Scalendar September 2025

Event-driven Newsletter

We’re back from Scala Days – recharged, inspired, and definitely not slowing down. While this month’s Scalendar is a bit lighter on Scala events, the Software Architecture and Frontend events deliver plenty of technical depth to keep your mind busy.
From platform engineering deep-dives to hands-on API design, September keeps the momentum going.

Whether you’re tuning in online or hitting local meetups, there’s plenty here to stretch your thinking and connect with the community.

Scala Days – thank you!

We couldn’t start Scalendar without mentioning Scala Days – an event that keeps inspiring and connecting the Scala community.
A huge thank you to everyone who visited our booth – your conversations and insights mean a lot to us. And, of course, a big thank you to the Scala Days organizers for creating such a fantastic space to share knowledge and experience.

If you couldn’t make it this time, don’t worry!

• Watch our wrap-up video from Scala Days 2025
• Check out our interview series with Scala Days participants – watch the first episode with Darja Jovanovic

Follow us so you don’t miss what’s coming next!

Scala conferences in September 2025

Scala-Pils | scalabin

• September 03, 2025
• Oslo, Norway 
• https://www.meetup.com/scalabin/events

Join scalabin for the monthly Scala-Pils Meetup! A relaxed evening with programming discussions, good beer, and great company. Whether you’re looking to share ideas, learn from fellow developers, or simply enjoy some casual tech talk, this is the place to be. It’s an ideal space to connect, share expertise, and grow your network in the Scala ecosystem.

Scala Discussion and Conversation | Dallas Scala Enthusiasts 

• September 12, 2025
• Online
• https://www.meetup.com/dallas-scala-enthusiasts/events

Join the Dallas Scala Enthusiasts for an informal online gathering focused on Scala programming. This meetup is designed for developers of all skill levels to engage in open discussions, share experiences, and explore topics related to Scala. Whether you’re a seasoned Scala expert or just starting, your insights and questions are welcome.

Software Architecture

API World 2025

• September 3-5, 2025
• California, USA / online
• https://apiworld.co/

API World is an API conference and expo, scheduled for September 3-5 in Santa Clara, CA, with a live‑online extension from September 10-12, 2025.
This high-impact event brings together thousands of developers, architects, and tech executives to explore best practices and future trends at the nexus of APIs, AI, cloud, and data. With over 250 sessions across summits on API design, security, AI integration, ops, business strategy, and partnership, plus hands‑on workshops, a bustling expo, hackathon, awards ceremony, and valuable networking experiences – all driving awareness and enabling meaningful lead capture in the evolving API economy. 

Conf42 Platform Engineering 2025

• September 04, 2025
• online
• https://dev.events/conferences/platform-engineering-2025

Platform Engineering 2025 is a dynamic virtual event featuring a rich lineup of over 120 expert-led sessions across various tracks. From agents, analytics, APIs, architecture, and automation to GenAI, DevEx, infrastructure, security, and more. This curated online conference delivers concise, high-impact insights on AI-driven scalability, resilience, observability, CI/CD optimization, secure multi-tenant systems, and self-healing infrastructure – all shaped to empower platform engineers, DevOps leaders, and architecture teams to drive innovation and elevate the developer experience.

NDC Copenhagen Developers Festival 2025

• September 08-12, 2025
• Copenhagen, Denmark
• https://dev.events/conferences/copenhagen-developers-festival-2025-yoc0th9

Join The Copenhagen Developers Festival 2025 (a.k.a. NDC Copenhagen Developers Festival) for a five‑day hybrid experience in Copenhagen.
It invites software developers and architects to dive into more than 110 sessions and 11 workshops led by over 90 international speakers and artists, blending deep technical learning with creative festival flair. Expect hands‑on workshops, conference tracks, and evening festival-style networking, designed to strengthen community, spark fresh ideas, and generate lasting engagement.

Infobip | Shift Conference 

• September 14-16, 2025
• Zadar, Croatia
• https://shift.infobip.com/

Infobip Shift 2025 is a vibrant three‑day developer conference set amidst the historic charm of Zadar, Croatia.
It convenes a global developer community for immersive, hands-on learning across six stages, featuring inspiring talks, panels, workshops, and startup pitches, alongside a lively expo area and cultural after-parties that spark authentic connections and serendipitous collaboration.
Shift blends deep technical insight with relaxed Mediterranean flair, designed to elevate engagement, fuel networking, and drive meaningful lead opportunities for tech brands.

API Platform Conference 2025

• September 18-19, 2025
• Lille, France / online
• https://api-platform.com/con/2025/

Join the API Platform Conference 2025, marking the 10th anniversary of the API Platform framework, which unfolds over two days in Lille and online.
This hybrid flagship event, featuring sessions in both English and French, brings together leading voices like Symfony creator Fabien Potencier, Laravel Cloud’s Joe Dixon, Packagist co-founder Nils Adermann, PHP core developer Gina Peter Banyard, database expert Tobias Petry, and more, delivering rich technical content across API design, performance, DevOps, FrankenPHP, AI, and PHP ecosystem best practices. With in-depth discussions, seamless digital access, and a vibrant in-person community in a prime European hub, it’s designed to spark API innovation, drive inbound interest, and foster meaningful engagement.

