Luis Fernando
Romero Calero You can call me
Luis
Romero Calero
Luis
Luis Fernando
Romero Calero(You can call me Luis)
Romero Calero
Some Companies I Helped
Solution Architecture & Team Leadership
Software Engineering & UI Optimization
Platform Migration & Modernization
Technical Leadership & Strategy
Government Solutions & Consulting
Founding Engineering Team
Featured Work
Building tools that help people focus on what matters
Authentic Timer
A clean timer with no fluff—born from personal necessity
November 2024: While managing a sickness that limited my daily quality of life, I needed to manage my time carefully in the few hours I could focus. I searched for a clean, uncluttered timer that felt safe—but kept jumping between apps instead of having one productivity hub.
That's when I conceived an "authentic timer"—helping me prepare focused sessions of 25, 30, 45, or 50 minutes to tackle books, emails, paperwork, with everything listed and timeboxed.
8 months later: After collecting feedback and studying productivity, the nervous system, and ADHD, it became something I was proud to share with the world.
Rosemary.js
Open-source JavaScript library published on npm. Simplifying complex development workflows with elegant solutions.
Professional Experience
14+ years of technical leadership across major corporations
Senior Frontend Developer
Led UI development for mission-critical fleet management and runway optimization system. Conducted comprehensive UI audits and presented improvements to management.
Technologies
Key Achievements
- Optimized aircraft scheduling and route planning systems
- Presented UI audits to management with approval
- Enhanced system efficiency and user experience
Technical Lead (Fullstack)
Led the Navify marketplace migration from Angular to Next.js. Delivered PoC as blueprint for migration and coordinated with team members.
Technologies
Key Achievements
- Delivered migration PoC blueprint
- Coordinated team through agile methodologies
- Project on track for 2025 release
Solution Architect
Enhanced internal supply chain web applications across Asia, EMEA, and North America. Supervised and mentored front-end team members.
Technologies
Key Achievements
- Successful launch in several Asian countries by July 2022
- Harmonized UI experiences across EMEA and North America
- Mentored front-end team members
Senior Software Engineer
Led migration of partner portal UI from PERL templates to modern Vue.js solution. Conducted reverse engineering of legacy code.
Technologies
Key Achievements
- Successfully migrated legacy PERL to Vue.js
- Contributed to new partner portal release
- Effective stakeholder communication
Senior Frontend Developer
Collaborated with major companies across diverse industries including fintech, government, and healthcare.
Technologies
Key Achievements
- Deloitte: Led governmental greenfield project (React, Node.js, Neo4J)
- ClearBank: Developed greenfield banking platform (Vue.js)
- Tata/Verizon: Created e-commerce prototypes and Node.js microservices
Beyond Code
Software Engineering
With 14+ years of experience, I've worked across diverse industries from aviation to fintech. My expertise spans technical leadership, solution architecture, and full-stack development. I specialize in modernizing legacy systems and building scalable applications.
Core Technologies
Industries
Let's Connect
Currently available for freelance projects and interesting opportunities. Let's build something meaningful together.