Writing — TY Koh

Writing

Essays & reflections

On architecture, leadership, systems, and the occasional endurance metaphor. Written when there's something worth saying.

24 February 2026

14 min read

Designing Trust on Mobile: Attestation, Step-Up, and the Architecture of Protected Actions

In mobile security, trust is rarely a single control. It is assembled through layers: device integrity, user authentication, cryptographic proof, and server-side verification.

Mobile Security Architecture Fintech

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21 May 2025

10 min read

Beyond Comfort Zones: Why Endurance Challenges Change How We Solve Problems

Endurance events are often described in physical terms. In reality, they reshape how we approach difficulty, uncertainty, and persistence — lessons that extend far beyond sport.

Endurance Leadership Reflection

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