Show HN: Hekla, an event sourcing runtime with its own language

Hekla is a new event sourcing runtime with a purpose-built language, announced on Hacker News. The project, authored by tqwewe, debuted as a Show HN submission on September 11, 2026, aiming to provide a dedicated environment for building systems that rely on event sourcing patterns.

Event sourcing is an architectural approach where an application stores state by logging immutable events rather than persisting current state directly. Hekla appears designed to make this pattern more accessible by offering both a runtime and a language purpose-built for the model, rather than layering event sourcing logic on top of general-purpose languages. The project is publicly available, and the creator has made the work available at hekla.tqwewe.com.

The Show HN format indicates this is an early-stage launch seeking community feedback rather than an established product with existing customers or funding. Event sourcing has seen increased attention in recent years as companies seek auditability, temporal query capability, and replay functionality in their systems—features that emerge naturally from an append-only event log. Specialized tooling in this space has historically come from libraries and frameworks; a dedicated language and runtime represents a different bet on how to embed these patterns into infrastructure.

Hekla joins a landscape of event sourcing frameworks and platforms, though most existing tools operate as libraries within mainstream languages or as databases with event log features layered on top. A purpose-built language and runtime allow the author to make different tradeoffs—potentially prioritizing event-centric semantics over compatibility with existing ecosystems. The specifics of Hekla's design, performance characteristics, and developer experience will likely emerge as the project matures and community feedback arrives.