Sebas Velasquez
@sebasvelasquez
Frontend Engineer specializing in React, design systems, and accessible UI at scale.
ColombiaWhat I'm looking for
I’m a Frontend Engineer with 5+ years of experience building production-grade React applications, translating UI/UX into pixel-accurate, maintainable code. I focus on reusable component libraries and design system implementations that keep products stable as they grow.
At Blossom (2022–Present), I built and maintained large-scale React apps in TypeScript and achieved an error rate below 15% across deployments. I improved client-facing stability by 20% through reusable component libraries, applied WCAG accessibility standards (semantic HTML, ARIA, keyboard navigation), and reduced delivery and deployment times by 10% by integrating GraphQL and REST APIs.
I also strengthened performance and reliability as a Frontend Developer at Experis Manpower (2021–2022) by reducing client-reported errors by 15% and improving UX by up to 20%. Across roles, I’ve managed npm dependencies, release practices with Semantic Versioning, GitLab CI/CD pipelines, and collaborative Git workflows, while enforcing clean code and testing standards with unit/component/E2E tests.
Experience
Work history, roles, and key accomplishments
Middle Developer
Blossom
Jan 2022 - Present (4 years 3 months)
Built and maintained large-scale production React applications with TypeScript, keeping error rates below 15% across deployments. Delivered pixel-accurate responsive UIs from UI/UX designs, improved client stability by 20%, applied WCAG accessibility across components, and integrated REST/GraphQL to reduce delivery and deployment time by 10%.
Frontend Developer
Experis Manpower
Jan 2021 - Jan 2022 (1 year)
Maintained and optimized React web applications, reducing client-reported errors by 15% through systematic debugging and performance improvements. Built responsive, accessible screens and workflows from design specifications and improved UX by up to 20%, while managing npm dependency upgrades for compatibility and security.
Full Stack Developer
Coxti
Jan 2020 - Jan 2021 (1 year)
Created reusable, scalable UI components with consistent design language, improving system stability by 15%. Implemented centralized state management to boost team development performance by 20%, and optimized frontend build configuration and delivery pipeline to reduce build times and improve release reliability.
Full Stack Developer
Kommit
Jan 2019 - Jan 2020 (1 year)
Developed and maintained frontend systems focused on performance and scalability, supporting collaborative Git workflows. Improved maintainability and delivery readiness through ongoing front-end iteration and team-aligned version control practices.
Education
Degrees, certifications, and relevant coursework
Ministerio TIC Colombia
AWS Cloud Architecture (Basic Level), Cloud Architecture
Completed a basic-level Cloud Architecture on AWS certification through Ministerio TIC Colombia in August 2025.
Universidad de Caldas
Bachelor of Systems and Computer Engineering, Systems and Computer Engineering
Bachelor of Systems and Computer Engineering from Universidad de Caldas (Colombia), completed in 2021.
Tech stack
Software and tools used professionally
Availability
Location
ColombiaAuthorized to work in
Portfolio
jsebvel-portafolio.vercel.appJob categories
Skills
Interested in hiring Sebas?
You can contact Sebas and 90k+ other talented remote workers on Himalayas.
Message SebasFind your dream job
Sign up now and join over 100,000 remote workers who receive personalized job alerts, curated job matches, and more for free!
