★ FLAGSHIP — FOUNDER & ENGINEER
NudgeNow
A follow-up CRM for financial advisors in the Philippines — automated cadences, calendar sync, and local payments. Live in production with paying users.
REACTSUPABASEPOSTGRESQLPAYMONGO
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SENIOR PRODUCT ENGINEERING — METRO MANILA
BUILT.
SHIPPED.
Villacrusis Labs is the engineering studio of Harold Villacrusis. Nine years of production fintech and SaaS — every build architected, coded, and shipped by the same senior engineer.
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REACT · NEXT.JS · TYPESCRIPT · SUPABASE · FINTECH & SAAS ENGINEERING · PRODUCT FRONTEND · FULL-STACK MVP · BUILT BY THE ENGINEER YOU HIRED · MANILA → WORLDWIDE
Agencies sell you a team, then route you through account managers and whoever is free this sprint. Here, you brief one senior engineer — and the same engineer architects, builds, and ships. My name is on the work.
Capabilities
Product Frontend Builds
Complete React and Next.js applications — architecture, component systems, auth, testing, CI/CD. Built to be maintained, not just launched.
01Product Frontend Builds
02Full-Stack MVP Builds
03CMS Marketing Sites
04Audit & Rescue
Selected Work
Real products, in production.
SOLE FRONTEND ENGINEER
AU fintech wage-advance platform
One engineer, all three production surfaces of a regulated fintech — the customer app with bank integrations and multi-step KYC, the internal operations portal with embedded analytics and payment processing, and the public website.
REACT 19TYPESCRIPTVITEAWS
LEAD FRONTEND ENGINEER
US financial SaaS platform
Financial management platform for the US events industry — full invoicing lifecycle with OTP-secured public views, Stripe payments (card, ACH, debit) with state-specific fee compliance, and subscription billing with automatic enforcement.
NEXT.JS 15TYPESCRIPTSTRIPEMSAL
LEAD FRONTEND ENGINEER
Multi-region fitness brand
Marketing platform serving four countries from one codebase — CMS-composable pages, region routing, SSG and ISR.
NEXT.JS 16CONTENTFULGRAPHQL
LEAD FRONTEND ENGINEER
Outsourcing marketplace platform
Marketplace matching organizations with vetted providers — a 12-step search wizard, provider dashboards, and lead management.
REACT 19ZUSTANDTANSTACK QUERY
Methodology
How an engagement runs.
01
Scope
A short paid discovery or a straight quote. You get a written plan: what's being built, what it costs, what could go wrong. No vague estimates.
02
Architect
Stack, data model, and delivery plan locked with clear rationale — decisions you won't be re-litigating six months in.
03
Ship
Weekly demos of working software. You watch the product grow in staging — not in slide decks.
04
Support
Post-launch I stay accountable: monitoring, fixes, iteration. The engineer who built it is the one on call.
The Engineer
Harold Villacrusis
Senior product engineer — nine years in React, Next.js, and TypeScript. I've been the sole frontend engineer on production fintech platforms, shipped multi-region sites for global brands, and founded NudgeNow, a CRM live in the Philippine market. Payments shipped on three continents' rails — Australia (Illion, CreditSense), the US (Stripe, ACH), and the Philippines (PayMongo, GCash/Maya). Villacrusis Labs is deliberately a studio of one: you get me, my full attention, and my name on the work.
REACT 19 · NEXT.JS 16 · TYPESCRIPT · TAILWIND CSS · TANSTACK QUERY · ZUSTAND · SUPABASE · POSTGRESQL · GRAPHQL · AWS
9
YEARS ENGINEERING
6
PRODUCTION APPS — LAST 12 MONTHS
4
COUNTRIES SERVED
1
FOUNDER-BUILT PRODUCT LIVE
Start a Project
Tell me what you're building.
Or what's broken. Either way — I reply within one business day.