Great solution and a clear explanation of how to approach this type of optimization problem with SQL! I really liked how you used window functions, it’s a smart approach.

That said, I think it could be helpful to address a couple of points. For example:

- What happens if the budget is too low to hire even one senior candidate? It might be good to include how to handle that situation.

- How does the query handle ties when multiple candidates have the same salary? Could that affect the cumulative calculations?

Also, for larger datasets, window functions can get pretty slow. Maybe adding a note on performance optimizations, like using indexing or pre-calculating certain values, could be useful for people working on bigger projects.

Overall, this is a really helpful article. Nice work!