Cedrick Castro

Cooking up software since 2019

I build product systems for money movement.

Hello 👋, I'm Cedrick, a Senior Product Engineer at NextPay in Manila. I turn high-trust workflows into APIs, tools, and product surfaces people can operate with confidence.

Proof of trust

The promise is reliability under pressure; the proof is scale.

Operating scale

30K+ transactions / month
PHP 500M+ GTV / month
Reliable product systems at real operating scale.

I build products where reliability, clarity, and day-to-day usability matter.

Choose where to look.

A short path through the work, the proof, and what I am exploring next.

Work with real constraints.

Pick a chapter to see the work, the scale, and the judgment behind it.

NextPay

Money movement products at operating scale.

I work on the partner and operations surfaces behind collections, payouts, provider integrations, reconciliation, and live financial workflows.

30K+ transactions processed monthly
PHP 500M+ gross transaction value monthly
  • Partner-facing APIs for collections, payouts, and reconciliation
  • Provider integrations across bank, QRPH, card, payout, and backoffice flows
  • Payment safety work around idempotency, ownership checks, status transitions, and webhook settlement
View NextPay work

Visible anchors

A few shipped artifacts with story notes behind them.

api / fintech

NextPay API

Shipped partner primitives for collections, payouts, and money movement integrations.

Story

ops / tool

Treasury and QA Tools

Shipped operator surfaces for safer financial workflows.

Story

creator / product

Boozt Studio

Shipped creator operations surfaces for monetization and studio workflows.

Story

How the work gets built

A compact read on the stack behind the APIs, operations tools, and money movement systems.

API contracts

Typed public surfaces for partner integrations and money movement flows.

  • TypeScript
  • Hono
  • OpenAPI
  • Zod

Async runtime

Deployable services, scheduled work, durable coordination, and provider-facing background jobs.

  • Workers
  • Workflows
  • Durable Objects
  • Queues
  • Trigger.dev
  • Wrangler

Money data

Schema-owned persistence for payments, reconciliation, auth, and operational reporting.

  • Postgres
  • Drizzle
  • Kysely
  • Formance

Product surfaces

Dense operator screens, docs apps, internal tools, and workflow-heavy interfaces.

  • React
  • Next.js
  • TanStack
  • Remix
  • Tailwind

Build loop

Fast local checks, package boundaries, deploy scripts, and repeatable repo maintenance.

  • Bun
  • Turbo
  • Biome
  • EffectTS

Building something hard? Let's talk.

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