All tracks
Turn raw data into reliable decisions
SQL & Data Engineering
Practice SQL, relational modelling, query performance, pipelines, and data-quality reasoning for analytics and engineering roles.
Best for: Backend, analytics, data, and AI candidates who need strong data foundations.
Core skill path
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This week
Repair the hiring funnel report
Correct joins, remove duplicate counts, and choose indexes for a broken analytics query.
Take the challenge →Coding checks
The first practical coding set will focus on:
SQL joins
Window functions
Schema design
Pipeline validation
Coding Beta is rolling out track by track.
What you will prove
Write correct analytical SQL
Model transactional data
Diagnose slow and unreliable pipelines