Hello!
We invite you to the 28th meetup of the Trójmiasto Data Community Group!
The event will take place at the Gdynia office of our sponsor – DNV!
During the meetup, we’ll delve into the details of the Delta Lake format and hear about the challenges of migrating solutions to the cloud.
Participation is, as always, free of charge, but for logistical reasons we kindly ask you to register via Meetup and arrive before 6:00 PM.
Public transport: the nearest SKM station is Gdańsk Przymorze Uniwersytet.
Most convenient parking: Olivia Business Centre parking lots – details: https://www.oliviacentre.com/o-nas/parkingi/
Event details
📅 Date: Wednesday, June 11
⏰ Time: 6:00 PM
📍 Location: DNV Office, Łużycka 6E, Gdynia
This is Building C (the one with the DNV logo on top). The event room is on the ground floor – to the left after entering the building.
Nearest SKM station: Gdynia Redłowo.
Parking: along Łużycka Street (there should be spots available at this hour).
Agenda
18:00 – 18:15 Introduction and organizational announcements
18:15 – 19:15 Tadeusz Balcer – Delta Lake: A Standard for Working with Large Sets of Structured Data
The Delta Lake format, an extension of Parquet, allows efficient work with massive structured datasets.
Originally designed for Apache Spark, it is now also supported by engines like DuckDB and Polars, which can process data efficiently on a single machine.
Using open ship movement data, Tadeusz will demonstrate how Delta Lake works, how to optimize query performance through proper configuration, and how powerful Polars can be when working with this format.
19:15 – 19:25 Q&A
19:25 – 19:35 Break
19:35 – 20:35 Grzegorz Brodny – The Slow Migration of BI: Between Quick Wins and Tech Debt
In this session, the speaker will walk attendees through a multi-year project of migrating and maintaining a BI solution originally built on Microsoft’s tech stack: SQL Server, SSIS, SSAS, and SSRS.
Over time, the solution was gradually moved to AWS cloud – in stages, using various approaches and experiencing many twists and turns.
The presentation will cover architectural changes, design decisions, technical and organizational challenges, and the impact of evolving customer requirements.
This is a technical and architectural session – a story of real-world decisions, compromises, and lessons learned. Perfect for anyone curious about what a BI migration really looks like in large organizations.
20:35 – 20:45 Q&A
20:45 – 22:00 Pizza & Networking
Our speakers:
Tadeusz Balcer
Tadeusz is a software engineer at DNV, specializing in designing algorithms for processing large datasets.
Grzegorz Brodny – Leader of the Trójmiasto branch of Data Community. Senior Data Engineer at Future Processing.
He has over 12 years of experience in building Business Intelligence solutions – from gathering requirements and writing ETLs to solution modeling.
He has mainly worked with Microsoft tools (SQL Server, SSIS, SSAS) and has been working with AWS cloud solutions for the past 3 years.
Professionally passionate about ETL optimization, columnstore indexes in SQL Server, and the Delta format. A fan of simple solutions.
He also holds a PhD in computer science in the field of Affective Computing.
Submit your topic!
Do you have knowledge you’d like to share? Want to explore an interesting subject, share a case study, or try your hand at public speaking? Get in touch with us – we offer full support! Email us at trojmiasto@datacommunity.pl.
You’re very welcome to join us!
Join by meetup!
Hello!
We invite you to the 29th meeting of the Tricity Data Community Group!
The meeting will take place at the Gdynia office of DNV!
More details about the event will follow soon.
Participation in the event is, as always, free of charge, but due to logistical reasons, we kindly ask you to register via Meetup and arrive before 6:00 PM.
Event Details
📅 Date: Wednesday, September 17
⏰ Time: 6:00 PM
📍 Location: DNV Office, Luzycka 6E, Gdynia
Agenda
6:00 PM – 6:15 PM Introduction and organizational matters
6:15 PM – 7:15 PM Presentation #1
7:15 PM – 7:25 PM Questions and Answers
7:25 PM – 7:35 PM Break
7:35 PM – 8:35 PM Presentation #2
8:35 PM – 8:45 PM Questions and Answers
8:45 PM – 10:00 PM Pizza & Networking
Our Speakers:
Details coming soon.
Submit Your Topic!
Do you have knowledge you want to share with others? Interested in exploring an exciting topic, sharing a case study, or trying your hand as a speaker? Contact us – we offer full support! Write to us at trojmiasto@datacommunity.pl.
We warmly invite you!
Join by meetup!
We would like to invite you to the SQLDay Lite 2025 conference, which will take place on 16-17 October 2025.
The conference will take place in Bielsko-Biała, the venue is still being determined.
Details will soon be available on the event page.
Event page