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Iván Rodríguez Calleja

Senior Frontend Engineer | React, TypeScript & Product-Focused UI/UX
Residence:
Spain
City:
Barcelona
Age:
29
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Spanish
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English (B2)
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Introduction
I’m Iván Rodríguez Calleja, a software engineer with nearly a decade of experience building impactful products in fast-paced startup environments. I specialize in leading frontend architecture and shaping scalable design systems that prioritize user experience and simplicity. Throughout my career, I’ve collaborated closely with designers and product managers to create thoughtful solutions that solve real problems — from rich text editors and interactive UIs to AI-powered features — especially for users and businesses with limited resources. My own experience running technical blogs and contributing to open source has given me a deep empathy for content creators and the tools they rely on. What drives me is a strong sense of ownership and a commitment to quality. I focus on the details that make an experience seamless and reliable, always considering edge cases and striving for polish. I thrive in teams that value excellence and collaboration as much as delivering results.
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Years Experience
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My Skills

Core Technologies
  • React, TypeScript, JavaScript (ES6+)
  • Node.js, GraphQL , REST APIs
  • HTML5, CSS3, CSS Modules, Sass
  • Radix UI, Design Tokens, Storybook
  • Webpack, Vite, Babel
Frontend Specialties
  • Design Systems — creation, evolution, and governance
  • Performance optimization (lazy loading, code splitting, rendering efficiency)
  • Responsive design & mobile-first development
  • AI-assisted workflows & recommendation features
  • Interactive UIs
  • Rich Text Editors
  • Accessibility (WCAG) & cross-browser compatibility
Testing & Quality
  • Jest, React Testing Library, Playwright
  • Unit testing, Integration testing, E2E testing
  • CI/CD pipelines (GitHub Actions, Azure DevOps)
Collaboration & Process
  • Remote-first & async communication (Slack, Notion, Figma, Trello, Jira)
  • Code reviews, mentoring, and cross-functional teamwork
  • Agile / Scrum workflows
Backend & Infrastructure (supporting skills)
  • Node.js + Express
  • .NEW Core & Golang
  • MongoDB, PostgreSQL
  • Azure, Google Cloud Platform
  • Kubernetes, Docker
  • Microservices architecture, monorepos (Turborepo, Nx)