the algorithm?

How do bias and variance factor into decision trees? Plus, which one is more problematic - high bias or high variance - and how do you justify that?

Can you walk me through the sequence of steps you take when performing ETL?

How is information theory utilized in the assessment of language models, and can you illustrate its use with a comparative model evaluation?

Can you mention a selection of optimization algorithms you're versed in? How would you go about optimizing a scenario with an extremely large variable set, say a million? How does the simplex method facilitate solving linear optimization problems?