Portfolio · 2026 · V.3
Based in · Lat-Am
Role · Full-Stack Dev
Local time ·

Derian Marchan— web developer.

Portrait of Derian Marchan, full-stack web developer
Derian, 2024

I build web products that are serious, fast and maintainable. System architecture, AI integrations and user experiences polished down to the last pixel.

Available for projects
Scroll to explore
/01About
Since 2019

A developer who thinks in systems, not just screens.

I've spent years designing and shipping web apps where frontend, backend and infrastructure speak the same language.

Angular and Laravel are my baseline, but the interesting stuff happens at the edges: real-time WebSockets, AI with tool-calling, interactive maps, architectures that scale without breaking.

Serious, methodical and detail-obsessed — both in code and in the interface.

6+
Years of experience
30+
Projects shipped
12+
Technologies mastered
/02Tech stack
15 tools · production-proven

The tools I use every day.

Angular
Laravel
NestJS
Express.js
WebSockets
TypeScript
MySQL
PostgreSQL
Redis
Linux + Nginx
AI + Tools
Google Maps
Astro
System Arch.
n8n
Angular
Laravel
NestJS
Express.js
WebSockets
TypeScript
MySQL
PostgreSQL
Redis
Linux + Nginx
AI + Tools
Google Maps
Astro
System Arch.
n8n
01
Angular
v6 — v21 · Signals · RxJS
02
Laravel
v6 — v13 · APIs · Queues
03
NestJS
Enterprise · Microservices
04
Express.js
Node.js · REST · Middleware
05
WebSockets
Real-time · Socket.io · ws
06
TypeScript
Typed · Strict mode
07
MySQL
Relational · Tuning · Indexing
08
PostgreSQL
Relational+ · JSONB · CTEs
09
Redis
In-memory · Cache · Pub/Sub
10
Linux + Nginx
VPS · Reverse proxy
11
AI + Tools
Tool-calling · LLM Integration
12
Google Maps
API · Geo · Routes
13
Astro
Static · Islands · MDX
14
System Arch.
Design · Scalable systems
15
n8n
Automation · Workflows · Cron · APIs
/03Selected work
10 projects · 2020 — 2026

Recent work.

01 / 10
Modular Enterprise ERP — Cash, HR, cost centers and quotes
ERP in active development with modules for cash flow, HR, cost centers, quotes and projects. Laravel + Angular architecture on PostgreSQL, approval workflows and full per-entity audit trail.
Laravel 12Angular 21PostgreSQLSanctum
02 / 10
AI Assistant with Tool-calling — Integrated into the ERP
AI layer inside the ERP that queries modules in natural language, downloads files and creates database records straight from chat. Multi-provider (Gemini, OpenAI, DeepSeek) with structured schemas.
LaravelAITool-callingPostgreSQL
03 / 10
Hotel Management — Front-desk, checkout and e-invoicing
Full hotel system: front-desk, checkout, sale of services and products to guests linked to the stay, and integrated e-invoicing. Room management, rates and per-stay consumption.
AngularLaravelMySQLE-invoicing
04 / 10
Multi-Hotel Central Kitchen — Orders from multiple hotels
Single-kitchen system serving orders from several different hotels. Each hotel sends real-time orders and the kitchen centralizes operations. No payment module, full focus on order ops.
AngularNestJSWebSocketsPostgreSQL
05 / 10
Internal Booking-style Reservations — Connected to hotels
Internal reservations platform for a company with direct connection to its hotels, Booking-like flow at internal scale. Availability sync and two-way real-time notifications.
AngularLaravelWebSocketsMySQL
06 / 10
Real-time Notifications — WebSockets across systems
Real-time communication layer using WebSockets that connects the hotel system, central kitchen and reservations. Two-way notifications of orders and events across independent servers.
Socket.ioNode.jsRedisTypeScript
07 / 10
Law Firm Management — Case files and internal cash
Custom system for a law firm: case-file management with per-case tracking and an internal cash module for movements. Compact scope, focused on the firm's daily workflow.
AngularLaravelMySQL
08 / 10
Custom CMS for Landing Pages — Client-editable content
Custom-built CMS so clients can manage their landing content without touching code. Section, image and text editor with preview and direct publish.
AngularLaravelMySQLS3
09 / 10
n8n Automations — WhatsApp, email and scheduled workflows
n8n flows to auto-send WhatsApp messages, daily runs that consume external APIs and route results to email. Simple, robust integrations for repetitive business tasks.
n8nWhatsApp APIRESTCron
10 / 10
COVID Basket Delivery — Geo-tagging and photo verification
Basket delivery app during COVID with geo-tagged capture at the drop-off point and photo evidence. Admin panel with Google Maps to verify each delivery happened at the right location.
AngularLaravelGoogle MapsS3
LIVE
01
/04Services
What I can build for you

How we can work together.

/01
Custom web apps
Complete web products, from the first screen to the infrastructure. Angular, Laravel, Nest — whatever the problem needs.
Full-stack Available
/02
AI Integration
I add LLMs with tool-calling to your product: assistants, automations and flows that read and write in your own system.
AI · Tool-calling Available
/03
Architecture & Scaling
Systems design: DBs, queues, Redis caching, Linux + Nginx deploy. So the product keeps working as it grows.
VPS · DevOps Available
/05Contact

Let's have a conversation. derianmarchan@gmail.com

Start a project
Location
Lat-Am · GMT-5