roksolana_shendiukh
Savant
Top 0.9%
Member Nº 2444
Joined Jun 2026
SQL
Correlated Subquery
Inequality Joins
Existence Checks
Python
Recursion
Dunder Methods
Splitting & Joining
Spark
Outer Joins
Conditional Columns
Null Defaulting
Data Modeling
Event Sourcing
One-to-One
Grain Definition
Pipeline Architecture
Table Formats
Late-Arriving Data
Lambda Architecture
Solved
Milestones
Top 100
Top 4% Python
Top 6% SQL
10 Hire verdicts
50 solved
30 active days
1,059 runs in the past 26 weeksActive days: 47 · Max streak: 18
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Recent solves
Junk and Degenerate Dimensions: Advanced
Data Modeling · hard · lesson
Late-Arriving Data: Advanced
Data Modeling · hard · lesson
The Spark UI: Intermediate, The Five Checks, in Order Challenge 2
Spark · medium · lesson
The Spark UI: Intermediate, The Five Checks, in Order Challenge 1
Spark · medium · lesson
The Spark UI: Intermediate, Reading Shuffle Volume Challenge 2
Spark · medium · lesson
The Spark UI: Intermediate, Reading Shuffle Volume Challenge 1
Spark · medium · lesson
Conformed and Role-Playing Dimensions: Advanced
Data Modeling · hard · lesson
Conformed and Role-Playing Dimensions: Advanced, Cross-Functional Consistency Challenge 1
Data Modeling · hard · lesson
Conformed and Role-Playing Dimensions: Advanced
Data Modeling · hard · lesson
Conformed and Role-Playing Dimensions: Advanced, Outrigger and Mini-Dimensions Challenge 1
Data Modeling · hard · lesson