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Hi, I'm Agustín.

An Experienced Full Stack Developer

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About Me

Hi, I'm Agustín Vázquez Cendron, a Senior Full Stack Developer based in Patagonia Argentina...

...with over 10 years of experience in enterprise application development. Specialized in .NET, C#, REST APIs, and React-based frontends. Experienced in leading teams, modernizing legacy systems, and designing scalable solutions. Currently focused on AI-assisted development, prompt engineering, and evaluating LLM-generated outputs — with hands-on experience training and refining AI models through tools such as Claude AI, GitHub Copilot, and ChatGPT.

My work has been featured in:

Work Experience

2025 — Present
Senior Full Stack Developer
Freelance Patagonia, Argentina (Remote)
  • Design, development, and maintenance of web applications, primarily using the MERN stack (MongoDB, Express.js, React.js, Node.js).
  • Evaluation and correction of LLM-generated code outputs, integrating AI-assisted results into production codebases. Primary AI assistant used: Claude AI.
  • Design and testing of technical prompts targeting edge cases in complex coding domains, including API design, data modeling, and algorithm implementation.
I work with:
Node.js React.js MongoDB Express.js .Net Core SQL Server C# Javascript Typescript Claude AI ChatGPT GitHub Copilot
2018 — 2025
Senior Full Stack Engineer
Charles Taylor InsureTech London, UK (Remote)
  • Design and implementation of business process applications for corporate banking, insurance companies, and insurance brokers, plus participation in internal software development projects.
  • Design and development of REST APIs with .NET Core.
  • Leadership of Scrum teams of 4–5 developers.
  • Migration of legacy systems to .NET Core.
  • Development and maintenance of scripts in Transact-SQL (SQL Server), PL/SQL (Oracle), MongoDB, and Azure CosmosDB.
  • SQL Server script optimization.
  • Integration of AI assistants into the development process (GitHub Copilot).
  • Work in distributed agile environments.
  • Requirements analysis (User Stories).
  • Performe project management of estimating, scheduling and monitoring tasks.
I work with:
C# ASP .Net MVC .Net Framework .Net Core Node.js React.js SQL Server Oracle NHibernate Javascript Typescript Angular 2+ HTML5/CSS3 SCRUM MS TFS GIT Azure DevOps Azure CosmosDB GitHub Copilot
2015 — 2018
Fullstack Senior Software Analyst & Developer
Inworx SA Buenos Aires, Argentina
  • Application development with ASP.NET MVC and SQL Server.
  • Implementation of REST APIs for React frontends.
  • Query and stored procedure optimization.
  • Participation in system architecture and evolution.
  • Legacy system maintenance.
  • Conduct training for new developers.
  • Coding, testing, and fixing programming errors.
  • Backlog negotiation and project estimations.
I worked with:
C# ASP .Net MVC .Net Framework Delphi SQL Server Oracle NHibernate Javascript Angular Js HTML5/CSS3 SCRUM MS TFS
2012 — 2015
IT Support & Software Developer
OSI Control & Computers Pto. San Julián, Argentina
  • Development of new tools and applications.
  • Creation and maintenance of websites.
  • IT infrastructure changes and installations.
  • Repair/upgrade of existing applications.
  • IT support for other employees.
  • Technical advisory to users on all system-related inquiries.
  • Development and implementation of web applications based on client requirements.
  • Installation and configuration of computer networks.
I worked with:
ASP .Net MySQL Visual Basic Javascript JQuery PHP GIT

Education

2010 — 2015
Bachelor's Degree in Systems and Computer Science

University of La Plata | La Plata | Argentina

Bachelor's degree in Computer Science, 5 years long (2010-2015). I entered university in 2010 and finished my studies in 2015. Then, I spent 3 years preparing the thesis. The name of it is "Layered Architecture: analysis and case study of the "n-layer" architectural model and its variants", which I approved with note 8.

2017
.Net Conf AR

Microsoft Argentina | Buenos Aires | Argentina

The latest on Microsoft technologies with top experts, a unique opportunity to learn, share, networking and fun! Workshops! Conferences! All in an informal environment.

.Net Core .Net Framework Xamarin Typescript Javascript Angular Blockchain Machine Learning Power BI Azure SQL Server
2010 — 2012
Associate Degree in Systems and Computer Science

University of La Plata | La Plata | Argentina

Asociate degree in Computer Science, 3 years long (2010-2012)

2015
Specialization Course

LIFIA Research Center of the National University of La Plata | La Plata | Argentina

Advanced specialization course in Object Oriented Design, Design Patterns and UML.

