OPEN TO FULL-STACK & AI SYSTEMS OPPORTUNITIES · 2026

JULIÁN VILLALBA // SYSTEMS & FULL-STACK ENGINEER

Building resilient full-stack platforms, event-driven AI automations, and zero-trust backend systems.

Transforming complex business logic into high-performance web products with sub-second latency and strict type safety.

Experience

3+ Years in Production & IT Ops

Stack

React/Next.js · NestJS · TS · Docker · Python

Security

Certified MinTIC Cybersecurity & Threat Mitigation

English

Certified EF SET C1 Advanced

WhatsApp GitHub LinkedIn Email

Next.js●TypeScript●NestJS●Python●Supabase●PostgreSQL●Docker●n8n●Playwright●Redis●Tailwind CSS●Linux●Git●Sentry●Web Crypto API●Next.js●TypeScript●NestJS●Python●Supabase●PostgreSQL●Docker●n8n●Playwright●Redis●Tailwind CSS●Linux●Git●Sentry●Web Crypto API●

01 / Core Specializations

Engineering Execution Matrix

I don't list tools. I ship platforms, automations, and hardened backends on published timeframes — with the architecture decisions to back it up.

Full-Stack SaaS & Web Applications

Delivery · 2–6 weeks

Low-latency dashboards, e-commerce with dynamic checkout, JAMstack platforms, and end-to-end typed APIs with strict contracts.

Next.jsReactTypeScriptTailwind CSSSupabasePostgreSQLNestJS

AI Automation, Agents & Data Scraping

Delivery · 1–3 weeks

Multi-agent Telegram/WhatsApp chatbots, n8n ETL pipelines, headless Playwright scrapers, and LLM parsing (OpenRouter, DeepSeek).

Pythonn8nPlaywrightFastAPIDockerTelegram Bots

Backend Engineering, DevOps & Security Hardening

Delivery · Continuous / Architecture

NestJS microservice architecture, SHA-256 cryptographic auth, Datadog/Sentry observability, and containerized Linux/AWS deploys.

Node.jsNestJSDockerPostgreSQLRedisLinuxOWASP Top 10

02 / Production Deployments

Systems & Architecture

Inspect Overview, Architecture Specs, and Live Payload. Copy endpoints. Open live demos when they exist.

PAYLANCE

FinTech · SaaS

PayLance Pro

Code

paylance.local

$ deploy bilingual-freelance-pay▍

Next.jsTypeScriptTailwind CSSSHA-256 Signing

Enterprise SaaS platform for managing international freelancers and settling contracts with SHA-256 cryptographic signing.

Integrity98%

Settle SLA91%

Sign Latency88%

Next.jsTypeScriptTailwind CSSSHA-256 SigningWeb Crypto API

AHT

SaaS · Analytics

AnnotatePay / TaskRate

Code

aht.local

$ deploy annotate-pay▍

Next.jsTypeScriptSupabasePostgreSQL

SaaS dashboard for remote workers and data annotators: dynamic AHT calculation, revenue tracking, and immutable rate snapshots.

AHT Accuracy94%

Payout Lock99%

Ingestion90%

Next.jsTypeScriptSupabasePostgreSQLTailwind CSS

RELAY

AI Automation

Autonomous Data & ChatOps Pipeline

Code

relay.local

$ deploy workflow-automation▍

n8nPythonDockerPlaywright

Autonomous pipeline orchestrated with n8n, Telegram/WhatsApp webhooks, DeepSeek/OpenRouter models, and Playwright scrapers in Docker.

DAG Success93%

Parse Rate88%

Uptime95%

n8nPythonDockerPlaywrightOpenRouter LLMsPostgreSQL

RIG

AI Agent

Hardware Consultant AI Agent

Code

rig.local

$ deploy hardware-consultant-agent▍

PythonTelegram Bot APIPlaywright ScraperFastAPI

Conversational hardware advisor for Telegram that parses natural-language requirements and quotes budget-optimized PC builds.

NL Parse90%

Compatibility86%

Quote Speed92%

PythonTelegram Bot APIPlaywright ScraperFastAPI

SALEM

E-Commerce

Salem Store Boutique & Go

Live Code

salem-store-boutique.vercel.app

$ deploy salem-store-go▍

React.jsTypeScriptTailwind CSSSupabase

High-conversion boutique e-commerce catalog with direct WhatsApp checkout, decoupled architecture, and Edge CDN rendering.

Edge Hit96%

WA Conversion81%

TTFB93%

React.jsTypeScriptTailwind CSSSupabaseVercel Edge

AJAIA

Realtime · Collab

Ajaia Doc Editor

Code

ajaia.local

$ deploy ajaia-doc-editor▍

Next.jsTypeScriptSupabase RealtimeTailwind CSS

Low-latency real-time collaborative document editor with concurrent state synchronization.

Sync p9589%

Conflict-free95%

Presence97%

Next.jsTypeScriptSupabase RealtimeTailwind CSS

LOCK

Backend · Scheduling

Reservation Engine

Live Code

proyecto-reserva.vercel.app/reservas

$ deploy proyecto-reserva▍

ReactNestJSPostgreSQLVercel

Reservation and scheduling engine with strict DTO validation and time-slot concurrency control.

No Overbook99%

Hold TTL87%

Concurrent94%

ReactNestJSPostgreSQLVercel

03 / Career Trace & Operations

Experience

May 2024 — Jul 2026

Full Stack Developer

Soluciones Tecnológicas La Bendición de Dios · Remote / Barranquilla

Owned fintech architecture and KYC/KYB flows with explicit API contracts.
Shipped React.js, NestJS, TypeScript, PostgreSQL, Supabase and Redis in production.
Built CI/CD pipelines with Docker and Kubernetes on Azure/AWS.
Operated observability and triage with Datadog, CloudWatch and Sentry.

May 2022 — May 2024

IT Operations Analyst & Backend Developer

Soluciones Tecnológicas La Bendición de Dios · Remote / Barranquilla

Automated internal operations with Python, Java and Terraform.
Tuned PostgreSQL and MySQL queries to cut p95 latency.
Maintained high availability: backups, change windows, healthchecks.

04 / Verified Credentials & Clearance

Security & specs

Systems Engineering

Universidad Simón Bolívar · In progress

Technical Degree in Systems

SENA · Graduated

Cybersecurity Intermediate Bootcamp

MinTIC & TalentoTech · Intermediate · Hardening, Red Team & threat mitigation · 2024

EF SET Certificate

EF SET · C1 Advanced · 62/100 · 2024

05 / Direct Dispatch & Contact

Available for Full-Stack, Backend & AI Automation roles.

Remote / Worldwide. Book a 15-minute video call or reach me directly on WhatsApp — I reply within one business day.

WhatsApp · +57 304 677 8813 Email me

GitHub ↗LinkedIn ↗