Product Engineer (UI / Frontend)

ABOUT THE ROLE

Maincode is building the next version of Matilda, the first large language model built and trained from scratch in Australia. We are now scaling the model and deploying it as a live production system.

To do that, we build AI systems from first principles. We design the architectures, run the infrastructure, shape the training process, and operate the systems that serve our models.

Matilda is a production system, not a research prototype, built to be deployed and served for open public access. If the training stack is how Matilda learns, the product is how people experience it. This role sits directly in that layer.

You will help build the user-facing experience of Matilda. Not just how it is implemented, but how it feels, behaves, and communicates with users. You will contribute to designing and building the interfaces that turn a model into a coherent product.

This is not a pure handoff role. You will work closely on both the UX and the implementation, shaping interactions and details directly in code.

WHAT YOU WOULD ACTUALLY DO

You will contribute to the product surface of Matilda’s public interface and internal tools. This includes:

- Building the core web interface for interacting with Matilda (chat, sessions, history, settings)

- Implementing fast, reliable streaming UX for model outputs (real-time tokens, partial responses, cancellation, retries)

- Contributing to interaction design across common and edge-case flows (latency, uncertainty, refusals, errors)

- Helping design UI workflows that support safe and responsible use (reporting, feedback, content handling)

- Iterating on layout, typography, spacing, and interaction details directly in code

- Improving perceived performance and responsiveness through thoughtful UI decisions

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- Building internal tools and dashboards with a strong focus on clarity and usability

- Working closely with backend and infra engineers to integrate APIs, auth, and system constraints

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