Hi, I'm John Toro
Building scalable
and secure platforms.
Systems Engineer and Cybersecurity Specialist with over 18 years of experience. Expert in Cloud architectures, DevSecOps, and high-performance team leadership.
About Me
Professional Profile
Tech Lead and Senior Full Stack Engineer with over 18 years of experience designing and building scalable, secure, and high-impact software products. Specialized in modern ecosystems (TypeScript, React, Node.js, Golang, C#/.NET) and cloud architectures (Azure, AWS).
I have led technical teams in high-demand environments (such as Mercado Libre and Fintech/Web3 projects), applying agile methodologies and Clean Architecture principles. Furthermore, my solid background as a Cybersecurity and DevSecOps specialist allows me to integrate security practices (OWASP, Pentesting) from design to continuous deployment.
Experience
Completed
Experience
Software Engineering Senior Team Lead
February 2026 - PresentQuetzal International Services SAS
Team leader developing the centralized tool integrated with Salesforce via Celigo, for managing client cases where documents can be administered, quality review with AI, versioning, among other centralized configurations. Programming, review, and adjustment of vulnerabilities as technical debt and quality improvement based on SonarCloud.
NuxtJS 
NestJS 
Azure Azure DevOps 
Tailwind CSS 
Sidebase Auth 
OWASP Software Engineer Tech Lead
January 2025 - January 2026Quetzal International Services SAS
Leadership in cross-sectional applications for the company, providing tools that enable client case management, event handling, translations, among others.
NuxtJS NestJS Azure Azure DevOps Tailwind CSS Sidebase Auth OWASP Senior Software Engineer Tech Lead
March 2024 - December 2024Quetzal International Services SAS
Technical lead with experience directing and collaborating with development teams to create MarTech (Marketing Technology) solutions. Responsible for applications focused on client acquisition through segmented campaigns and event management tools to optimize and improve client service and tracking. I drove the standardization of the development portfolio, establishing a base architecture and leading the security strategy (DevSecOps) to proactively mitigate vulnerabilities.
NuxtJS NestJS Azure Azure DevOps Tailwind CSS Sidebase Auth OWASP Tech Lead
September 2022 - December 2023Zulu Tech
I led the team that created the B2C platform, allowing people to save in digital dollars (USDC) through integration with Web3 and making transfers via Polygon. This project was materialized using technologies such as Golang, Next.js, and React Native. I also directed part of the team that developed the B2B platform, making it easier for companies to transfer funds quickly and transparently. For this project, we used modern technologies like Next.js, Golang, Node.js, and Terraform.
React 
Next.js React Native 
Node.js 
Golang 
BigQuery 
Terraform Sr Software Engineer
October 2020 - September 2022Mercadolibre
I collaborated in the team responsible for integrating new countries into the KYC (Know Your Customer) validation using Golang. This system is in charge of validating personal and corporate documentation, either automatically or manually. Furthermore, I participated in an update aimed at improving the validation of manual cases, taking into account operators' suggestions to streamline case handling, reduce errors, and improve reliability. This update included report generation and monitoring of handled cases, detailing the time and operator associated with each case. Additionally, I developed an application in React and Golang for parameterizing rejection messages. This tool allowed for clearer and more precise configuration, providing users with detailed information on what to do in case of failures during the process.
Golang React 
Fury Senior Consultant
September 2019 - September 2020Indra Company S.A.S
I actively participated in the development team for the application responsible for calculating oil well consumption for Ecopetrol. This application maps the mathematical model, generating calculations and specific configurations for each well, achieving a notable 60% optimization in terms of savings. This project was carried out using C# and React. Additionally, I was part of the development team responsible for the maintenance of Ecopetrol's BDP application.
React 
C# Azure 
SQL Server Senior Back End Developer
May 2017 - August 2019Fuse Mobile S.A.S
I was part of the development team for the Alert Zone application, designed for monitoring and issuing general alarms in Australia through mass notifications. I also collaborated in the development of the application for Hunter Douglas, which allows for quoting blinds with different accessories. Furthermore, I was part of the development team for the payroll application Easy Payslip, recognized as the best application in Australia. This application provides tools for companies to generate their Payrolls and manage their employees at a very low cost. All development was carried out using Node.js, React, and Android.
