Hello, I'm Carlos A. Ruiz Castrejón, a Software Developer 👨🏻‍💻 and Professor 🧑🏻‍🏫

Professional Profile

Full-stack developer and university professor with over 9 years of experience in software architecture, system design, and enterprise solutions. Expert in Java technologies (Oracle Certified) and the integration of Generative AI into the software development lifecycle. Proven track record in building scalable digital solutions, from complex e-commerce integrations to academic research in AI-driven recommender systems. Bilingual (Spanish/English) and committed to technical excellence and continuous learning.

Core Backend & Enterprise: Java (EE/Jakarta EE, Spring Boot), .NET (C#), Python, Node.js.
Java Ecosystem: Expert in Object-Oriented Programming (OOP), API development (REST/SOAP), Maven, and Hibernate/JPA.
AI & Emerging Tech: AI-Assisted Development (GitHub Copilot, Cursor), Prompt Engineering, and Data Science.
Frontend & Web: Vue.js, Angular, JavaScript (ES6+), HTML5/CSS3.
Databases: Advanced SQL Server, PostgreSQL, and MongoDB.
E-commerce & Integration: WooCommerce, Shopify, Tienda Nube and third-party API orchestration.
DevOps & Version Control: Git, GitHub Actions, and CI/CD workflows.

Professor

Since January 2023

Teaching advanced courses in e-commerce, Algorithms, Software Design, and Web Applications.
Mentored students on practical projects, fostering their software development skills.

Software Programmer

Since January 2023

Developing enterprise web applications with a focus on scalable architecture and SQL Server integration.
Implementing complex business logic using C#, while maintaining cross-language compatibility for system migrations.

Software Developer

November 2019 – August 2020

Architected frontend systems using Vue.js and maintained backend API services.
Ensured data integrity and performance across relational database systems (MySQL).

Software Engineer

April 2019 – June 2019

Contributed to software development using C# for the back-end and Angular for the front-end.
Conducted unit testing to ensure software quality.

Programming Coordinator & System Analyst

March 2016 – April 2019

Led the development of departmental systems using .NET and Java-based logic for public administration.
Managed critical database infrastructure in SQL Server, ensuring high availability and security.

IT Technician

May 2015 – August 2018

Provided technical support for a range of hardware, software, and network issues, ensuring timely resolution to minimize downtime.
Installed, configured, and maintained computer systems, printers, and other essential IT equipment, supporting smooth daily operations.
Performed regular maintenance and troubleshooting, proactively identifying and addressing potential issues.

Intern – Android Developer

October 2014 – May 2015

Developed interactive mobile applications and games using Java and the Android SDK.
Mastered Java fundamentals and memory management while collaborating in agile teams.
Executed rigorous testing and debugging to ensure high-performance mobile experiences.

Web Administrator

August 2012 – February 2013

Ensured the daily publication of news articles, fostering a dynamic and engaging online presence.
Creatively designed eye-catching banners and images using Adobe Photoshop, enhancing the visual appeal of the website.
Conducted in-depth analysis of website analytics to gain valuable insights into user behavior and preferences.