Data / BI portfolio · 5 case studies
From business questions to verifiable findings.
Five projects covering data preparation, sales workflows and interactive dashboards. Inspect the data, formulas and code behind the results.
Портфоліо в дії / 40 секунд
Короткий огляд трьох реальних демо: продажі інтернет-магазину, SaaS-аналітика та операційні сценарії. Відкрийте кейси нижче, щоб самостійно перевірити показники, фільтри та розрахунки.
How do sales change, and which categories generate revenue and gross profit?
Explore dashboardRead case study & SQLRevenue, orders, average order value and gross margin. Month and channel filters update all metrics together. The case compares month length, category contribution and profitability. Apr–Sep 2026 · 1,647 rows.
How can a small team track leads, follow-ups and won sales in Google Sheets?
View workflow & filesОпис кейсу українською
How do inconsistent CSV exports become a traceable, reconciled report?
View workflow & filesОпис кейсу українською
How do users reach activation and payment, and which cohorts return in week 4?
Explore dashboardRead case study & SQLSeparate acquisition and retention views, a first-7-day funnel, W0–W8 retention and cohort drill-down. Unobserved weeks stay blank. 18 signup cohorts · 3 channels · 486 rows.
Where does capacity fall short, and what changes when demand or capacity grows?
Explore dashboardRead case study & SQLA queue of daily capacity shortfalls, route detail and region filters. A scenario calculator uses explicit daily capacity costs. Jul–Sep 2026 · 364 rows. Sensitivity analysis, not a forecast.
From metrics to action
Consistent KPIs, trends and category contribution.
Channels, funnels, eligible cohorts and useful drill-downs.
Explicit assumptions, recalculation and a fair comparison.
Source data, SQLite, SQL and 24 validation checks for the three dashboards.
The cleaning and lead-tracking cases include their own files and verification.