Hello, my name is
Gerardo Arrieta
And I am

Full-Stack Developer.

SaaS Product Builder.

Hire me

About me

I am Gerardo and I am

I am a Full-Stack Developer focused on building reliable software that solves real business problems. My professional experience spans frontend development with React and JavaScript, backend development with .NET and C#, REST APIs, SQL Server, and desktop applications built with WPF and the MVVM architecture pattern.


I work across the complete product lifecycle: understanding operational needs, designing and implementing features, improving existing systems, and delivering maintainable solutions. My background in accounting also gives me a practical perspective when translating financial and administrative processes into software.


I am currently building ZagaPro, a productivity SaaS designed to help automotive workshops centralize their daily operations. It brings together customers, vehicles, estimates, work orders, inventory, purchases, delivery notes, and invoicing in one platform, turning complex workflows into a clear and efficient digital experience.


I am committed to continuous learning, clean code, and creating products that provide measurable value to the people and businesses that use them.

Download CV

My Services


Frontend Developer

I offer you security and compliance when creating, designing, updating and maintaining advanced web portals on the client side (Front-end) through: HTML5, CSS3, JavaScript and REACT JS. . You'll love your Website.


Fully Responsive

Your site will display properly on any device, including desktop computers, tablets and mobile phones.

A good and attractive web design helps you keep your leads on your site, which is the digital face of your business.


Backend Developer

As a Backend Developer, I have prepared myself to build API's (Application Programming Interfaces), as well as developing applications with WPF (Windows Presentation Foundation), maintaining good coding practices, currently working with .NET.

My Skills

FULL-STACK MINDSET

From business needs to working software.

I combine product thinking with hands-on development to create applications that are useful, maintainable, and ready to evolve. ZagaPro is where these skills come together in a real SaaS product used to simplify workshop operations.

01

Frontend

Responsive, accessible interfaces designed around real user workflows.

  • React
  • JavaScript
  • HTML5
  • CSS3
02

Backend

Reliable business logic, integrations, and APIs built for long-term growth.

  • .NET
  • C#
  • REST APIs
  • Clean Code
03

Data & Desktop

Structured data and desktop solutions that support daily operations.

  • SQL Server
  • WPF
  • MVVM
  • Data Modeling
04

Product Engineering

Turning operational problems into focused features and sustainable products.

  • SaaS
  • Git
  • Scrum
  • Problem Solving

Always learning. Always improving the next release.

Explore my GitHub

My Portfolio

A selection of products and solutions built around real users, business processes, and measurable value.

Conceptual preview of the ZagaPro workshop management dashboard Product concept
FLAGSHIP PRODUCTPRIVATE SAAS

ZagaPro

A full-stack SaaS platform that centralizes customers, vehicles, estimates, work orders, inventory, purchases, delivery notes, and invoicing for automotive workshops.

  • React
  • .NET
  • SQL Server
  • REST API
  • SaaS
Request a demo
NEXSTA sports and culture platform
DIGITAL PRODUCT

NEXSTA

A fast, mobile-friendly platform for discovering Valencia through sports, arts, cuisine, live games, standings, and curated content.

  • Frontend
  • Responsive
  • Media
View project
Columbarium management application
MANAGEMENT SYSTEM

Columbarium

A database-backed management application designed to register and maintain columbarium records through a complete CRUD workflow.

  • JavaScript
  • PHP
  • MySQL
  • CRUD
View project
A&A Consultores Tributarios website
CLIENT PROJECT

A&A Consultores

A professional digital presence created for a tax consultancy, combining business knowledge with clear and accessible web communication.

  • Client Work
  • Web Design
  • Accounting
View project
Gerardo Arrieta YouTube channel
CONTENT & COMMUNITY

YouTube Channel

I share programming knowledge, practical development experiences, and lessons from building software products such as ZagaPro.

  • Programming
  • Education
  • Community
Visit channel
CONTENT & COMMUNITY

Sharing what I learn along the way.

My EbookProgramming after 40

My Portfolio

Ebook
Ebook

Project made with REACT.JS, created to promote my ebook "MI EXPERIENCIA COMO PROGRAMADOR DESPUÉS DE LOS 40s". It has added an input to suscribe to myNewsletter.

Biolink Gerardojao
My Own Bio-link

Biolink made entirely with REACT JS, a site where I can order my personal links.

Singer Searcher
Singer Searcher

If you want to know a little more about your favorite singer or Group, you can use this web, Made with React JS.

Apple Bite
Apple Bite

Website made at the request of a client, completely made with responsive design and with REACT JS. Apple Bite has access to social networks and contact form.

Personal Blog
Personal Blog

Personal Blog, Here I show you my blog, it is new but my first article is very interesting.

A&A Consultores
A&A Consultores Tributarios

Website created for the accounting office A&A Consultores Tributarios.

Momentos Ballons
Momentos Ballons.

Web site built for a client's request, a company dedicated to the training of events. Made with Vanilla Javascript and deploy with VERCEL.

Nexsta
NEXSTA.

NEXSTA brings Valencia to the world—sports, arts, and cuisine on one screen. Watch live games and replays, track standings, and explore curated highlights and players to watch. Clean, fast, and mobile-friendly—built for fans and culture lovers alike.

Columbarium
Columbarium

Project made with HTML, CSS, JavaScript, a little PHP and MySQL, a CRUD to keep the record in a Columbarium.

Chronometer
Chronometer

Measure the time you carry out that project or how much you dedicate to your studies or work with this Timer.

Youtube Channel
Youtube Channel

Welcome to my channel! I’d love for you to check it out and share your feedback so I can keep growing and improving.

Message sent successfully

Gerardo Thank you for contacting me, I will contact you as soon as possible.

Close

Contact me

Get in Touch

I am currently located in Spain, but I am from a city is known as the musical capital of the Venezuela, for me the best city in the world, Barquisimeto.

Name
Gerardo Arrieta
Location
Valencia, España
Email
Gerardojao@gmail.com
Message me