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Perplexity
5 problems across 3 categories
| Done | Title | Difficulty | Updated |
|---|---|---|---|
| Implement Stratified Sampling by Country Data ScientistCoding | Medium | Apr 9, 2026 | |
| Implement Task Dependencies and Failure Software EngineerCoding | Hard | Apr 8, 2026 | |
| Train and improve a scikit-learn binary classifier Machine Learning Engineer | Medium | Dec 15, 2025 | |
| Design trending queries ranking system Software EngineerSystem Design | Medium | Sep 4, 2025 | |
| Design personalized discovery recommendations Software EngineerSystem Design | Medium | Sep 4, 2025 |