Data Science Educational Resources
StrataScratch is a data science educational platform with over 1,000+ real interview questions from your favorite companies.
Latest Blog Posts
All articles
A No-Fluff Guide to Polars vs Pandas
Comparing Pandas and Polars using a real Uber business modelling task — here's who came out faster (and by how much).
Nathan Rosidi - May 7, 2025
Why Your ML Job Feels Like a Lie (And What To Do About It)
You thought you’d train models, but now you're writing SQL. This article explains why and how to shift your role toward real machine learning, step by step.
Nathan Rosidi - May 2, 2025
Using Principal Component Analysis in R for Real-World Data
A hands-on guide to using PCA in R with DoorDash data—cleaning, visualising, and modelling compressed dimensions that actually make sense.
Nathan Rosidi - April 23, 2025
Looping Through Lists in Python: A Comprehensive Tutorial
Learn how to loop through a list in Python using real Uber data, practical techniques, and performance-friendly tips.
Nathan Rosidi - April 9, 2025
Career
All Career articlesWhy Your ML Job Feels Like a Lie (And What To Do About It)
You thought you’d train models, but now you're writing SQL. This article explains why and how to shift your role toward real machine learning, step by step.
Nathan Rosidi - May 2, 2025
11 Data Analytics Projects for Every Level
Data analytics projects are great for practicing and showcasing your analytics skills. Here are project suggestions for every level and resources to use.
Nathan Rosidi - March 18, 2025
Dating Your Data Science Team: Red & Green Flags to Watch For
Nathan Rosidi - December 12, 2024
Interviews
All Interviews articlesA No-Fluff Guide to Polars vs Pandas
Comparing Pandas and Polars using a real Uber business modelling task — here's who came out faster (and by how much).
Nathan Rosidi - May 7, 2025
Using Principal Component Analysis in R for Real-World Data
A hands-on guide to using PCA in R with DoorDash data—cleaning, visualising, and modelling compressed dimensions that actually make sense.
Nathan Rosidi - April 23, 2025
Looping Through Lists in Python: A Comprehensive Tutorial
Nathan Rosidi - April 9, 2025
A Comprehensive Step-by-Step Guide to Full Outer Join in SQL
Nathan Rosidi - March 25, 2025
Guides
All Guides articlesA No-Fluff Guide to Polars vs Pandas
Comparing Pandas and Polars using a real Uber business modelling task — here's who came out faster (and by how much).
Nathan Rosidi - May 7, 2025
Why Your ML Job Feels Like a Lie (And What To Do About It)
You thought you’d train models, but now you're writing SQL. This article explains why and how to shift your role toward real machine learning, step by step.
Nathan Rosidi - May 2, 2025
Looping Through Lists in Python: A Comprehensive Tutorial
Nathan Rosidi - April 9, 2025
Companies
All Companies articles
What Does It Take to Be a Data Engineer at Google
Journeying through Skills, Perks, and Application Insights for Aspiring Google Data Engineers
Nathan Rosidi - May 23, 2024
Microsoft SQL Interview Questions
We'll discuss one of the interesting Microsoft SQL interview questions to help prepare you for applying for a role as a Microsoft data scientist.
Nathan Rosidi - October 30, 2023
LinkedIn Data Scientist Interview Questions
Nathan Rosidi - October 30, 2023
40+ Data Science Interview Questions From Top Companies
Nathan Rosidi - October 30, 2023
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