Confitura

• September 19-20, 2025
• Warsaw, Poland
• https://dev.events/conferences/confitura-iyv8xmpk

Confitura 2025, taking place on September 19-20, 2025, at the ADN Conference Center in Warsaw, is one of Poland’s longest‑running and most community‑driven software gatherings. Organised by passionate Java developers, architects, and IT professionals, this inclusive and affordable conference offers a rich program of sessions and workshops, both in Polish and English, covering advanced coding practices, JVM innovations, emerging trends, and generative AI, as well as the concurrent AI & NLP Day.
With a cozy, welcoming atmosphere that bridges local and international talent, Confitura empowers developers at any career stage to learn deeply, network meaningfully, and engage with industry‑defining content.

GOTO Copenhagen 2025

• September 29 – Oct 3, 2025
• Copenhagen, Denmark
• https://dev.events/conferences/goto-copenhagen-2025-ijpm8twh

This hybrid developer conference combines two days of immersive masterclasses, led by industry legends such as Kent Beck, Sam Newman, Dave Farley, Jacqui Read, and Alistair Cockburn, with three full days of high-impact conference sessions and keynotes from thought leaders, including Martin Fowler, Trisha Gee, Sarah Meiklejohn, and others. Packed with rich content across Cloud & DevOps, AI & Data, Architecture, Developer Productivity, Security, Frontend, Teams & Organization, and Tech for Good, the event offers hands-on learning, deep technical insights, and prime opportunities for networking and lead generation in a vibrant, design-forward setting.

Frontend

React Universe Conf

• September 02-04, 2025
• Wroclaw, Poland
• https://www.reactuniverseconf.com/

React Universe Conf 2025 is offering hybrid access for both in-person and online participants, bringing together over 25 speakers and 600 global developers and professionals to explore the frontiers of React and React Native. Featuring immersive workshops, cutting‑edge tech reveals, deep‑dive sessions on full‑stack development, cross‑platform strategies, micro front‑ends, module federation, WebAssembly, React 19 innovations, and more, this conference balances hard technical depth with vibrant community energy, including epic after‑parties and scenic local flair to ignite connections, inspire innovation, and drive meaningful lead capture.

WarsawJS Meetup #130 – onsite

• September 10, 2025
• Warsaw, Poland
• https://crossweb.pl/en/events/warsawjs-meetup-130-onsite/

WarsawJS Meetup #130 – onsite brings together Warsaw’s vibrant JavaScript community on Wednesday, 10 September.
The evening features a compelling mix of expert-led talks, including “How to build a desktop app in ElectronJS with OpenVINO” by Mikołaj Roszczyk, “Beyond REST: Exploring the World of Modern API Protocols” by Kostiantyn Tsymbal, and lightning talks such as “Prompt Compressor” by Oskar Korczak.
Expect hands-on technical depth, lightning-speed insights, and valuable networking with peers. 

WhatTheStack ‘25

• September 20, 2025
• Skopje, Macedonia
• https://dev.events/conferences/what-the-stack-25-kwpagumo

WhatTheStack 2025 returns on September 20, 2025, in Skopje, North Macedonia, as a single‑day, community-centred web development conference staged by developers, for developers.
Set at the iconic MKC venue in the city centre, it features 4 dynamic tracks, more than 30 authentic talks, and draws a crowd of over 500 attendees – all paired with coffee, gourmet Balkan cuisine, beers, and relaxed networking vibes.
This event thrives on its informal, vibrant atmosphere, offering genuine insights from passionate speakers, hands-on pre-conference workshops, memorable after-parties, and inclusive engagement that fuels community, creativity, and meaningful lead connections. 

meet.js | Warsaw x Legends

• September 24, 2025
• Warsaw, Poland 
• https://crossweb.pl/en/events/meet-js-warsaw-x-legends-wrzesien-2025/

Join this meet.js Warsaw x Legends free, community‑driven JavaScript meetup.
The event opens early at 17:00 for casual mingling and snacks, before diving into an energizing program featuring two in-depth talks.
“Learning from my side project mistakes” by Jonathan Fielding and “Accessibility Driven Development” by Adrian Romański, plus lightning talks on communication by John Ostrowski and creative insights with “Radical strawberry arrangement” by Zbyszek Tenerowicz. Attendees also enjoy dynamic “discussion circles,” an open‑mic segment, and a curated JS news roundup, fostering authentic community connection, knowledge exchange, and spontaneous lead opportunities in an informal, tech-savvy setting.

Conclusion

React, APIs, infra, and everything in between – September’s events are a good reminder that strong engineering isn’t just about code, but how systems fit together. Whether you’re leading teams, shaping platforms, or still experimenting, there’s fuel here for your next idea.

Stay sharp, stay social, and keep building. See you in October!

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Previous Scalendar Editions

• Scalendar May 2025
• Scalendar June 2025
• Scalendar July 2025
• Scalendar August 2025