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Juan Guerrero
Senior Frontend Software Engineer specializing in React and Angular
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About
Frontend engineer with experience building specialized browser-based interfaces for asset management and machine service recommendation systems. Stands out for creating custom UI components like a calendar from scratch in pure JS/TS and CSS, while applying permission-based architecture, design-system constraints, and functional React/Redux patterns.
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Key Strengths
- Built complex browser UIs for asset management and machine service recommendation workflows
- Designed role/permission-based interfaces for multi-step recommendation creation and acceptance
- Implemented custom calendar UI from scratch without a library
- Strong DOM/layout problem-solving for dynamic popover positioning
- Improved UX with lazy-loaded event details and placeholders
- Balanced advanced grid customization with filtering and sorting requirements
- Uses functional programming patterns in React/Redux component and logic design
- Collaborates with product owners to identify user needs and validate UI success
- end-to-end ownership of customer asset/invoice/order management platform
- micro-frontend architecture design and integration
- React + TypeScript frontend architecture
- performance optimization with lazy loading and deferred large-table loading
- testing strategy with unit and Playwright E2E integrated into GitLab pipelines
- cross-functional API contract definition with backend using Swagger
- internationalized date/time UX across regions and languages
- product and client collaboration beyond pure frontend implementation
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