Javier Montalvo

Senior Full Stack Developer

Quito, Ecuador

Summary

Senior Full Stack Developer with 10+ years of experience building, scaling, and modernizing web platforms across enterprise and startup environments. Expert in the modern JavaScript ecosystem (React, Next.js, Vue.js, Node.js), backend development (Python, Golang, C#, PHP), and cloud infrastructure (AWS). Pioneer in integrating AI-powered solutions using OpenAI APIs for intelligent automation, chatbot development, and data analysis. Proven track record leading large-scale legacy system migrations (AngularJS to Vue.js), architecting scalable microservices, and delivering high-impact features that improve performance, reduce costs, and enhance user experience. Passionate about clean code, SOLID principles, and mentoring teams to achieve technical excellence.

Experience

PPM

Development Specialist

Quito, Ecuador

Dec 2022 - Oct 2025
Led AI, platform modernization, and cloud optimization initiatives across frontend and backend systems.
- Pioneered AI-driven automation initiatives by integrating OpenAI APIs to analyze sales conversations from Microsoft Teams, extracting sentiment and tone insights that enabled data-driven coaching for sales teams and improved conversion rates by 20%.
- Architected and deployed an intelligent Telegram chatbot using n8n workflow automation and the OpenAI API to provide 24/7 customer support for one of Ecuador's largest platforms, handling 500+ monthly queries and reducing support ticket volume by 45%.
- Designed AI-powered data analysis pipelines leveraging OpenAI APIs to extract actionable insights from unstructured business data, accelerating decision-making processes for executive leadership.
- Led technical initiatives for modernizing a legacy platform, collaborating with cross-functional teams to migrate critical services from Laravel/PHP to Golang and C# microservices architecture.
- Developed end-to-end features across the React frontend and multiple backend services (Laravel, Golang, C#), improving application performance by 40% and reducing customer-reported bugs by 35% through comprehensive code reviews and automated testing.
- Optimized AWS infrastructure (EC2, S3, RDS, Lambda), reducing cloud costs by 25% while improving system reliability to 99.8% uptime.
- Mentored mid-level developers on clean code principles, design patterns, and best practices; established team standards for code reviews and Git workflows.
- Contributed to PostgreSQL database optimization, improving query performance by 50% for high-traffic endpoints.
Kruger Corp

Freelance Full Stack Developer

Quito, Ecuador

Aug 2021 - Dec 2021
Delivered enterprise applications and containerized full-stack solutions for a cloud-native environment.
- Developed enterprise-level applications collaborating with senior creative and engineering teams, delivering critical features for a containerized microservices architecture.
- Built and maintained full-stack applications using an AngularJS frontend and a Node.js backend, deployed on Docker and Kubernetes orchestration in AWS cloud environments.
- Implemented RESTful APIs and integrated third-party services, ensuring enterprise security standards and scalability requirements.
- Planned, documented, and managed technical tasks using Agile methodologies; created comprehensive technical documentation that improved team velocity by 30%.
- Participated in code reviews and architectural discussions, contributing best practices for containerization and cloud deployment strategies.
Trade Ec

Frontend Associate Engineer

Quito, Ecuador

Jul 2020 - Jan 2021
Built responsive web and mobile interfaces while improving reuse, consistency, and performance.
- Developed responsive web interfaces using React and cross-platform mobile applications using React Native, implementing reusable component libraries that reduced development time by 25%.
- Integrated frontend solutions with Node.js RESTful APIs following SOLID principles, implementing proper error handling, loading states, and data validation.
- Improved UI/UX consistency across web and mobile platforms by implementing a design system and component documentation, reducing design-to-development handoff time by 40%.
- Implemented state management using Redux for complex application state, ensuring predictable data flow and easier debugging.
- Participated in code reviews and pair programming sessions with senior developers, learning React best practices and clean architecture patterns.
- Optimized application performance through code splitting, lazy loading, and memoization techniques, improving initial load time by 30%.
Grupo Céntrico

Frontend Developer

Quito, Ecuador

Nov 2016 - Jul 2020
Drove a major AngularJS to Vue.js migration and established standards for scalable frontend development.
- Led the complete migration of a large-scale frontend application from AngularJS to Vue.js, coordinating with an 8-person development team to refactor 50,000+ lines of code over 12 months without disrupting production.
- Designed and implemented a GraphQL API layer in Python to unify data access across MongoDB and Neo4j databases, reducing API response times by 60% and simplifying frontend data-fetching patterns.
- Established frontend architecture standards, created a reusable component library, and wrote development guidelines adopted across 3 product teams, improving code reusability by 50%.
- Developed complex single-page applications using Vue.js, Vuex for state management, and Vue Router for navigation, serving thousands of daily active users.
- Mentored 6 junior and mid-level developers on Vue.js, GraphQL, and modern JavaScript (ES6+), conducting weekly technical workshops and code review sessions.
- Collaborated with cross-functional teams (backend, DevOps, design, product) to deliver scalable, maintainable solutions that supported 300% user growth over 3 years.
- Implemented CI/CD pipelines for automated testing and deployment, reducing deployment time from 2 hours to 15 minutes.
Shiftam

Web Developer

Quito, Ecuador

Jul 2014 - Nov 2016
Built custom web platforms for multiple clients across content, commerce, and marketing use cases.
- Delivered full-stack web solutions for 15+ clients using HTML5, CSS3, JavaScript (jQuery), PHP, and MySQL, ranging from corporate websites to e-commerce platforms.
- Developed custom WordPress themes and plugins, implementing responsive designs that improved mobile user engagement by 40%.
- Built RESTful APIs and integrated third-party services (payment gateways, email marketing, analytics) to extend application functionality.
- Implemented database schemas and optimized MySQL queries for efficient data retrieval and storage in high-traffic applications.
- Worked directly with clients to gather requirements, provide technical consultation, and ensure timely delivery of projects, maintaining a 95% client satisfaction rate.
- Applied SEO best practices and web performance optimization techniques, improving page load speeds by 50% and search engine rankings.

Education

Instituto Tecnológico Superior Benito Juárez

Sep 2008 - Mar 2013

Technologist, Systems Analysis

Quito, Ecuador
Instituto Tecnológico Superior Benito Juárez

Sep 2002 - Jul 2008

Basic Degree, Computing

Quito, Ecuador

Technical Skills

OpenAI
n8n
React
Next.js
Vue.js
TypeScript
JavaScript
React Native
HTML
CSS
Tailwind
Node
Python
Golang
PHP
GraphQL
PostgreSQL
MongoDB
MySQL
Neo4j
AWS
Docker
Kubernetes
Git
GitHub

Certifications and Training

Front End Architect Career

Platzi

2017 - 2025. Advanced frontend architecture, performance optimization, micro-frontends, state management, and testing strategies.
Frontend Career with React.js

Platzi

2019 - 2025. Advanced React patterns, hooks, custom hooks, state management, React Query, and testing with Jest and React Testing Library.
Frontend Career with Vue.js

Platzi

2019 - 2025. Vue.js 3 ecosystem, Vuex, Pinia, Composition API, SSR with Nuxt.js, and testing.

Languages and Interests

Languages

Spanish: Native
English: B1 - Professional Working Proficiency

Interests

Football
Athletics
Marching bands
Reading
Contributing to open source
Learning new technologies