Scalendar May 2025 

Event-driven Newsletter

May 2025 is already in full swing, and so is this month’s Scalendar – your curated guide to the best upcoming Scala, frontend, and software architecture events. From deep dives into Scala build tools and cross-language problem solving, to next-gen frontend frameworks and leadership masterclasses, May brings a packed lineup of technical insights and networking opportunities. Whether you’re sharpening your functional programming chops, modernizing your frontend stack, or refining your architecture skills, there’s something ahead to keep your skills sharp and your curiosity fueled.

Ready to learn, build, and connect? Let’s make May a month of real growth – jump into the lineup below.

Scala conferences May 2025

Functional World #17 | Let’s Teach LLMs to Write Great Scala!

• May 28, 2025
• Online
• https://www.meetup.com/functionalworld

In this talk, Kannupriya Kalra, Scala Center mentor and co-creator of LLM4S, demonstrates how Scala’s strong types and functional patterns enable safer and more scalable AI development. You’ll learn how concepts like agentic workflows and tool calling apply in a typed language -and why LLM4S is building a Scala-first toolkit to rival LangChain and co. If you’re curious about LLMs, Scala’s role in AI, or contributing to open-source in this space, this one’s for you.

The Atlanta Scala Meetup Group

• May 7, 2025
• Online
• https://www.meetup.com/atlanta-scala/events

Join the Atlanta Scala community for their bi-monthly virtual meetup. This informal online gathering welcomes Scala developers of all levels to share insights, exchange ideas, and delve into topics such as functional programming, distributed systems, and Akka. Whether you’re looking to learn, present, or just listen in, this is a great space to connect with fellow Scala enthusiasts and stay engaged with the community.

Scala-Pils

• May 7, 2025
• Oslo, Norway 
• https://www.meetup.com/scalabin/events

Relax, code, and connect at Scala-Pils in Oslo on May 7. Hosted at Nedre Foss Gård, this informal meetup invites Scala enthusiasts to gather over drinks and dive into open discussions about functional programming, new projects, and tech trends. No agenda – just a friendly space to share ideas and meet the local community.

ScalaMAD: Scala Programming @Madrid

• May 7, 2025
• Madrid, Spain 
• https://www.meetup.com/scala-programming-madrid/events

Explore how different programming languages approach the same challenge at Scala Programming Madrid’s special meetup on. Seven developers will each solve a Roman numeral conversion problem using a different language, from Scala to Rust. It’s a unique look at how syntax, paradigms, and mindset shape software design, perfect for developers curious about cross-language thinking.
This event will be conducted in Spanish. 

London Scala User Group | London & Krakow Scala Talks

• May 14, 2025
• London, UK
• https://www.meetup.com/london-scala/events

London Scala User Group teams up with Kraków for a special meetup packed with deep tech insights.  Volodymyr Yaroslavskyi will tackle code complexity in his talk “Complexity is a Sin” while a mystery speaker from Kraków will dive into innovative uses of Metals and LLMs via Model Context Protocol. A perfect evening for those passionate about writing cleaner, smarter Scala code

Scala Stockholm | Scala Spring Meetup

• May 15, 2025
• Stockholm, Sweden
• https://www.meetup.com/scala-stockholm

Scala Stockholm’s Spring Meetup returns on May 15, 2025, hosted at Truecaller’s Stockholm office. The agenda features two technical talks, with the first presented by Edvin Lundberg. The second speaker is yet to be announced. This event is ideal for Scala developers interested in functional programming and JVM languages.  

ScalaMAD: Scala Programming @Madrid | Better Scala Builds with the Mill Build Tool

• May 20, 2025
• Madrid, Spain
• https://www.meetup.com/scala-programming-madrid

Join Scala Programming Madrid for a deep dive into the Mill build tool with Li Haoyi. This live-coding session will demonstrate how Mill outperforms SBT in terms of simplicity, performance, and scalability, providing a cleaner and faster way to manage Scala builds. A must-attend event for developers looking to level up their build tool game.

Amsterdam.scala | Talks and drinks with Adam Warski

• May 21, 2025
• Amsterdam, Netherlands 
• https://www.meetup.com/amsterdam-scala

Join Amsterdam.scala for two technical deep dives. Adam Warski will explore how Java’s Virtual Threads challenge Reactive Streams and what it means for Scala developers. Kimberley Huizing will introduce ZIO, demonstrating how modern effectful programming transforms Scala applications. Hosted at Xebia, this evening mixes sharp talks with drinks and relaxed networking.

Dallas Scala Enthusiasts 

• May 23, 2025
• Online 
• https://www.meetup.com/dallas-scala-enthusiasts

Scala enthusiasts gather online with Dallas Scala Enthusiasts for an open discussion and social meetup. Bring your Scala questions, suggest topics, or even give a short presentation – developers of all experience levels are encouraged to participate.  Whether you’re new to Scala or a seasoned dev, it’s a welcoming space to ask, learn, and chat.

