Portfolio — Est. MMXVII Santo Domingo, DO
Lewin Villar
00
Available for select consulting & product builds

Lewin Villar

Software Engineer — ERP Consultant
Frappe / ERPNext specialist since 2017
Founder, TZCode S.R.L.

I build fiscal-grade software, full-stack platforms, and AI/LLM systems for the Dominican and LATAM markets — from DGII electronic invoicing to multi-tenant SaaS shipped to production.

0
Years in systems
& software
0
Clients served
at TZCode
0
Countries
reached
0
Team members
directed
0
Repositories
90 original
01 Profile

A founder-engineer who ships production systems — not prototypes — and owns the whole arc from fiscal law to deployment.

Software engineer and ERP consultant with 15+ years in systems administration, building production Frappe/ERPNext systems since 2017. Founder of TZCode S.R.L., an 18-person software and accounting firm serving 43+ clients in 10+ countries, and co-founder of Altivia, a private-label SaaS line built on ERPNext.

I specialize in fiscal-grade software for the Dominican and LATAM markets — DGII e-CF, NCF, ITBIS, ISR, and Ley 32-23 — extended to UAE VAT 201 and Mexico CFDI. Alongside that: commerce and EDI integration, and hands-on AI/LLM engineering, from edge computer-vision to security guardrails for AI agents.

MSc in Cybersecurity, Certified Ethical Hacker (CEH), and Certified Scrum Master — I run product, engineering, fiscal/accounting domain, and go-to-market under one roof.

Founder / Operator Full-Stack Fiscal-Tech AI / LLM DevOps Cybersecurity
02

Ventures I Founded

TZCode S.R.L.
CEO & Founder · 2017 — Present

Software & accounting firm, scaled to 18 staff

Founded and scaled a software and accounting firm to 18 staff and 43+ clients across 10+ countries, delivering Frappe/ERPNext implementations across manufacturing, finance, retail, healthcare, automotive, and cooperative banking. I direct four functions — Development, Marketing, Accounting, Customer Success — plus a proprietary ERP product line and Microsoft NCE / Adobe reseller programs. Built the firm's fiscal-compliance practice and operate all production infrastructure at 98.9% availability.

43+
Clients
10+
Countries
18
Staff
98.9%
Uptime
Altivia
Co-Founder · 2025 — Present

Private-label SaaS on ERPNext

A private-label SaaS line built on ERPNext, starting with condominium and building management — production-proven at a 16-unit property and sold on per-door setup plus monthly subscription pricing. Co-founded with Meysi Chang.

16
Units live
Per-door
Pricing model
ERPNext
Platform
03

Selected Work

Tier 01 — Full Software Builds / production & flagship
01 / SaaS In Production

Glamio / LuxeCuts

Multi-tenant SaaS for salons & barbershops

A production multi-tenant SaaS sold by subscription: online booking, in-shop POS, DGII fiscal receipts (NCF), commissions, inventory, and reporting. A ~5,400-line FastAPI service over async MongoDB, a React 19 client, a self-hosted WhatsApp gateway (Evolution API / Baileys on Postgres), and Alanube e-invoicing — Dockerized behind nginx and Let's Encrypt on a self-managed VPS.

FastAPIPython 3.11MongoDB 7 React 19TailwindDocker Compose Evolution APIAlanube e-CF
glamio.do luxecuts
02 / Mobile · CV Pre-launch

DomiNotes

Cross-platform domino app + AI tile scanner

A mobile scorekeeping app with a camera scanner that counts domino pips via computer vision — a deployed Cloudflare Worker calling Gemini 2.5 Flash and a self-hosted Ollama vision model. Firebase auth/Firestore, offline SQLite, AdMob with UMP consent, a Jest suite, and EAS native builds for iOS and Android.

React NativeExpo 54TypeScript FirebaseCloudflare WorkersGemini 2.5 OllamaAdMob
com.dominotes.app
03 / ERP · EDI Delivered

Manufacturing ERP & EDI

Hampden — Frappe/ERPNext + Magento/OpenMage

A full ERPNext implementation: design orders and panels, tray barcode tracking, production monitoring, and automated journal entries posting labor, overhead, fabrication, and cutting-loss variances. On top: an EDI layer with an ETL Setup Screen mapping trading-partner item codes to internal items, file ingestion that generates customer POs, and row-level validation logs.

PythonJavaScriptFrappe/ERPNext Magento / OpenMageEDI / ETL
04 / Fiscal Multi-country

Fiscal Compliance Suite

Tax localization — DR, UAE, MX, PY

Dominican e-CF invoicing via Alanube (webhook authentication, XML validation) and DGII reports 606/607/608 — extended to UAE VAT 201 with drill-down, Mexico CFDI, and Paraguay tax defaults. The compliance backbone reused across products and clients.

