Growing from a mid-level to a senior frontend engineer means moving past basic component state and looking closely at architectural trade-offs.
This video is an incredible breakdown of frontend system design for data-heavy applications. It covers a real-world scenario—processing massive local datasets on the client side—and dives deep into the architecture of Web Workers. Rather than just showing the API, it covers the engineering decisions you actually face: managing background memory efficiently, avoiding sending large payloads back and forth, and handling out-of-order responses.
Perfect for anyone looking to level up their systems thinking or preparing for frontend design interviews.
<a href="https://www.youtube.com/watch?v=nw-7ry_hhio&amp;t=769s" target="_blank" rel="noopener nofollow">Check it out: Frontend System Design Essentials: Data-Heavy Frontend Apps</a>

Milad Sadeghi

A deep dive into frontend system design for data-heavy applications, focusing on Web Workers architecture for processing large local datasets on the client side. Covers key engineering decisions including background memory management, avoiding large payload transfers, and handling out-of-order responses. Aimed at mid-to-senior frontend engineers looking to strengthen systems thinking or prepare for frontend design interviews.

Shifting Mindsets: From Building React Components to Frontend System Design