App Design Blogs

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Greg Heo
1/25/2026 • EN

Greg Heo

Greg Heo is a software engineer at Apple and former iOS engineer at Instagram. He writes about Swift, iOS development, and photography, blending technical depth with a strong design and creativity focus.

Cassidy Williams
11/29/2025 • EN

Cassidy Williams

Cassidoo.co is the personal blog of Cassidy Williams, a well known developer, speaker, and educator who writes about JavaScript, React, career growth, web development, dev tools, and learning in public. Her posts mix technical insights with approachable explanations, covering topics like UI patterns, coding tips, productivity workflows, and the human side of software engineering. Cassidy is known for her weekly newsletter, open-source work, and community involvement.