PythonFrappe/ERPNextAlanube API XMLDGII 606/607/608VAT 201 / CFDI
05 / Commerce Delivered

Multi-Channel Commerce

ERPNext to 5 marketplaces + carriers

Bidirectional sync of catalogs, orders, inventory, pricing, and fulfillment between ERPNext and five marketplaces — Amazon SP-API, eBay, Shopify, Walmart, WooCommerce — with UPS, USPS, and FedEx integration for label generation and tracking.

Amazon SP-APIeBayShopify WalmartWooCommerceUPS/USPS/FedEx
06 / Web · Portal Shipped

Cooperativa Dinámica

Next.js platform — portal, admin, Puck builder

A savings & credit cooperative's web platform: a member portal with loan and affiliation flows (zod-validated), an admin console, a blog with dynamic routes, product pages, and a Puck-based visual page builder. The most feature-complete of the Next.js sites.

Next.js 16React 19Tailwind v4 Puckreact-hook-form + zodGSAP
07 / Web Shipped

ASICORP Fintech Site

Corporate site — health-sector factoring

A corporate-fintech marketing site for a health-sector factoring firm ("liquidez inmediata para el sector salud"): multi-page, with GSAP scroll animation and Lenis smooth-scroll, an evaluation/lead form, and a Bricolage Grotesque brand system. Domain asicorprd.com.

Next.js 16React 19TypeScript Tailwind v4GSAPLenis
asicorprd.com
08 / AI · Automation Working

Job-Apply Bot

LLM-assisted application pipeline

A TypeScript pipeline that ingests Gmail job alerts, tracks them in a Google Sheet, drafts tailored cover letters with the Anthropic SDK, and pre-fills ATS forms (Greenhouse / Lever / Ashby) via Playwright. Dry-run by default, with login/CAPTCHA pages flagged for review.

Node.jsTypeScriptAnthropic SDK PlaywrightGmail / Sheets API
Tier 02 — Developer Tools, Plugins & Open Source / tooling
SecurityMIT · v2.0

claude-mcp-sentinel

Security guardrail for AI agents

A real-time PreToolUse hook that blocks credential exfiltration, known-bad domains, reverse shells, and remote-script-to-shell installs in AI coding agents — 30–80 ms per call, zero LLM cost. Ships a static scanner with vuln-DB checks, source-integrity verification, and update diffing.

Python 3.8+Claude Code hooksOpen Source
Pluginv0.2

Frappe-ERPNext-Toolkit

Claude Code plugin for safe ERP dev

A local-first per-bench index that answers "does this feature exist?" in under a second; detects prod, staging, and dev environments and refuses destructive operations in production. Ships DR-fiscal-aware skills, a core-protection hook, and a research subagent.

PythonClaude Code pluginShell hooks
GitHub
AI PrototypePrototype

match-live

AI live-match commentator

A live-match companion web app with a Spanish-language football commentator ("Tri-IA") that drives the Claude CLI — with live web search — as a zero-API-key inference backend behind a lightweight Node HTTP server.

Node.jsClaude CLIWebSearch
Tier 03 — Static & Data-Driven Sites / craft
LandingComplete

RADES

Diagnostic radiology center

A premium marketing page for a diagnostic radiology center in Santo Domingo Este — 3D/4D sonography, mammography, densitometry, tomography — with a hand-built inline design system, grain overlay, and full SEO.

HTML/CSS/JSDesign systemSEO
DashboardComplete

ASICORP Cobros

Accounts-receivable dashboard

A single-page collections dashboard ("Estado de Cuenta") driven from a local dataset of receivable records — NCF, concepto, facturado / pagado / pendiente — with sortable tables and invoiced / uninvoiced tabs.

Vanilla JSData-drivenTables
InteractiveComplete

Interactive Reveal

Animated one-off · front-end polish

A personal animated reveal page — layered transitions, glassmorphism, and confetti — a study in front-end animation polish built as a self-contained artifact.

HTML/CSS/JSAnimationGlassmorphism
Tier 04 — Business & Consulting Deliverables / domain expertise
AnalyticsBoard-level

TZCode Audit

Financial audit & strategic diagnosis

A full financial audit and strategic diagnosis built directly from live ERP data — 16,820 GL entries, 672 sales invoices, FY2021 to FY2026 — delivered as a board-level report plus a multi-page HTML dashboard with a "10x" roadmap.

ERPNext dataFinancial analysisDashboard
ProductProven

Altivia Bundle

Condo-management SaaS collateral

Product and proposal collateral for the Altivia condominium-management SaaS — proposal templates, a client proposal (HTML + PDF), and an ERPNext print format. Production-proven at a 16-unit tower on per-door pricing.

