Engineering products that scale to millions of users.
Senior Fullstack Developer with 5+ years building high-impact products at Telefónica, startups, and agencies — from pixel-perfect frontends to robust backend architectures.
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Years of Experience
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Monthly Users Reached
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Projects Delivered
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Countries Worked In
Trusted by founders & CTOs
Tech Stack
Products that ship, scale, and matter.
From enterprise platforms at Telefónica to indie products — here's a selection of work I'm proud of.
Global Streaming Community
A groundbreaking platform connecting musicians with global audiences. Built with Next.js, Spring Boot, and PostgreSQL, the system enables artists to promote their tracks, analyze engagement, and grow their reach. Hosted on DigitalOcean, the project also includes a browser extension to automate playback and engagement.
Movistar Prepaid Packages Col
A high-performance platform designed to efficiently manage Movistar's prepaid packages, serving over 1 million monthly users. The platform enables users to seamlessly check, purchase, and manage data, minutes, and SMS packages. The project included a full migration from React to Next.js, enhancing performance and user experience. The frontend interacts with robust backend services built in Spring Boot and C#, ensuring real-time synchronization with Movistar's internal systems. Additionally, the platform is fully mapped in Google Analytics for detailed monitoring of user behavior, enabling data-driven strategic decisions.
Concentrése Movistar Prepaid Col
An interactive experience developed as part of a promotional campaign for Movistar Prepaid Colombia, aimed at attracting new customers and engaging existing ones. The game challenges users to match all pairs of cards in the shortest time possible to compete for an iPhone. Built with Next.js, the platform delivers optimal performance and a seamless user experience. The interface was thoughtfully designed to be mobile-friendly and visually engaging. The solution is hosted on Movistar's reliable infrastructure and fully integrated with Google Analytics to track performance and user engagement.
JJ Security
A corporate website for JJ Security, a security company in Cali, Colombia. Beyond the initial Next.js development, a sophisticated SEO strategy combined with AI for content generation was implemented. This initiative successfully grew organic leads from nearly zero to over 100 per month, transforming a simple landing page and blog into the company's primary client acquisition channel.
What people say about working with me.
5 professionals have shared their experience working with me
Joan, excellent work! Thank you for taking on challenges with the best attitude and for believing that everything is possible 🙌🏽 Your motivation within the team inspires us to improve and grow. You are amazing 👊🏼 Joa…
Grace Villaquiran
Product Owner - Telefónica Colombia
I want to express my heartfelt congratulations for the excellent work done in developing our website. Your dedication, professionalism, and attention to detail have exceeded our expectations. Every aspect of the design a…
William Viera
CEO - Global Streaming Community
Joan! I acknowledge the great work you have contributed to the team. Every challenge that comes your way has been handled and solved seamlessly. You have demonstrated remarkable professionalism and a strong sense of owne…
Juan Ballesteros
Senior Developer - Telefónica Colombia
Working with you has been an exceptional experience. The websites for Jurídicos Asociados and Abogados Cali exceeded all our expectations, combining professional design with flawless functionality. Thanks to your dedicat…
Jorge Cediel
Lawyer - Jurídicos Asociados
Joan is an exceptional professional who has transformed our online presence. The JJ Security website is now a powerful marketing tool that reflects our mission and values. His user-centered approach and ability to transl…
Jairo Jimenez
Owner - JJ Security Group
Joan, excellent work! Thank you for taking on challenges with the best attitude and for believing that everything is possible 🙌🏽 Your motivation within the team inspires us to improve and grow. You are amazing 👊🏼 Joa…
Grace Villaquiran
Product Owner - Telefónica Colombia
I want to express my heartfelt congratulations for the excellent work done in developing our website. Your dedication, professionalism, and attention to detail have exceeded our expectations. Every aspect of the design a…
William Viera
CEO - Global Streaming Community
Joan! I acknowledge the great work you have contributed to the team. Every challenge that comes your way has been handled and solved seamlessly. You have demonstrated remarkable professionalism and a strong sense of owne…
Juan Ballesteros
Senior Developer - Telefónica Colombia
Working with you has been an exceptional experience. The websites for Jurídicos Asociados and Abogados Cali exceeded all our expectations, combining professional design with flawless functionality. Thanks to your dedicat…
Jorge Cediel
Lawyer - Jurídicos Asociados
Joan is an exceptional professional who has transformed our online presence. The JJ Security website is now a powerful marketing tool that reflects our mission and values. His user-centered approach and ability to transl…
Jairo Jimenez
Owner - JJ Security Group
The person behind the code.
Joan Sebastian Oviedo
Senior Fullstack Developer
Cali, Colombia
"I'm Joan Oviedo - a skilled web developer crafting impactful digital experiences from Cali, Colombia."
Hey there! I'm Joan Oviedo, a freelance web developer based in Cali, Colombia. With over 5 years of experience, I specialize in building dynamic and user-centered websites that leave a lasting impression. My expertise includes React, Next.js, and other modern technologies to bring your digital vision to life.
From sleek portfolios to robust applications, I ensure to exceed client expectations by delivering responsive, SEO-friendly, and high-performing websites. I prioritize understanding your goals to create solutions tailored to your needs.
Living in Cali, I draw inspiration from its vibrant culture and dynamic tech scene. Let's collaborate and bring your ideas to life through exceptional digital experiences!
Where I've built real impact.
5+ years across enterprise, startups, and freelance — from Telefónica's 1M-user platforms to independent product launches.
Telefónica Colombia (through Stefanini, DISC IT, and VASS)
INDRA - ENAIRE
Prevalentware SAS
Grupo AFL
GEMDA
El Roble
Tools I use to build great things.
Here, I showcase the tools and programming languages I work with. From React to TypeScript, each skill reflects my ability to deliver robust and dynamic digital solutions.
Cursor
AI pair codingClaude Code
Code assistantN8N
WorkflowsMCP
Tool protocolRAG
LLM pipelinesAI Agents
IntegrationNext.js
Daily driverReact
5+ yearsTypeScript
PreferredReact Native
Mobile appsTailwind CSS
All projectsGraphQL
API queriesSpring Boot
EnterpriseNode.js
APIs & scripts.NET Core
REST servicesPython
AI & automationAWS
EC2 · S3 · RDSAzure
Teams & CI/CDDocker
ContainersKubernetes
OrchestrationGitHub Actions
CI/CD pipelinesGit
Every dayPostgreSQL
Production DBsMySQL
OLTPOracle
Enterprise DBPlaywright
E2E testsJest
Unit testsVitest
Fast unit testsSonarQube
Code qualityTDD
Test-firstBDD/Gherkin
Gherkin specsAgile/Scrum
Team process32 skills across 5 domains · Always learning
Latest Articles
Frontend & Backend
Patrones de arquitectura para proyectos escalables con Next.js y App Router
Jan 1, 1970
by Joan Sebastian Oviedo
DevOps & Buenas Prácticas
Design Docs: La Guía Definitiva para Vibe Coding y Sinergia con IA
Jun 18, 2025
by Joan Sebastian Oviedo
Arquitectura de software
Microfrontends: La Guía para Descomponer tu Frontend con Module Federation
Jun 18, 2025
by Joan Sebastian Oviedo
Arquitectura de software
Nginx: El Secreto de su Rendimiento y su Rol Esencial en Docker y Kubernetes
Jun 11, 2025
by Joan Sebastian Oviedo