🇳🇮 Nicaraguan developer  ·  📍 Tuxtla Gutiérrez, Mexico (UTC−6)  ·  🟢 Available for a full-time role, remote or on-site

_{A quick tour of trinaxcode.com: 12 projects, bilingual (ES/EN), CV, certificates and a 15-minute call booking}

Flagship · MirrorLab · Selected work · Toolbox · Certificates · Contact

I'm Huascar Ignacio D Trinidad Arguello, a self-taught full-stack developer who went from gift pages for family and friends to shipping real products: websites, internal systems and apps for businesses in Nicaragua, Mexico and the United States, plus my own open-source tools.

I don't only write the code. I talk with the client, learn how the business actually runs, and stay until it works. At Comedor Doña Chola that meant setting up the waiter tablets and kitchen printers and writing the cashier guides for the staff.

My favorite problems live where product thinking, backend engineering, and applied AI meet. I care about privacy, safe defaults, and owning the whole path from an idea to something people actually use.

current_focus:  "Local-first AI, full-stack web, developer tools"
building:       "TrinaxAI · MirrorLab · ContaNI"
working_style:  "Spec → plan → tests → review → ship (AI agents help, they don't decide)"
languages:      "Spanish (native) · English (C2, EF SET 72/100)"
availability:   "Full-time, remote or on-site, immediate start · freelance projects welcome"

TrinaxAI is an open-source AI assistant that runs on your own computer and keeps inference and indexed data on your hardware by default. You ask about your documents and code, and it answers with a citation to the file it used. It combines a FastAPI backend, a React/TypeScript PWA, a terminal CLI, and a RAG engine for private files and code.

npm install -g trinaxai@latest
trinaxai setup

_{Cited answers · indexing · agent approvals · device pairing (tour from trinaxai.app)}

• Cited answers over your files with hybrid retrieval, collections and incremental indexing, plus optional web research, memory, voice and vision
• Local models through Ollama, with a profile chosen automatically from your RAM and GPU
• A coding agent confined to approved workspaces, with approvals for risky actions and a networkless sandbox for its terminal tool on Linux
• Scoped, revocable device pairing so other devices on your network only get the capabilities you grant
• Official installer on npm that verifies SHA-256 checksums; releases, CI and CodeQL for Linux, macOS and Windows
• 200+ Python and frontend test files covering the agent, CLI, RAG, security, pairing and services
• Honest documentation: its README lists known limits, such as which platforms are covered by CI but not yet by end-to-end runs

Explore the source →

A virtual camera for video calls, driven by your hands. Blurs or replaces your background, keeps you in frame, meters the light on your face, and covers the camera with a gesture. It shows up as a camera in Zoom, Meet, Teams, Discord and OBS. Desktop app for Windows, macOS and Linux, CPU only, nothing leaves your machine.

• Hold-to-confirm hand gestures for the privacy shutter, reactions and background switching, plus a local ctl command you can bind to any hotkey
• Fails closed: if the person mask is unavailable the whole frame is blurred, and a closed shutter never shows camera pixels
• About 30 fps at 720p on a laptop CPU, measured and documented in the repository
• Installers for Windows, macOS (Apple silicon) and Linux, each release with SHA256SUMS and build provenance
• Limits written down up front: it needs OBS on Windows and macOS, and the macOS build is not notarized yet

Website · Source →

Real products for real businesses, plus my own. Click any card to open the live site.

Belcons Remodeling Lead capture, project gallery and quote management for a remodeling company in Florida, with a private admin panel. Django · PostgreSQL · Cloudinary · Railway	ContaNI Accounting for small businesses in Nicaragua: journal, ledger, VAT (IVA), bank reconciliation and month-end close. Try it without an account. Next.js · TypeScript · Supabase · Clerk · 890+ unit tests	Shine Coffee Online coffee store in córdobas with PayPal checkout, order tracking and a role-based admin panel. JavaScript · Node · Firebase · Vercel
CEDAS Montessori Enrollment-focused school website: contact form, FAQ search and prerendered pages for Google. React · TypeScript · Firebase	Iglesia El Jobo Accessible community site with events, gallery and contact, tested on phone, tablet and desktop. React · Tailwind · Playwright	Rednura 42-product catalog with guides for 139 health conditions, a cart and ordering through WhatsApp. JavaScript · Firebase · Structured data
Neotonic Company landing page with SEO, security headers and a build step that validates the structured data. HTML · CSS · Firebase · JSON-LD	TrinaxBank · source Educational banking simulation: money in integer cents, atomic transfers with idempotency keys, step-up verification. 240+ unit/integration tests and 24 Playwright tests. Next.js · Prisma · NextAuth · MIT	Private systems Comedor Doña Chola: point of sale for a 12-table restaurant. I installed 4 tablets and 4 thermal printers and wrote the staff guides. El Rincón de los Antojitos: sales, costs and receivables dashboard. React · TypeScript · Supabase · Firebase

Also: ApexLumen, a Django educational platform with authentication, contributions, search, permissions, likes, ratings, comments and multi-format media.

_{Python · TypeScript · JavaScript · React · Next.js · Tailwind · Django · Node.js · PostgreSQL · Firebase · Supabase · FastAPI · Prisma · Docker · Linux · Git · GitHub Actions · Vercel · Ollama · LlamaIndex · OpenCV}

I use AI agents every day to move faster, but I don't let them decide on their own. Every change starts from a spec and a plan, is covered by tests, and gets my review before it's merged. That way I understand, and can maintain, all the code I deliver.

2022  ── First pages in HTML, CSS and JavaScript, learning on my own
2023  ── Gifts for family and practice websites
2024  ── Python, Django and my GitHub account (October)
2025  ── Harvard CS50W · first clients: Belcons, CEDAS, El Jobo, Rednura
2026  ── CS50x, HarvardX Professional Certificate and Stanford Code in Place · Comedor Doña Chola, Shine Coffee,
         Neotonic, ContaNI · TrinaxAI on npm · MirrorLab · trinaxcode.com

The constant has been simple: every project should teach me something the previous one could not.

Self-taught first, then verified: every certificate below links to its public verification page.

HarvardX CS50W Web Programming with Python and JavaScript October 2025 · CS50 certificate · edX verified	Harvard CS50x Introduction to Computer Science 2026 · ten problem sets and a final project · Verify
Stanford Code in Place Programming with Python April – May 2026 · Verify	EF SET English Certificate 72/100 · C2 Proficient Awarded 3 November 2026 · Verify

_{HarvardX Professional Certificate in Computer Science for Web Programming (CS50x + CS50W): earned November 2026.}

I'm looking for a full-time developer role, remote or on-site, with immediate start, and I still take freelance projects. If you need a website, an internal system, a point-of-sale setup or something with local AI, I'd like to hear about it.

Portfolio · CV · LinkedIn · X · Instagram · Facebook · ORCID

Understand deeply. Build simply. Ship what matters.