​The official pre-party of reactCon at next.app devCon 2026. Hosted by TesterArmy x Expo

​The night before the doors open, we are taking over a place in west Berlin for food, cold drinks and a few hours of good company. Registered guests get the address by email a few days before.

​No talks, no agenda. One short hello from the hosts, then it is all networking. Come if you are in town for reactCon, if you build in Berlin, or if you simply want to meet the React, React Native and web crowd before the three days that follow.

​Expo and TesterArmy bring the food and the bar.

​What to expect:

• ​Food stations

• ​An open bar, with and without alcohol

• ​Around 100 people, reactCon and next.app devCon attendees first

​When: Tuesday, 6 October, 19:00 to 23:00
Where: TBC, Berlin

​Space is limited, so registrations are approved manually. Grab your spot early.

​About your hosts

​TesterArmy puts agents on your app that test it like real users. Nearly 3,000 teams have put it to work. On every pull request it clicks through your app the way a customer would, catches what broke, and sends back screenshots and recordings you can paste into your coding agent to fix. Plain English in, nothing to script or maintain. Web and mobile.

​Expo is the mobile AI infrastructure to develop, test, deploy, and monitor your app. Build with Expo's CLI, agent Skills, and MCP. Test on cloud simulators made for agents, so an agent can check its own work with screenshots, recordings, and logs. Ship to the App Store and Google Play, then push updates after launch. Monitor crashes, performance, and update adoption in production.

​reactCon is the React and React Native track of next.app devCon 2026, 7 to 9 October at the CityCube Berlin.