04.2024 — present
Data Engineer
EYContract
- Optimizing ETL processes
- SQL & Python development
- Airflow orchestration
- System architecture design
- OpenSearch and data backends for internal tools
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
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)
Portfolio
Selected projects
Experiments, products, and deep dives — some older demos preserved as static pages.
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.