Who is Alfonso Fonseca?

A full stack developer in Colombia and systems engineer with 6+ years of experience. He works remotely; his main stack is React, Next.js, TypeScript, Node, PHP/Laravel, WordPress, Python (Django/Flask), Java (Spring Boot), e-commerce, and DevOps (Docker, CI/CD).

Can I hire Alfonso as a remote full stack developer in Colombia?

Yes. Alfonso is a full stack developer in Colombia (GMT-5, overlapping U.S. and LATAM business hours) and works remotely in full-time roles or contract projects: frontend with React and Next.js, backend with Node, PHP/Laravel, or Python, custom WordPress and WooCommerce, headless e-commerce, and DevOps with Docker. Reach him through the contact form or book a call with the on-site assistant.

Where is he based and what work setup does he use?

He lives in Colombia and works remotely. He has worked with companies, agencies, and clients in Guatemala, Costa Rica, Puerto Rico, the United States, Argentina, and Peru. Open to remote full-stack, e-commerce, or DevOps roles.

What technologies does he use?

Frontend: React, Next.js, TypeScript, and JavaScript. Backend: Node.js, PHP (Laravel/Filament), Python (Django/Flask), and Java (Spring Boot). E-commerce/CMS: WordPress, WooCommerce, and Magento. DevOps: Docker, CI/CD, Git, and self-hosting.

What is his English level?

Native Spanish; conversational English at A1 plus everyday technical English: he reads documentation, issues, and specs in English and communicates in writing (tickets, pull requests, commits, and email) with tool support. He has worked with clients and agencies in the U.S. and Puerto Rico where part of the communication was in English. Best fit: teams with Spanish-speaking meetings or mostly written, async collaboration.

How can I contact him or book a call?

Use the contact form on alfonsofonseca.dev, email alfonso.fonseca.t@gmail.com, or the on-site chat assistant to book (Monday–Friday at 13:00 GMT-5; email and WhatsApp required).

What kinds of roles or projects interest him?

Full-stack roles, e-commerce (headless or Woo/Magento), APIs and integrations, and DevOps/self-hosting. He also builds his own products (SaaS, frameworks, and tools).

Can I leave a recommendation about his work?

Yes. At alfonsofonseca.dev/recomendaciones you can submit a review. Alfonso moderates them before they appear on the portfolio.

Alfonso Fonseca — Full Stack Developer in Colombia (remote)

Methodology

AI-augmented development

I use AI agentically in my daily engineering workflow: assisted coding, task automation, and agent orchestration—not just autocomplete.

Claude CodeMCPCursorLLM CLIs

Agentic coding with Claude Code and Cursor on remote servers (SSH)
MCP integrations (e.g. Atlassian/Jira) and custom tools
Report and worklog automation with LLMs and persistent memory
Sub-agent orchestration and prompt engineering for product work

Personal

PickUP — Custom full-stack framework

Hybrid framework (JavaScript + Python) to build dynamic sites and web systems, with layered architecture and a Python sidecar for specialized tasks.

TypeScriptNode.jsPythonReact

TypeScript/Node core with React UI and Python sidecar
Monorepo with npm workspaces and a leveled roadmap (L0–L5)
Self-deployed as a service on personal infrastructure

Personal

Self-hosted homelab

Personal self-hosted infrastructure across two servers: containers, web services, automated backups, and secure remote access.

DockerLinuxsystemdTailscale

Orchestration with Docker and Apache vhosts
SSH hardening + fail2ban, Wake-on-LAN, and rsync backups
Secure internet exposure with Tailscale

Personal

Personal finance dashboard

Multi-module panel for 50/30/20 budgeting, debt and investing, plus USD/COP monitoring, alerts, and analytics views.

FastAPIReactSQLiteChart.js

50/30/20 budget plus debt/savings/investment tracking
USD/COP rate history, alerts, and target-COP analysis
Unified portal with modules by subdomain

Personal

AI report automation

System that analyzes repository activity and generates progress reports in business language, with automatic email delivery.

BashLLM CLIcron

Activity classified into wins and issues
AI writing and scheduled delivery via cron

Client

Booking platform for a photography studio

Redesign and rebuild of a Guatemalan photography company’s booking site for its Christmas season: native theme without Elementor and a custom booking plugin, now live in production.

WordPressPHPMariaDBJavaScriptWP-CronDocker

Per-package calendar with capacity, time slots, and monthly (pre-season) pricing
End-to-end flow: request, payment-proof upload, link-based approval, and HTML emails
Cron job that releases unpaid holds and sends day-before reminders
Anti-spam (honeypot + per-IP limit) and migration of historical bookings from JetBooking/WPForms

Client (NGO)

Bilingual NGO website

Custom site for a non-profit: online donations, bilingual content (EN/ES), and security hardening.

WordPressPHPDockerStripePayPal

Custom theme/plugins; Stripe/PayPal donations with signed webhooks
EN/ES multilingual setup with Polylang
Hardened login, consent, and local Docker stack

Client

Multi-app headless e-commerce

Decoupled (headless) e-commerce platform serving multiple client apps from a central WordPress backend.

