Scalendar October 2025

Event-driven Newsletter

October’s Scalendar is packed with Scala meetups in Warsaw and Oslo to heavyweight gatherings like Devoxx Belgium, React Alicante, and the International JavaScript Conference in Munich. Add in cross-disciplinary events on AI, software craftsmanship, and developer culture in Barcelona, Copenhagen, and Atlanta, and you’ve got a month that blends deep technical insights with community-driven energy.

Whether you’re leveling up with workshops, hacking on open source, or just grabbing a beer with fellow devs, October brings plenty of chances to connect and recharge your skills.

Scala conferences in October 2025

Weekly Global AI Sessions with LLM4S

• Weekly -> starting from October 05, 2025
• Online
• https://luma.com/calendar/cal-Zd9BLb5jbZewxLA

Starting October 5, 2025, join a recurring series of weekly online meetups exploring LLM4S – a Scala-first AI toolkit for building intelligent agents and LLM-powered applications

The sessions are hosted by Rory Graves (Scala advocate, compiler contributor, and long-time mentor) and Kannupriya Kalra (backend engineer, community leader, and conference speaker), who bring decades of combined expertise in Scala, functional programming, and AI.

Expect live coding on agent workflows, RAG systems, and multimodal apps, along with practical insights into tracing, logging, and best practices. Plus, open discussions on the LLM4S ecosystem, Dev Hours, and Google Summer of Code projects.

Perfect for both newcomers to Scala and developers already experimenting with AI-driven systems, this series offers not just tools but also a global community to grow with.

Scala-Pils | scalabin

• October 01, 2025
• Oslo, Norway
• https://www.meetup.com/scalabin/events

Scala-Pils is a casual monthly meetup (every 1st Wednesday) where Scala developers and tech enthusiasts gather to chat and enjoy a beer together. Expect open discussions, informal talks, and relaxed networking in a friendly, low-pressure setting. Free and open to all, whether you’re a seasoned Scala dev or just curious about functional programming.

Bi-monthly virtual meetup | The Atlanta Scala Meetup Group

• October 08, 2025
• Online
• https://www.https://www.meetup.com/atlanta-scala
  

The Atlanta Scala Meetup welcomes Scala enthusiasts, functional programmers, and distributed systems aficionados to their bi-monthly online gathering. The format is flexible (mix of talks, workshops, and open discussion), and the event is free with plenty of slots available.

ScalaBridge Autumn 2025 Start! | ScalaBridge London

• October 08, 2025
• London, UK / Online
• https://www.meetup.com/scalabridge-london/events

ScalaBridge London kicks off its Autumn 2025 term with a hybrid-friendly session hosted by SiriusXM. This meetup shifts toward a more hands-on, project-driven format: attendees will choose coding projects to work on, collaborate in small groups, and explore Scala’s features together. Whether you’re just starting out or looking to deepen your Scala practice, this is a great opportunity to join a supportive learning community.

ScalaWAW #36 – Scala Plugin for IntelliJ hackathon 

• October 09, 2025
• Warsaw, Poland 
• https://www.meetup.com/scalawaw/events
  

Join the ScalaWAW community at Hala Koszyki for an evening hackathon dedicated to contributing to the Scala plugin for IntelliJ. The event features “up for grabs” tickets, guidance from plugin team members, and a setup tutorial. Whether you’re already active in OSS or curious to get started, this is a great chance to collaborate, learn, and make real contributions. Pizza, snacks, and drinks provided – just bring your laptop and charger. 

Scala Discussion and Conversation | Dallas Scala Enthusiasts

• October 10, 2025
• Online
• https://www.meetup.com/dallas-scala-enthusiasts/events
  

This is a casual, community-driven meetup (via Zoom) where Scala enthusiasts of all skill levels are invited to share topics, ask questions, or even give a brief presentation. The session emphasizes open discussion, peer learning, and networking. Free to attend – just sign up and join the conversation.

RJUG #53 | Rzeszów Java User Group

• October 15, 2025
• Rzeszów, Poland 
• https://www.meetup.com/rzeszow-java-user-group
  

Join the Rzeszów Java User Group for their 53rd meetup focused on real-world strategies for scaling applications in Kubernetes. Bartosz Rybacki will walk through autoscaling, using examples from a Trino deployment. Whether you’re a Java backend engineer, DevOps practitioner, or Kubernetes enthusiast, this session offers valuable insights and lessons learned from production environments. Free entry and a chance to network with like-minded professionals. 

Scala Talks: Tour of error handling & FP at huge companies | London Scala User Group

• October 15, 2025
• London, UK / Online
• https://www.meetup.com/london-scala/events
  

Join the London Scala User Group for an insightful evening featuring two talks: “A Comprehensive Tour of Error Handling in Scala” by Jacob Wang, and “Starship Enterprise: Functional Programming at Huge Companies” by Jack Higgs.
You’ll get both theoretical depth and real-world lessons from enterprise Scala adoption. The event also includes free food/drinks, social time, and an optional pub meetup after. A livestream option is provided for virtual attendees.

