Vykstant

Vykstant is an open-source middleware platform focused on event-driven architectures. It aims to simplify the development of distributed, asynchronous applications by providing a shared runtime for events, commands, and reads across bounded contexts. The project emphasizes modularity, extensibility, and a clear separation between domain logic and infrastructure.

At its core, Vykstant uses a microkernel-like architecture with pluggable adapters. The runtime includes an event bus for streaming events, a command bus for actions, a projection layer for read models, and a saga manager for long-running processes. Persistence supports event sourcing with an append-only event log, and state is reconstructed via projections. The platform can connect to various messaging backends and storage engines through adapters, enabling deployment on-premises or in the cloud.

Key features include CQRS support, schema versioning, fault tolerance through retries and circuit breakers, and observability hooks such as structured logging and metrics. It provides a domain-specific language for describing domain events, commands, and projections, and ships with example projections and sample services to help developers start quickly.

Vykstant is maintained by a community-driven team and released under an open-source license. The project publishes regular releases and maintains public issue trackers, contributor guidelines, and documentation.

Adoption has been reported in pilot projects across sectors with complex domain models. Critics note the learning curve and the operational complexity of event-sourced systems, which Vykstant seeks to mitigate through tooling, conventions, and comprehensive monitoring.

See also: event-driven architecture, event sourcing, CQRS, microservices.