Cyrus David PasteleroSoftware engineer, Singapore

What I cannot build, I do not understand.

I ship a lot, and I can explain all of it. 19 projects written up here, 10 of them live. Some I built twice to find out what actually mattered. Currently trying to survive in Singapore.

Fun fact: I grew up playing Minecraft, which taught me that even the most complex structures start with a single block.

fig. 1, me in 300 pixels

things I built

all projects

On-Device AI

Isip

An iOS app that turns your completed tasks, voice notes, and photos into journal entries automatically using Apple Intelligence. Runs entirely offline and needs no account.

SwiftUI / Foundation Models / SwiftData

Read the write-up

rules I work by

all principles

Start simple. Gall's Law: the complex systems that work grew out of simple ones that worked.
Write it down. ADRs, RFCs and docs force clarity and let knowledge outlive you.
AI drafts, I decide. Read every line and own what ships.

talks

all talks

Airwallex Agentic Finance LabThe first hands-on AgentOS demoFounders, finance leaders and investors ran finance workflows end to end on practice accounts, each in their own sandbox: contract to billing, checking new payees, a card for a contractor, payments and cash, and moving from another provider. Co-facilitated with Gladys Yuen and Sam Waldo.Nov 13, 2026
AWS Community Day Cebu 2025₱0 to MVP: AWS Free-Tier Startup Hacks for Students & ProsI spoke at AWS Community Day Cebu, themed Build Beyond Limits, at the University of the Philippines Cebu Performing Arts Hall. The session was about using the AWS Free Tier and serverless to start small, test ideas quickly and iterate toward an MVP.Sep 13, 2025