Software Architecture

Devoxx Belgium 

• October 06-10, 2025
• Antwerp, Belgium
• https://devoxx.be/
  

Devoxx Belgium returns to Antwerp for its 2025 edition, focusing on the evolution of software development in the age of AI agents and Java advancements. This year, the conference highlights agentic workflows, autonomous systems, and the latest features in Java 25, including Stable Values and enhanced Structured Concurrency. Attendees can expect a rich program featuring Deep Dive sessions, Hands-on Labs, Tools-in-Action, and Birds-of-a-Feather (BOF) sessions, covering topics from LLM-based agent libraries to multi-agent architectures. With a sold-out status for most ticket types, the event promises to be a hub for developers to explore cutting-edge technologies and network with industry experts.

Atlanta Developers’ Conference

• October 11, 2025
• Atlanta, USA
• https://dev.events/conferences/atlanta-developers-conference-2025-r9bq-ww
  

The Atlanta Developers’ Conference is a community-driven event designed for developers of all backgrounds. This year’s conference will feature a keynote titled “The Next Wave of Innovation,” exploring how emerging technologies are reshaping work culture and how developers can contribute to building meaningful tech careers and thriving work environments. The conference will also include a diverse lineup of sessions covering various topics in software development. The event aims to foster learning, networking, and collaboration among developers. 

The Future of Software  

• October 06-10, 2025
• Copenhagen, Denmark
• https://www.thefutureofsoftware.com/copenhagen
  

The Future of Software Conference is Copenhagen’s premier event for exploring the intersection of AI, DevOps, and modern software practices. This full-day conference offers a curated agenda featuring industry leaders and hands-on insights into platform engineering, developer productivity, and AI-driven software development. Attendees will have the opportunity to network with professionals from leading enterprises and gain practical knowledge to future-proof their teams and workflows. 

Software Crafters Barcelona 

• October 24-25, 2025
• Barcelona, Spain
• https://dev.events/conferences/software-crafters-barcelona
  

Software Crafters Barcelona is a two-day community-driven event celebrating the art of software craftsmanship. The conference kicks off on Friday evening with an Open Space session, allowing attendees to propose and vote on topics for discussion. Saturday features a full day of diverse sessions, lightning talks, and hands-on coding dojos. The event fosters a collaborative environment where participants can share knowledge, learn from peers, and engage in meaningful conversations. 

Frontend

React Alicante 2025

• October 02-04, 2025
• Alicante, Spain / Online
• https://reactalicante.es/
  

React Alicante is an international conference dedicated to React and React Native, held in one of Europe’s sunniest cities. The event features 32 talks from international speakers, covering topics such as frontend software architectures, design systems, and cross-platform development. Additionally, there are 10 workshops designed to enhance your skills in React and React Native. Tickets are available for both in-person and remote participation.

WarsawJS Meetup #131 – onsite

• October 08, 2025
• Warsaw, Poland 
• https://crossweb.pl/en/events/warsawjs-meetup-131-onsite/
  

Join the WarsawJS community for an evening of JavaScript insights and networking at Meetup #131. Held at Brain Embassy, this event features:
Alexander Dolgov -,,Turning Models into Extensible Platforms with JS”. Explore how JavaScript can transform AI models into modular platforms through plugin architectures.
Keanu Harrell – ,,How to Build Serious Infra Without Losing Your Sanity”. Learn strategies for building robust infrastructure using SST.dev, focusing on maintainability and developer experience.
Kuba Pawłot – Un-Box-ing: Issues with Polymorphic React Components
A lightning talk addressing challenges in designing flexible React components.

meet.js #Poznań #10.2025 #61

• October 14, 2025
• Poznań, Poland 
• https://crossweb.pl/en/events/meet-js-poznan-10-2025-61/
  

Join the Poznań meet.js community for an evening focused on practical challenges in software development. Held at VML’s office in Nowy Rynek, this meetup features two insightful talks:
Adrian Romański – Accessibility driven development, learn how neglecting accessibility early in a project can lead to technical debt and reduced UX quality.
Tomek Sochacki – Managing without manual testers, discover strategies for teams lacking dedicated manual testers. 

The event begins at 18:00 with a 30-minute networking session, followed by presentations and a brief Q&A. Seats are limited, so secure your spot soon.

International JavaScript Conference

• October 27-31, 2025
• Munich, Germany / Online
• https://javascript-conference.com/munich/
  

The International JavaScript Conference is a five-day hybrid event for developers, architects, and tech enthusiasts to explore the latest in JavaScript and related technologies. The program includes workshops, keynotes, and sessions covering Angular, React, Node.js, web performance, testing and security, DevOps, and generative AI. Attendees can choose from flexible ticket options, enjoy networking opportunities, on-site catering, and receive an official conference certificate. 

Conclusion 

From Kubernetes scaling tips in Rzeszów to functional programming insights in London, this month’s events prove once again that software is a global conversation. Big stages, local meetups, and online spaces all bring their own flavour – and together they keep the community thriving.

Stay curious, stay connected, and let October fuel your next big idea.

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Previous Scalendar Editions

• Scalendar June 2025
• Scalendar July 2025
• Scalendar August 2025
• Scalendar September 2025