Mozaik Hackathon 2026: Build Concurrent Multi-Agent Systems and Compete for $1,000 in Cash Prizes

Building a multi-agent system sounds simple on a whiteboard. Give one agent a task, let another handle the next step, add a reviewer, connect a few tools, and you have an agentic workflow. It gets more complicated when those agents need to operate at the same time. A sequential workflow can force agents into a fixed order: one finishes, another starts, and everyone downstream waits. That model is easy to reason about, but it can become restrictive as the system grows and agents need to react to new information independently. Mozaik takes a different architectural approach. It is an open-source TypeScript framework for building reactive agents inside an event-driven environment, where agents can work concurrently, respond to events, and coordinate without requiring a central workflow to define every interaction. And now there is a practical way to try this architecture. JigJoy , together with daily.dev and Hyperskill , is organizing the Mozaik Hackathon 2026 , a free online hackathon focused on building concurrent AI agents. TL;DR Building more agents doesn't automatically make a multi-agent system better. The way those agents communicate, react, and depend on one another can have a bigger impact on how the system behaves as it grows. Mozaik approaches this problem with an event-driven architecture designed around reactive, non-blocking agents. Agents join a shared AgenticEnvironment , receive events, and decide how to react to them. Here’s what makes the Mozaik Hackathon 2026 worth a look: Concurrent AI agents: Multiple agents can work at the same time and react to events as they arrive. Event-driven architecture: Agents, humans, observers, and tools participate in the same AgenticEnvironment . Non-blocking execution: Inference and message delivery can continue in the background without holding up other participants. Loosely coupled agents: Agents can operate more independently, making them easier to reuse across projects and applications. TypeScript-based: Mozaik i