Software Architecture 

Modern Software Engineering with TTD

• May 8-9, 2025
• Online
• https://tdd.engineering/

Ready to refine your coding standards? Daniel Moka, founder of the TDD Manifesto, leads a deep, practical dive into Test-Driven Development for .NET developers. Throughout this certification course, you’ll sharpen your ability to create maintainable, well-tested software, applying Test-Driven Development (TDD) to real-world scenarios across various industries, including healthcare and blockchain. A serious boost for any dev aiming for technical excellence.

Clean Architecture 

• May 12-15, 2025
• Online 
• https://clean.re/

Learn how to deliver maintainable software at speed in Daniel Moka’s Modern Software Engineering with TDD course. Through labs and real-world exercises, you’ll master the Red-Green-Refactor cycle, advanced testing techniques, and pragmatic architecture patterns. Ideal for .NET developers seeking to integrate technical excellence into every stage of the development lifecycle.

The Principal Dev

• May 22-23, 2025
• Online
• https://principal.dev/

Level up your leadership skills with The Principal Dev masterclass. In two packed days, experienced engineers will learn how to lead teams, balance technical and soft skills, optimize development processes, and design effective hiring strategies. Expect practical frameworks, leadership tactics, and certification to boost your impact as a technical leader.

Frontend

meet.js KRK [with Schibsted]

• May 8, 2025
• Cracow, Poland
• https://crossweb.pl/en/events/meet-js-krk-with-schibsted-maj-2025/

Kraków’s JavaScript community gathers on May 8 for meet.js KRK, hosted by Schibsted. Talks include Karol Majta’s deep dive into JSCad for makers and Konrad Bujak’s live walkthrough of a full-stack GenAI prototyping setup. Whether you’re into frontend, backend, or AI, this meetup promises sharp insights – plus pizza, beer, and a relaxed vibe.

Middlesbrough Front End

• May 12, 2025
• Middlesbrough, UK
• https://www.middlesbroughfe.co.uk/events/conferences/2025

Middlesbrough Front End Conference returns on June 12 at Riverside Stadium, bringing top front-end experts together for a day of cutting-edge talks. Expect sessions on View Transitions with Bramus Van Damme, 3D web with React Three Fiber by Sara Vieira, sustainable web funding with Stephanie Stimac, and legacy CSS modernization with Ana Rodrigues. A must for developers looking to shape the web’s next evolution.

WarsawJS Meetup

• May 14, 2025
• Warsaw, Poland 
• https://crossweb.pl/en/events/warsawjs-meetup-126-onsite/

WarsawJS Meetup #126 kicks off on May 14 at Paramount in Warsaw. Expect sharp talks covering Angular monetization, modular frontend architecture, AI-driven web app rebuilding, and agile transformations. Speakers include Daniil Rabizo, Tomasz Ducin, Mariusz Kaczkowski, and Krzysztof Chojnacki, with Mikhail Korolev serving as the host. Code, chat, and connect with the vibrant JavaScript community.

CityJS Athens 

• May 27-31, 2025
• Athens, Greece 
• https://athens.cityjsconf.org/

CityJS Athens 2025 will take over the Serafio Community Center from May 28 to 31, featuring four packed days of workshops, a meetup, and a two-day JavaScript conference. Expect sessions on a wide range of topics, including React Server Actions, Playwright frameworks, AI agents, and memory management. Join developers from around the world for hands-on learning and real-world tech insights.

App.js Conference 2025

• May 28-30, 2025
• Cracow, Poland 
• https://appjs.co/

From May 28 to 30, Kraków becomes the center of the React Native world at App.js Conf 2025. With talks from developers at Meta, SpaceX, Amazon, and Software Mansion, plus deep-dive workshops (already sold out), the event covers everything from animation mastery to cross-platform app design and cutting-edge mobile performance.

Conclusion

As May brings longer days and fresh energy, it’s the perfect time to invest in your growth as a developer. These Scala meetups, frontend conferences, and software architecture workshops offer not just technical knowledge but real opportunities to connect with like-minded professionals.
The tech world isn’t slowing down, and neither should you. So stay curious, stay sharp, and keep pushing forward!

Explore new career opportunities

Ready for your next professional challenge? Discover the latest job openings at Scalac!

• Senior Scala Developer
• Senior Developer Experience Engineer
• Senior Rust Engineer

Or apply to Scala Talent Pool – send your CV, and we’ll contact you whenever a project matching your skill set comes up!

Previous Scalendar Editions

• Scalendar December 2024
• Scalendar January 2025
• Scalendar February 2025
• Scalendar March 2025
• Scalendar April 2025