Section 1 - Instruction

Imagine your CEO asks: "How many customers did we gain last month?" You check three different reports and get three different answers: 127, 143, and 98.

Which number do you trust? This confusion happens daily in most companies.

Engagement Message

What's one situation where you saw numbers that didn't match?

Section 2 - Instruction

Bad data costs businesses millions. Teams make wrong decisions, waste time reconciling numbers, and lose trust in their systems. Marketing might target the wrong customers, finance might miscalculate revenue.

The bigger the company, the messier the data becomes without proper engineering.

Engagement Message

What's one business problem an incorrect customer count could cause?

Section 3 - Instruction

Data engineering solves this chaos. It's the discipline of building reliable systems that transform messy, scattered data into clean, trustworthy information for decision-making.

Think of it as quality control for your company's data supply chain.

Engagement Message

What's one way a single trusted customer count could improve decisions?

Section 4 - Instruction

Raw data is like unprocessed ingredients - messy, inconsistent, and hard to use. Data engineering turns these ingredients into a refined product that business teams can confidently consume.

It's the difference between scattered puzzle pieces and a complete picture.

Engagement Message

Does this make sense?

Section 5 - Instruction

Let's trace that customer count backward. The final number combines data from your website, mobile app, sales system, and customer service platform. Each source formats dates differently, defines "customer" differently.

Without engineering, these differences create the conflicting reports we saw earlier.

Engagement Message

Which data-source difference do you think causes the biggest problems?

Section 6 - Instruction
Sign up
Join the 1M+ learners on CodeSignal
Be a part of our community of 1M+ users who develop and demonstrate their skills on CodeSignal