About us
A welcoming space for anyone interested in software — hobbyists and professionals, developers and testers, analysts and tech leads. Meet fellow software enthusiasts at our monthly Social Drinks. Join us and talk about your projects and interests. Or any other subject you like!
Social Drinks
We are meeting up every third Thursday of the month to share knowledge, chat about technical stuff, and to enjoy drinks together. Subscribe to this group to be notified about new events.
Talks
Every month we reserve 20-45 minutes for talks. It is a safe space for first-time speakers, a chance for experienced speakers to try new material, and a testbed for new ideas. Contact us with your idea if you want to give it a shot! Want to do a lightning talk instead? No problem!
Social Media Channels
Slack — To chat in between meetups, share ideas and ask questions;
LinkedIn — To promote our meetup, please consider following our page;
Meetup — This group, subscribe to be notified about new events.
Code of Conduct
We've put together a Code of Conduct. The short version is: "Don't be a jerk."
Upcoming events
4
Leiden.dev • Introduction to the Tech Workers Coalition
Café de Keyzer, Kaiserstraat 2-4, 2311 GR, Leiden, NLSeptember edition;
Techwerkers.nl by Ben Naylor:
An introduction to the Tech Workers Coalition Netherlands. A community of tech workers doing work place organizing, aimed at taking back worker power in the Netherlands.
From engineer and delivery drives to content moderators, customer service agents, warehouse pickers and video game artists; anyone in a tech adjacent role or workplace is welcome to join.Doors open at 19:00
Talk starts at 19:30📅 Thursday, 17 September 2026 🕒 19:00 - 22:00
📍 Café De Keyzer, Kaiserstraat 2-4, Leiden (city center)
❣️ Upstairs3 attendeesLeiden.dev • Reliability of Streaming Pipelines
Café de Keyzer, Kaiserstraat 2-4, 2311 GR, Leiden, NLOctober edition;
Reliability of our Streaming Pipelines; How we took Flink CDC completeness from 92% to 99.78% by Abhishek Jain
In data infrastructure, streaming pipelines capture every database change (inserts, updates, deletes) in real time to keep downstream systems in sync.
We thought ours were 92% reliable, until we realized our measurement was double-counting some changes, hiding actual data loss. Using Global Transaction Identifiers (GTIDs), unique tags for each database transaction, we achieved 99.78% completeness.
This talk covers the pitfalls of duplicate counting, how GTIDs exposed the gaps, and the steps we took to harden our Apache Flink pipelines.Doors open at 19:00
Talk starts at 19:30📅 Thursday, 15 October 2026 🕒 19:00 - 22:00
📍 Café De Keyzer, Kaiserstraat 2-4, Leiden (city center)
❣️ Upstairs4 attendees
Past events
42
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