ERPNextProposal designPrint formats
SalesDelivered

Lynest Proposal

E-invoicing sales proposal

A client sales proposal for DGII electronic invoicing and Ley 32-23 compliance — a self-contained animated HTML deliverable with a rendered PDF, showing the go-to-market side of the fiscal-tech practice.

Animated HTMLLey 32-23DGII e-CF
Also built
Foxy Bot — MetaTrader 5 algorithmic trading Marchante — Flutter / Firebase Rockwood Kitchens — ERP customization TZDealer Bancosecha SWAT Import — automotive dealership app (12+ yrs live) Clinical & laboratory systems

115 repositories. 90 original.

Everything from ERP apps to AI tooling, in the open.

Browse GitHub
04

Career Trajectory

2017 — PresentSanto Domingo, DO
CEO & Founder
TZCode S.R.L.

Founded and scaled a software and accounting firm to 18 staff and 43+ clients across 10+ countries. Built the fiscal-compliance practice (DGII e-CF, NCF, ITBIS, ISR, Ley 32-23; extended to UAE VAT 201 and Mexico CFDI), engineered multi-channel commerce and B2B EDI pipelines, and operate all production infrastructure at 98.9% availability.

2025 — PresentSanto Domingo, DO
Co-Founder
Altivia

Private-label SaaS on ERPNext, starting with condominium and building management — production-proven at a 16-unit property, sold on per-door setup plus monthly subscription.

2018 — PresentSanto Domingo, DO
Chief Information Officer
Heladom · Baskin-Robbins Franchise

Own technology strategy and operations for a multi-location retail franchise at 99.5%+ uptime — administering mixed Windows / Linux / macOS environments and datacenter services (Active Directory, DHCP, DNS, WDS, VPN), and directing software selection and vendor management.

2021 — 2022Munich, Germany
Senior Developer
Noventive

Led development and delivery of production software through rigorous unit testing and CI/CD, reducing release defects and shortening deployment cycles. Served concurrently as Quality Analyst and Senior Consultant, establishing testing standards and advising clients on architecture.

2014 — PresentSanto Domingo, DO
Webmaster
SWAT Import

Administer the server and web application running all internal operations for an automotive dealership — inventory, sales, and a loan module with automated interest and repayment scheduling — in continuous production for 12+ years.

2010 — 2018Earlier
Advisory & IT Support
Great Health Works · Xerox / Boost Mobile / Sprint

Performance Advisor supervising and developing hundreds of bilingual (EN/ES) new hires; earlier, Senior IT Support across help desk, server, and network administration.

05

Capabilities

ERP / since 2017

Frappe / ERPNext v11–v15Custom apps & doctypesScript Reports WorkflowsHooksFixturesJinja print formats POSMulti-company & multi-currencyVersion migrations

Languages

PythonTypeScriptJavaScriptPHPDart SQLHTML / CSS

Frontend & Mobile

Next.js 16 (App Router)React 19Tailwind CSS v4 shadcn/ui & RadixGSAPPuckReact Native Expo (Router, EAS)Flutter

Backend & Data

FastAPIPydanticFrappeNode.js MongoDB (Motor)MariaDB / MySQLPostgreSQLRedisPrisma

AI / LLM & Security

Anthropic SDKClaude Code pluginsHooks & subagents MCP serversGemini visionLocal inference (Ollama) Computer visionPenetration testingSystem hardeningAI agent guardrails

Integrations

Amazon SP-APIeBayShopifyWalmartWooCommerce Magento / OpenMageStedi EDIUPS / USPS / FedEx Alanube e-CFFirebaseAdMobPlaywright Gmail & Sheets APIsWhatsApp (Evolution API)

Infrastructure

Docker ComposenginxcertbotCloudflare Workers DigitalOceanProxmox VETailscaleWireGuard CI/CDLinuxWindows ServermacOS Active DirectoryDNS · DHCP · VPN

Domain

DGII e-CF / NCFITBIS & ISRLey 32-23UAE VAT 201 Mexico CFDIAccountingFactoringCooperative finance
06

Education & Credentials

MSc, Cybersecurity & Ethical Hacking
CEUPE — Spain
Sept 2021
BSc, Computer Science
Universidad Autónoma de Santo Domingo (UASD)
Aug 2018
Summa Cum Laude
Certification
Certified Ethical Hacker
Certification
Certified Scrum Master
Language
Spanish — Native
Language
English — Fluent
Let's build something

Start a conversation

Available for select consulting engagements and product builds — fiscal-tech, ERP, full-stack, and AI/LLM systems.

lewin.villar@gmail.com