Design Patterns UML OO Design
2020
Microsoft SQL Server 2019 Essential Training

LinkedIn

Master the fundamentals of SQL Server 2019, the industry-leading database management platform from Microsoft.

Certificate

SQL Server DBA
2020
React.js

LinkedIn

This course guides you through the foundations of React development, including the use of React hooks—a new feature starting in React 16.8 that allows developers to add functionality to components without writing classes

Certificate

React.js
2020
Building Applications with Angular, ASP.NET Core, and Entity Framework Core

LinkedIn

This course teaches integration through the perspective of a quiz project, with instructor Alexander Zanfir showing how to use Angular, ASP.NET Core, and Entity Framework Core to develop a full-stack application. Alexander explains how to display and edit data in Angular with ASP.NET Core, create forms, navigate to different views, and more.

Certificate

ASP.Net Core Angular Entity Framework Core
2020
Node.js

LinkedIn

This course acquaints you with all of the basics, showing how to install Node.js and work with the Node.js core, which includes standard input, standard output, the module system, the file system, and how to write and run JavaScript on the server.

Certificate

Node.js

Core Technical Skills

Backend and API Development
  • C#
  • .NET Core
  • .NET Framework
  • ASP.NET MVC
  • Node.js
  • Express.js
  • Microservices
  • RESTFul API
  • Entity Framework
  • NHibernate
Frontend Development
  • React.js
  • Redux
  • JavaScript (ES6+)
  • TypeScript
  • Angular 2+
  • AngularJS
  • HTML5 / CSS3
Databases
  • SQL Server
  • Oracle
  • Azure Cosmos DB
  • MongoDB
  • MySQL
Cloud & DevOps
  • Azure
  • Azure DevOps
  • Docker
  • Kubernetes
  • CI/CD
  • Azure Service Bus
  • Kafka
  • DAPR
  • GIT
Project Management and Methodologies
  • Jira
  • Trello
  • TFS
  • Agile
  • Scrum
AI & Prompt Engineering
  • Prompt Design
  • LLM Evaluation
  • AI-Assisted Dev
  • GitHub Copilot
  • Claude AI
  • ChatGPT
Architecture & Patterns
  • Clean Architecture
  • CQRS
  • SOLID
  • Event-Driven
  • Domain-Driven
  • Spec-Driven

Portfolio

Work 4
Co-Med: a healthcare system for a Doctor's Office

Full Stack Development

Co-Med is a full-stack web application for managing medical office operations, built on the MERN stack (MongoDB, Express.js, React, Node.js). The platform covers the core workflows of a medical practice: patient registration and management, appointment scheduling, clinical history tracking, and prescription generation. The frontend is built with React and delivers a responsive, single-page experience, while the backend exposes a RESTful API with Node.js and Express, persisting data in MongoDB. The project was developed end-to-end as a personal initiative, covering architecture decisions, data modeling, and full-stack implementation.

Node.js | Express.js | React.js | MongoDB
Work 2
Website and Mobile app for Osi Control & Computadoras

Full Stack Development

Osi Control & Computadoras is a full-stack web project developed for a technology and computer services company. It consists of two parts: a public-facing SPA landing page built with Angular and Firebase, featuring dedicated sections for different customer segments — retail shops, home users, and businesses — and an internal admin dashboard built with Node.js and React for managing company operations. The project covers the full scope from customer-facing UI to back-office tooling, delivered as a complete freelance engagement.

Angular | Firebase | Node.js | Express.js | React.js | MongoDB
Work 3
PomodoRock: PWA built with React for focus and productivity.

PWA | Web Development | Productivity

PomodoRock is a Progressive Web App built with React, Redux, and Firebase, designed around the Pomodoro Technique to help users manage their focus and productivity. The app allows users to break work into timed sessions, assign custom labels to each session, and receive browser notifications when a session ends. It includes a statistics dashboard powered by Chart.js that visualizes productivity patterns — time spent per label and most productive days of the week. Users can sign in to sync their data across devices via Firebase, and the app works fully offline thanks to its PWA architecture. The UI is built with Material UI and styled-components, with dark mode support and installability across any PWA-compatible browser.

React.js | Redux | Firebase | CSS3 | SCSS
Work 3
Online Resume

Web Design | Web Development

My Resume is a personal online CV built from scratch using HTML5, CSS3, SCSS, and jQuery, deployed as a static site via GitHub Pages. Rather than using a website builder or template generator, the site was hand-coded and customized end-to-end — covering layout, responsive design, SCSS theming, and interactive sections. It serves as a live, always up-to-date representation of professional experience, skills, and portfolio work, accessible at a custom domain.

Javascript | jQuery | HTML5 | CSS3 | SCSS