Juan Rosero

Front End Engineer

Ecuadorian mountains with a light fog

Hi! I'm Juan

a Front End Engineer from the mountains

Born in the Andes mountains of Ecuador and now based in Europe, I'm a Full Stack Developer with 7+ years of experience building scalable web applications and leading development teams. I specialize in React, TypeScript, and GraphQL with a strong design mindset, focusing on creating user-centered solutions that bring real value to businesses. Currently serving as Squad Lead at Engine AI, I drive technical decisions while mentoring team members to deliver complex features that bridge data and insights.

Juan Rosero's profile photo

Location: London, UK

Email: juan@rosero.dev

Technical Skills

Frontend Development
React TypeScript HTML5 CSS3 GraphQL Astro
Backend Development
Node.js NestJS PostgreSQL MongoDB MySQL Elasticsearch
Tools and Technologies
Git Docker Azure AWS Firebase Jest Vite Storybook

Professional Experience

Senior Full Stack Developer & Squad Lead

Engine AI • London

September 2020 - Present

Demonstrated rapid career progression from Junior Developer to Squad Lead over 4+ years at a data insights startup specializing in visualization platforms. Led the development of core platform architecture using React, TypeScript, PostgreSQL, and GraphQL, enabling clients to transform data into actionable insights. Built essential product features that drove significant business value through client customization capabilities and rapid prototyping for new AI solutions. Managed a development squad while maintaining hands-on technical contributions across full-stack feature delivery.

Technologies Used:
React TypeScript PostgreSQL GraphQL Docker Azure

Full Stack Developer

101 Grados • Quito

July 2020 - September 2020

Worked as a Full Stack Developer for a leading marketing company in Ecuador, providing technical solutions for major brands including General Motors and Multicines. Developed custom platforms using a diverse tech stack including React, MySQL, PostgreSQL, NodeJS with NestJS, and Elasticsearch. Focused on creating scalable solutions that could handle thousands of users while meeting specific client performance requirements. Left the position to pursue the opportunity to move to Portugal with Engine AI.

Technologies Used:
React Node.js NestJS PostgreSQL Elasticsearch

Frontend Developer

Jobsity • Quito

September 2018 - December 2019

Started as part of Jobsity's competitive JSchool program, which I accessed through a hackathon and completed with merits, leading to a full-time Front End Developer position. Worked for a software development near-shoring startup that connects Latin American talent with US clients. Focused on React development and component library architecture for internal and external platforms. Left the position in preparation for the planned move to Portugal with Engine AI in early 2020.

Technologies Used:
React Storybook NestJS TypeScript

Full Stack Developer

Ecuador House Rentals • Quito

June 2016 - March 2018

Worked as a Full Stack Developer for a property listing platform while still in university, after being approached based on academic performance to develop the complete website from scratch. Collaborated with a colleague to design and build the entire platform over the course of a year, gaining foundational experience in full-stack development and business requirements. Successfully launched the platform in 2017 and continued supporting it through 2020 when the business was discontinued by the owners.

Technologies Used:
MongoDB Polymer Node.js Material UI Heroku

Key Strengths

Technical leadership

Proven ability to lead development teams while maintaining hands-on technical contribution and code quality standards.

Design-Focused Development

Strong emphasis on user experience and visual design, ensuring technical solutions align with user needs and business objectives.

Cross-Cultural Communication

Experience working across international teams and clients, with strong communication skills for technical and non-technical stakeholders.

Problem-Solving

Solution-oriented approach to challenges, focusing on practical outcomes rather than obstacles.

Adaptability

Successfully navigated multiple technology stacks and business domains, from marketing platforms to financial data insights.

Education & Learning

Electronics and Telecommunications Engineering

Universidad de las Américas • Quito

July 2012 - February 2018

  • Full merit scholarship awarded by the State
  • Thesis: Bottle image classification system using Convolutional Neural Networks
  • Equivalent to Masters in Computer Science (European standard)

Continuous Learning

Design Thinking, the Ultimate Guide

Interaction Design Foundation • June 2023

Languages

Spanish (Native) English (Advanced) Portuguese (Mid-Advanced)

Get in Touch!

If you have any questions or would like to collaborate on a project, please feel free to reach out to me via email.

Get In Touch Get My Resume in PDF