Data Analyst & BI Developer

Jakub Martinec

I turn data into unified numbers and reports companies rely on to make decisions.

For e-commerce and retail companies with plenty of data but few consistent answers. 15 years of experience — Power BI, BigQuery, GA4 + GTM.

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What I do

One set of numbers for the whole company

I connect data from your e-shop, ERP, GA4, marketing and warehouses so that management, sales and marketing all see the same revenue, margin and stock.

Reports people actually use

Power BI dashboards and KPIs for management, marketing, purchasing and stores — not another report nobody opens.

Automation & AI in practice

Automated data checks, anomaly alerts and report commentary.

What I solve

Typically in companies where revenue, margin and stock live in five different reports — and nobody trusts the same number.

  • Dashboards for managing e-shop performance
  • Automated product ranking for the e-shop
  • Price monitoring integrated into pricing
  • Identifying dead stock and relocating goods between warehouses
  • Profitability by store, category and customer
  • Demand forecasting and stock-turn management

How I work

Project-based — from the data foundation to a team that keeps the system running.

  1. Audit

    I find duplicates, KPI inconsistencies, manual exports and the biggest opportunities.

  2. Data foundation

    Unified metric logic, source integration and a solid data model.

  3. Reporting rollout

    Dashboards and KPIs for management and teams, deployed into daily operations.

  4. Handover & team

    Documentation, training for your in-house team and support as needed.

Experience

15 years in e-commerce and retail. I translate business needs into data and automate what genuinely saves time and money.

Sportisimo 7 years

Led the analytics, UX and design team for the main e-shop — 8 in-house people plus contractors. A mix of web analytics and BI on e-commerce and marketing data; over that time the e-shop grew past one billion CZK in revenue and expanded across the European market.

Rock Point

Built BI and reporting from the ground up — from source integration to Power BI dashboards, managing contractors in collaboration with the in-house e-commerce team.

Tools

  • Power BI reporting and dashboards
  • BigQuery & SQL data models and transformations
  • GA4 + GTM web and marketing analytics
  • AI faster, automated data work

Contact

Book a 30-minute consultation
Send an e‑mail +420 727 872 060 LinkedIn

Billing details

Jakub Martinec
Company ID (IČO): 88305031
Kašperskohorská 126
341 93 Rejštejn
Czech Republic

Office

Besední 25
Kašperské Hory 341 92
Czech Republic
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