Frontend Architecture

A frontend used to be a presentation layer: format the data, render the screen. That’s no longer the job. A modern single-page application manages complex UI state, coordinates asynchronous data from a dozen APIs, and runs real business logic in the browser. Without a deliberate architecture, that complexity compounds until the application is slow, fragile, and expensive to change, and every new feature risks breaking something that already worked.

Good architecture is what keeps that complexity in check. The right boundaries let the codebase scale with the team instead of collapsing under it; clear ownership and predictable data flow keep it maintainable as it grows; a shared component system makes the interface reusable rather than rebuilt on every screen; and decisions made deliberately up front keep the product adaptable years later, when the framework, the team, and the requirements have all moved on. Performance comes from the same structure: an architecture that controls what loads and when is fast by design, not by rescue.

We’ve made these decisions where getting them wrong is costly: enterprise-scale platforms for Swiss clients like SBB, whose RedaSys reaches an audience in the millions, and a DataGrid that is the shared foundation behind more than ten healthcare portals. That work runs on React and Next.js, organised as monorepos with domain-driven boundaries, so multiple teams build in parallel without stepping on each other. We start from how the product is actually used, draw clear lines between domains, and modernise legacy frontends incrementally rather than betting the business on a rewrite. The goal is a codebase the next engineer can read, extend, and trust.