JJ.
Jakub Jarosiński

JakubJarosiński

I am a

Data Engineering, AI Engineering & cool stuff development.

About

Hello there

Full name
Jakub Jarosiński

Welcome to my website. I am an experienced Data Engineer and Software Developer. I have a range of experience working with startups and large international organizations. Currently I'm building reliable data pipelines, agentic workflows and backend services for internal corporate needs. I also lead technical development at the commodity trading startup harvium.pl.

Outside of work I like digging into Cloud Platforms, AI, solid engineering practices, and finance.

Tech I've used

  • Linux
  • Python
  • TypeScript
  • Java
  • Hadoop
  • Spark
  • Databricks
  • Airflow
  • FastAPI
  • React
  • Node
  • SQL
  • PostgreSQL
  • Kafka
  • RabbitMQ
  • LLMs
  • Langchain
  • MySQL
  • MongoDB
  • Docker
  • Azure
  • AWS

Resume

Experience & education

Data engineering roles, software delivery, and a finance-heavy early career.

Work experience

04.2024 — present

Data Engineer

EYContract

  • Optimizing ETL processes
  • SQL & Python development
  • Airflow orchestration
  • System architecture design
  • OpenSearch and data backends for internal tools

08.2024 — 03.2025

Data Engineer

Uniqa Insurance GroupContract

  • Data lake work: Hadoop, Spark, Airflow, YARN, Hue, PostgreSQL, Oracle
  • Python with Spark, Pandas, PySpark
  • Developing pipelines in Airflow

09.2022 — 07.2024

Data Engineer

Polkomtel

  • Data analysis and operational reporting
  • ETL optimization, SQL, Python, Java
  • Spark, NiFi, Kafka, Airflow
  • System architecture, Agile delivery
  • Power BI, Tableau

09.2021 — 04.2022

Data Analyst (Finance)

Franklin Templeton Investments

  • Data and financial analysis
  • Python automation, SQL
  • Analytics in Python, R, Jupyter
  • Power BI

10.2020 — 03.2021

QA Engineer

Match-Trade Technologies

  • Database administration
  • Data analysis and reporting
  • Process automation in Python
  • A/B testing and automated testing
  • Unit testing

05.2020 — 09.2020

Equity Trader

Traderhouse.pl

  • Equity trading on NASDAQ & NSE
  • Scanning for opportunities and executing strategy
  • Fundamental and technical analysis
  • Working with financial data and databases

02.2020 — 12.2021

Marketing Specialist / Web Developer

Dive in life

  • SEO, external contacts, marketing strategy
  • REST APIs in Node.js
  • Full-stack work with React and Node
  • Python automation

04.2019 — 08.2019

Sales Representative

Southwestern Advantage

  • Door-to-door sales and CRM
  • Community relations and sales strategy

Education

2021 — 2023

Masters - Computer Science and Econometrics

Poznań University of Business & Economics

  • Scholarship for the best students (2021, 2022)
  • Student exchange at the University of Ljubljana

2019 — 2021

Masters in Law

Adam Mickiewicz University

  • Completed six semesters in one year while working full time
  • Droped out to pursue career and studies in Computer Science

2018 — 2021

Bachelors - Economics

Poznań University of Business & Economics

  • Member and contributor: SKN Pryzmat, SKN Profit, SKN Portfolio
  • Scholarship for the best students (2020)

Contact

Let's build something ambitious

Email is the best way to reach me. Happy to chat about Data Engineering, Agentic AI, Backend and Software.