Open to opportunities

John Fredy Morales

@johnfredymorales

I build scalable React applications and lead high-performing frontend engineering teams.

I've built and scaled React and TypeScript applications for Chemical Safety International, Sofka Technologies, and Hibot Chat, including weather, healthcare, and real-time commodity data platforms.

At Sofka Technologies, I led six engineers delivering healthcare applications for more than 50,000 users, raised test coverage from 45% to 85%, and improved frontend performance by 25%. At Chemical Safety International, I support a weather data platform handling 10,000+ daily API requests, resolved 25+ production issues, and reduced user-reported bugs by 40%.

I enjoy building reusable component libraries, improving performance and reliability, and partnering closely with backend teams on REST, GraphQL, caching, and real-time integrations.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Developer

Current

Chemical Safety International

Dec 2022 - Present (3 years 8 months)

Built and maintained a weather data platform frontend using React and TypeScript, consuming APIs handling 10,000+ daily requests. Resolved 25+ production issues, reducing user-reported bugs by 40% and integrating Sentry for real-time monitoring.

React TypeScript Sentry Redis Jest API Integration

Senior Frontend Developer

Hibot Chat

Jul 2018 - Nov 2022 (4 years 4 months)

Built a commodity dashboard using React and TypeScript, serving 1,000+ users with real-time data visualization. Reduced load time by 30% and implemented WebSocket-based real-time updates via Action Cable.

React TypeScript WebSockets Storybook Performance Optimization

Lead Frontend Developer

Sofka Technologies

Jul 2018 - Nov 2022 (4 years 4 months)

Led a team of 6 engineers architecting frontend solutions in React for healthcare applications serving 50,000+ users. Increased test coverage from 45% to 85% with TDD and improved performance by 25% through code splitting and lazy loading.

React TypeScript Jest REST APIs Grape JBuilder

Frontend/Backend Developer

CREARESOFT

Mar 2017 - Jun 2018 (1 year 3 months)

Built REST APIs consumed by Vue and Angular frontend applications, ensuring smooth integration. Developed backend services with Ruby on Rails, Sinatra, and PostgreSQL, improving performance by 30% through query optimization and Redis caching.

Angular Ruby on Rails Sinatra PostgreSQL Redis REST APIs Jest RSpec