Description

I have over a 5 years of experience in designing, developing, and maintaining data-driven and production-ready web applications in enterprise environment.

What I build (also review and refactor):

R/Shiny web applications with custom HTML, CSS/Sass, JavaScript, and SQL
R and Python data, analytical and modeling workflows
R packages and Python modules
CI/CD pipelines

How I enhance my work:

Use GitHub and Azure DevOps for version control and automation
Containerize development and deployment workflows using Docker
Collaborate in Agile Scrum teams (sprint planning, stand-ups, retrospectives)

Personal site and GitHub profile under active development and available soon.

Languages

English
Native or bilingual
Polish
Native or bilingual
Spanish
Basic

Workplace preferences

Can work on-site

Barcelona (up to 50km)

Freelance (Self employed)
R/Shiny and Python Developer
February 2026 - Today (5 months)
Barcelona, Spain
Designing and maintaining R/Shiny applications for data exploration and reporting.
Building data, analytical and modeling workflows in R and Python.
Implementing CI/CD pipelines and containerized deployments using Docker.
Reviewing and refactoring existing R/Shiny and Python codebases.
R Shiny Python Data science CI/CD
Kantar
Software Developer / Senior Data Scientist
April 2022 - December 2024 (2 years and 8 months)
Barcelona, Spain
Designing, developing and maintaining ETL and data modeling processes (Python / R) and analytical apps (Shiny).
Communicating and collaborating with project managers, business analysts and other dev teams.
General data science and analytics.
R Shiny Python ETL CI/CD
Kantar
Senior Data Scientist
October 2019 - March 2022 (2 years and 5 months)
Warsaw, Poland
R / Shiny and Python developing, data science and analytics.
Developing and maintaining ETL processes (R / Python) and analytical web apps (Shiny).
Creating and updating packages (R / Python).