Data Analyst & Bloomreach Consultant · Prague
Data moves the world.
12+ years working with data in banking, e-commerce, and betting. I help online stores (mostly on Shoptet) bring orders, marketing, and CRM data into one place — and turn them into decisions, not just charts. Open communication, transparency, and long-term collaboration above all.
What I do
consolidation → dashboard → decisionData consolidation
Connecting Shoptet, Google/Facebook Ads, Sklik, e-mail marketing, and GA into a single source via Keboola.
BI dashboards
Looker Studio, Tableau, Excel — numbers you can actually make decisions from, not just look at.
E-mail marketing & Bloomreach
Setting up and automating campaigns in Bloomreach Engagement, connected to real customer data.
Advanced web analytics
Google Analytics, BigQuery — a deeper look at store behaviour than default reports give you.
Databases & CMS
Database design, WordPress, Prestashop — the foundation everything else stands on.
Process automation
Optimising data flows so numbers don't have to be pulled by hand every time.
Career
2011 — presentTools
References
what clients sayI worked with Mr. Jenšík on BI for my project, FerMato. I needed to bring all the numbers into one place and start making more decisions based on them. Mr. Jenšík collected all my data into one place in Keboola and then built a frontend for it in Looker Studio. Exactly as we agreed. Very satisfied.
Martin worked with us on a BI solution for online stores. He designed and built the data warehouse, prepared the SQL data transformations, and visualised the resulting data using the open-source tool Apache Superset. Working with him was seamless — whatever we agreed on always held. He's reliable, technically very capable, and understands business needs well.
We worked with Martin on a BI project for e-commerce platforms, where he designed the data warehouse and ETL processes in SQL. He also built visualisations in the open-source tool Apache Superset. The collaboration went smoothly, Martin is reliable, and communication with him was seamless. We'd be happy to continue working with him in the future.
We work with Martin on e-mail marketing for Slons.sk, Ksporting.cz,
and Outlet-Alpine.cz. He mainly helps us with e-mail and omnichannel
communication automations that make our customer communication
significantly more efficient.
Right now we're also working
with Martin on our own e-mail sending solution, built using AI and
vibe coding. The goal is to have more control over the whole solution
while gradually lowering costs. We especially value the collaboration
for his practical approach and experience.