Data · Automation · Insight

Turning complex data into systems people can actually use.

I'm Marlon Mejía, a Data Analyst and Automation Engineer based in Warsaw. I build dashboards, data pipelines, and intelligent workflows that move teams from manual work to better decisions.

Now beginningMaster's in Data Science & Business Analytics · University of Warsaw
3+
Years working with data
360°
From source to decision
4
Connected disciplines
Portrait of Marlon Mejía
Based inWarsaw, Poland
CORE STACKSQLPythonPower BIn8nKNIMEArcGIS

01 — Profile

I work where data, automation, and decisions meet.

My strongest work happens when the answer is not simply “build a dashboard.”

I look at the full path: how information is created, where it breaks, what can be automated, and how the final insight should reach the people who need it. That perspective comes from hands-on experience across analytics, data warehousing, ETL, AI evaluation, and geospatial solutions.

I'm naturally curious and self-directed. I've moved across different data disciplines by learning the tools deeply, testing ideas, reading documentation, and improving processes before someone has to ask.

02 — Current chapter

Master's studies · Starting

Data Science & Business Analytics

University of Warsaw

I'm beginning the next stage of my academic journey in Warsaw—deepening the connection between data science, advanced analytics, and the business decisions these technologies are meant to improve.

Graduate studiesUniversity of WarsawWarsaw, Poland
Data ScienceBusiness AnalyticsDecision Intelligence

03 — Expertise

One profile. Four connected disciplines.

I combine technical depth with a practical understanding of the business process behind the data.

01

Data Analytics & BI

Decision-ready dashboards, clear KPI frameworks, and analytical models that connect business questions to reliable answers.

  • Power BI
  • SQL
  • DAX
  • Power Query
02

Data Engineering

Clean, documented data flows—from raw sources to trusted analytical layers—built with quality and maintainability in mind.

  • ETL / ELT
  • Python
  • DWH
  • SAP Data Services
03

Workflow Automation

Practical automations that remove repetitive work, integrate systems, and keep people focused on higher-value decisions.

  • n8n
  • KNIME
  • REST APIs
  • Python
04

AI & Geospatial

Responsible AI evaluation and location intelligence that add a deeper layer of context to operational and strategic problems.

  • Machine Learning
  • AI Audit
  • ArcGIS
  • GeoAnalytics

04 — Credentials

Verified learning, applied in practice.

A focused selection of the training that supports my work across analytics, automation, and international teams.

Certifications & courses

Intensive English Course · C1.1

Foreign Language Centre · Warsaw University of Technology

Languages

SpanishNative
EnglishC1.1
GermanA2

05 — How I work

Built for real-world complexity.

Good data work is not only technically correct. It needs to be trusted, understood, and useful after handoff.

01

Translate

Business needs into data products

I start with the decision that needs to be made, then shape the model, dashboard, or automation around it.
02

Connect

Data across tools and teams

From SQL and enterprise ETL to APIs, Python, and low-code workflows, I connect the pieces into one reliable flow.
03

Improve

Processes before they become problems

I take initiative when I see manual work, recurring errors, or an opportunity to make a process clearer and faster.

06 — Selected work

Selected work, built end to end.

02 completed case studies · Growing

Each case study goes beyond the final screen—showing the source data, architecture, quality controls, modeling decisions, and business purpose.

07 — Contact

Have a data problem worth solving?

I'm open to data, analytics, and automation opportunities where curiosity, ownership, and practical problem-solving matter.