React Node.js 
Android Azure 
Couchbase Lider Desarrollo .Net
September 2011 - April 2017Intergrupo
I was part of the team in charge of designing and implementing the Automatic Debit system for Factoring Bancolombia. We used CP300 and AS400 technologies with payment integration through digital certificates and efficient transaction management, all developed in C#. Additionally, I developed the integration with mobile operators for the launch of Móvil Éxito in collaboration with Grupo Éxito. This included handling IMEIs, black and white lists to guarantee optimal performance. I optimized database queries for Éxito points, improving performance and reliability for accumulation and discounting. Also, I created an application for Grupo Crystal destined to manage labels using Path Finder, integrating communication through services and guaranteeing the client application had no limitations. Furthermore, I developed an application for printing from the server using flat files.
C# SQL Server 
ASP.NET 
Xamarin Platform Administrator - Developer .Net
May 2010 - September 2011Inmel S.A.
I restructured the initial development created at Asesorías en Sistemas GOD, incorporating new features and improvements to adapt it to the company's workflow. I led the implementation across all branches nationwide, providing accompaniment to operators and making adjustments to ensure optimal use. Furthermore, I managed server administration, including Exchange, Active Directory, and the proxy, while providing comprehensive technical support to the company.
C# ASP.NET Reporting Services Developer VB.Net
November 2009 - May 2010GroupM Colombia
I built the web telephone directory using ASP.NET and VB.NET for internal use purposes. I implemented an independent security scheme so applications integrate in a centralized manner. Moreover, I developed an application for calculating equipment depreciation with cost integration into the accounting system. Additionally, I provided technical support to the company and managed Backup servers, Exchange, as well as application and data administration.
VB.NET 
Oracle SQL Server ASP.NET NET Developer
October 2008 - November 2009Asesorías En Sistemas GOD Ltda
I designed and developed the application for managing installation orders at Une Telecomunicaciones (now TIGO). The application allows for the creation of the order and performs full tracking through to the installation and/or return of equipment, including inventory management and control of installed and removed equipment. I developed the application in ASP.NET with C# and used a SQL Server database, generating reports through Reporting Services. Additionally, I was part of the team responsible for the installation and/or configuration of servers, proxies, and networks, as well as computer equipment maintenance.
C# ASP.NET SQL Server Reporting Services PHP Web Developer
April 2008 - October 2008Savia Grupo Tecnológico
I developed software for digital bartering, enabling digital exchanges. I also implemented a general forum; everything was developed using WordPress CMS, based on PHP with MySQL. I managed to create some custom plugins to improve platform interaction. Furthermore, I implemented the company's main page (brochure).
Joomla 
PHP 
MySQL Education
Specialization in Information Security
Politécnico Grancolombiano
2018 - 2019Systems Engineering
Instituto Tecnológico Metropolitano
2009 - 2014Information Systems Technology
Instituto Tecnológico Metropolitano
2005 - 2009Technical High School Diploma in Computer Science (Software Design)
I.E. Gilberto Álzate Avendaño
1999 - 2004Courses and Certifications
App Development with React Native
Platzi - May 2024Professional Docker
Edutin Academy - April 2024JavaScript Frameworks and Libraries Course
Platzi - March 2024Vue.js Course: Introduction and Fundamentals
Platzi - March 2024JavaScript Closures and Scope Course
Platzi - March 2024Clean Architectures for Software Development
Platzi - February 2024Pentest Diploma
Edutin Academy - January 2024Practical React Native: Forms, Storage and Deploy
Platzi - July 2023Practical React Native: List Management and API Consumption
Platzi - March 2023Introduction to React Native Course
Platzi - March 2023Creating UI Libraries for React Course
Platzi - February 2023JavaScript Asynchronism Course
Platzi - January 2023Basic JavaScript Course
Platzi - December 2022React JS, Golang and MongoDB Creating a Social Network like Twitter
Udemy - June 2022Complete Docker Course from Zero to Expert
Udemy - May 2022React, Redux, Typescript, Firebase: Fullstack Serverless
Udemy - August 2021Learn to program with Go (Golang)
Udemy - July 2021Scrum Foundation Professional Certificate (SFPC)
CertiProf - March 2020ReactJS and redux: frontend expert in Spanish
Udemy - March 2020Big Data Certificate
Politécnico Grancolombiano - December 2018Introduction to Xamarin
Campus MVP - June 2017Skills
Front-End & Mobile
Back-End
Bases de Datos & Data
Cloud & DevOps
Seguridad & Metodologías
Contact
Let's Talk
Open to exploring new professional opportunities and technical challenges. If you think my experience can add value to your team or organization, feel free to contact me.