Rebuilt the company’s core learning application from the ground up for the web — the learner-facing interface and the authoring/publishing backend that powers it — and provided the backend APIs consumed by the mobile apps. This is my deepest body of work (roughly 6–8 years across the product). (Full four-part write-up to follow via interview — the decisions here, around content modelling, authoring workflows, and serving multiple client types, are worth the depth.)