> hello, world_

Cyrus David Pastelero

Software Engineer • building things that matter

I turn late nights and rabbit holes into products people actually use. Currently obsessed with AI, scalable systems, and making complex things feel simple. Based in Singapore.

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

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Featured Projects

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Isip

iOS App

The journal that writes itself. Complete tasks, speak thoughts, snap photos, and on-device AI turns it into a journal entry. 100% offline, no account.

iOS · Swift · Apple Intelligence · SwiftUI

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Claude Mission Control

Open Source

Real-time command center for Claude Code agents. Monitor every agent from one dashboard, send instructions, track costs, and catch stuck loops from your phone.

TypeScript · WebSocket · SQLite · Claude Code

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Sentinel Feed

AI Radar

AI-curated tech intelligence radar. Aggregates 7 sources every 15 minutes, flags critical security stories, and renders them as a radar, map, or list.

Next.js 16 · TypeScript · Claude Haiku · Vercel

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JustCar

49K+ vehicles

Smart car comparison platform with 49,000+ vehicles across 219 brands. Side-by-side comparison across 50+ specifications.

Next.js · TypeScript · Supabase · Tailwind

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Arkitekto

7K+ questions

Online review platform for the Philippine Architect Licensure Exam with 7,000+ practice questions, mock exams, and spaced repetition.

Next.js · Supabase · Tailwind · React 19

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Hanyu

Mobile App

Chinese language learning app with stroke-order writing practice, tone training, and smart spaced repetition.

iOS · Swift · Language Learning

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Technologies

TypeScriptReactNext.jsNode.jsPostgreSQLAWSSupabaseTailwind CSSSwift

Writing

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Technical deep-dives, system design, and what building real products actually taught me.

I Open Sourced My Personal Operating System

April 1, 2026

Why I turned years of notes on focus, fitness, career, engineering, and mindset into a structured public knowledge base. And what writing it all down forced me to confront about how I actually operate.

I Built My Brother a Portfolio with a Custom CRM — In a Weekend

March 30, 2026

A freelance portfolio used to mean a Behance page and a Google Sheet for tracking clients. I built my brother a full platform with a 6-stage lead tracker, contract generator, and rate calculator — all client-side, no backend. Here is why branding and tooling are the real moats in the age of AI.

I Built a Board Exam Reviewer for Filipino Architects

February 9, 2026

How I went from "there should be a better way to study" to shipping a platform with 8,000+ practice questions, spaced repetition, and mock exams for the Philippine Architect Licensure Examination.

About

I'm a software engineer who believes the best code is the code you don't have to write. My philosophy: "What I cannot build, I do not understand."

When I'm not shipping features at 2am, you'll find me chasing a new hobby — currently hiking, previously Muay Thai, cycling, and running. I'm the type who dives deep into something, then moves on to the next obsession. Still think Minecraft is one of the best games ever made.

Years Coding

20+

Ships Shipped

∞

Hobbies Tried

psst... hit the music button for some nostalgia