WordPress headlessReactREST API

Headless WordPress as the single source of truth
Decoupled frontends consuming a REST API

Client

Sales-force mobile apps

Mobile apps for sales force and delivery, with offline operation and multiple environments (dev, QA, production).

FlutterDartFirebase

Offline work with sync
Environment flavors and signed builds

Client

Multi-site measurement & analytics

Interaction-based measurement and event delivery to GA4/GTM across a dealer website network.

JavaScriptGA4Google Tag Manager

Per-button and interaction tracking
GA4 / GTM integration and event verification

Client

Dockerized Laravel + Vite environments

Dockerized development environments for a Laravel/Filament admin stack plus a Vite frontend, with a build pipeline.

LaravelFilamentViteDocker

Containers for Laravel/Filament backend and Vite frontend
Reproducible build and deploy pipeline

Personal · WIP

Nilo City — Browser city builder

Web city-builder inspired by Pharaoh: campaign, sandbox, and shared client/server simulation (sim + API + front monorepo).

Phaser 4TypeScriptViteFastifyPostgreSQL

Simulation package usable in the browser and an authoritative API
httpOnly cookie auth, saves, campaign, build/trade flows
Smoke tests, Playwright, and Docker; multiplayer not implemented yet

Product · WIP

Multi-tenant SaaS (funeral services)

Own multi-tenant product: clients, contracts, installments, payments, roles, and a platform admin panel with tenant isolation.

NestJSNext.jsPrismaPostgreSQLStripe

Postgres RLS + isolation tests across tenants
Stripe billing, Redis jobs, and transactional email
SEO landing; production deploy still pending

Personal

DevVault — Local secrets manager

Secrets and environment-link manager with encryption at rest and import/export compatible with known password managers.

FastAPISQLitecryptographyDocker

Scrypt + Fernet; master key never persisted
CSV import from 1Password / Bitwarden / Keeper / KeePass
Listens on localhost only; CSPRNG generator

Personal

Zync — Match predictions & ranking

Friendly betting and ranking app: points for correct calls, auto lock before kickoff, and result notifications.

DjangoSQLiteTailwindDocker

Bets lock 5 minutes before kickoff; configurable scoring
Ranking, admin CSV export, and i18n
Daily competition feed scripts

Personal

Dotcoins — Collectible marketplace

Collectible-image marketplace with internal points (no blockchain): purchase, transfer, and traceability.

FastAPIPostgreSQLReactVite

JWT access/refresh, Alembic, admin/buyer roles
React + Tailwind front in a Docker monorepo
Business rules that block invalid operations

Personal

Restream LAN — Local IPTV relay

Relay IPTV/HLS/RTSP/YouTube or files on the LAN, with an admin panel and optional EPG.

FastAPIffmpegyt-dlpDocker

HLS remux with stream copy (low CPU) and idle ffmpeg reaper
M3U export + XMLTV guide for clients like TiviMate
Persistent catalog in SQLite

Client · WIP

Subscriptions & payments API

Subscriptions, roles, and billing-cycle backend with a Colombian payment gateway, built for a park/policy-style product.

Node.jsExpressMySQLJWTePayco

JWT + refresh auth, roles, Helmet, rate limit, and audit trail
Plans, billing cycles, and documented ePayco integration
External integration roadmap still in progress

Personal

Internal voting — Employee of the month

Internal voting app: one vote per person, live ranking, and a PIN-protected admin panel.

Next.jsReactSQLiteTypeScript

better-sqlite3 persistence and employee seed data
Admin: add/deactivate, open/close voting, photos
Self-contained app ready for internal use

Personal

Public lottery analytics

Ethical scraper of public lottery results + frequency dashboard and heuristic scores (not a real predictor).

PythonStreamlitPlotlySQLite

Ingestion with requests/BS4 (Playwright only as fallback)
Hot/cold metrics, co-occurrence, and rolling windows
Docker + data refresh script

Alfonso Fonseca Full Stack Developer in Colombia · Systems Engineer & DevOps

Hi! I am Alfonso Fonseca

Experience

Interests

Technologies & skills

Frontend

Backend

E-Commerce & CMS

DevOps & practices

Languages

Projects & achievements

AI-augmented development

PickUP — Custom full-stack framework

Self-hosted homelab

Personal finance dashboard

AI report automation

Booking platform for a photography studio

Bilingual NGO website

Multi-app headless e-commerce

Sales-force mobile apps

Multi-site measurement & analytics

Dockerized Laravel + Vite environments

Nilo City — Browser city builder

Multi-tenant SaaS (funeral services)

DevVault — Local secrets manager

Zync — Match predictions & ranking

Dotcoins — Collectible marketplace

Restream LAN — Local IPTV relay

Subscriptions & payments API

Internal voting — Employee of the month

Public lottery analytics

Professional experience

Full Stack Developer — Tww

Web designer freelance

Backend / Web API Developer — Freelance

Frequently asked questions

What people say about Alfonso

Interested in working together?