Available · Q2 2026
10:28 ASU
00 / Intro Portfolio — v1.0

Diego
Vallejos.

Full-Stack Developer Backend specialist Team lead

I'm a web developer with over 10 years of experience building custom applications and systems — focused on efficiency, scalability, and the kind of quiet craftsmanship that makes software durable.

Contact me scroll to explore
01 / About
A decade
of craft.

I build custom applications and systems with a backend-first mindset — writing code that scales gracefully, performs under real load, and stays readable five years from now.

My specialty is backend engineering: clean data models, well-factored services, and APIs that feel obvious to consume. I've led development teams, managed the lifecycle of technology projects, and helped organizations modernize legacy systems without breaking what already works.

I'm currently finishing a degree in Computer Engineering and improving my English (B2 — in progress). Based in Asunción, working remotely with teams across the Americas.

10+
years shipping
40+
projects delivered
6
years leading teams
B2
English · in progress
02 / Skills

Four disciplines, one toolkit.

Hover or tap a card to focus it. Each area represents years of hands-on delivery — not a bullet list I memorized yesterday.

Core
Backend
active
  • 01PHP — Native, Laravel, CodeIgniter
  • 02MySQL & PostgreSQL data modelling
  • 03REST API design & customization
  • 04Code & performance optimization
UI
Frontend
active
  • 01HTML · CSS · Bootstrap · TailwindCSS
  • 02JavaScript, jQuery, basic React
  • 03WordPress & MODX customization
  • 04Responsive modern interfaces
Reach
SEO
active
  • 01On-page & off-page strategies
  • 02Keyword research & content tuning
  • 03SEO for WordPress and MODX
  • 04Performance for search rankings
Human
Leadership
active
  • 01Leading & mentoring dev teams
  • 02Project management
  • 03Scrum and Kanban delivery
  • 04Analytical problem-solving
03 / Toolkit

Stack I reach for.

Right tool, right job. No framework loyalty tests.

PHP
PHP
Laravel
Laravel
CodeIgniter
CodeIgniter
MySQL
MySQL
PostgreSQL
PostgreSQL
JavaScript
JavaScript
jQuery
jQuery
React
React
HTML5
HTML5
CSS3
CSS3
Bootstrap
Bootstrap
TailwindCSS
TailwindCSS
WordPress
WordPress
MODX
MODX
› hover to inspect
04 / What you get

Senior engineering, without the noise.

01
10+ years of experience

Seasoned judgement — earned by shipping, not reading about it.

02
Scalable, efficient solutions

Architectures that grow with the business, not against it.

03
Backend specialization

Data models, APIs, and services designed to be understood.

04
Team leadership

Calm, technical mentorship that makes teams better than they were.

05
Project management mindset

Scope, risk, and delivery — engineering that meets deadlines.

06
Performance-obsessed

Measuring first. Optimizing the parts that actually matter.

05 / Let's talk

Let's build something
exceptional together.

Open to full-time, contract, and advisory work. Typical reply within one business day.