Ariel Itzli Molina Sánchez
Crafting scalable digital platforms with the resilience of obsidian and the precision of code.
I lead frontend squads and architect micro-frontend platforms that scale — currently powering $100M+ USD in monthly transaction volume at EFEX.
I'm a Staff Frontend Engineer with 9+ years of experience building modular, scalable UI platforms for fintech and enterprise environments. My work spans frontend architecture, design systems, and developer experience (DX).
At EFEX, I lead the Frontend Squad and own the technical transformation from monolithic to micro-frontend architecture using Webpack Module Federation and Nx — growing the platform from $25M to $100M+ USD in monthly transaction volume and reducing time-to-market by 70%. I design multi-package design systems (MUI + Style Dictionary) and build CI/CD automation tooling.
My passion is building autonomous systems that empower teams — not just writing good code.
"My passion is building autonomous systems that empower teams — not just writing good code."
Where I've built
Staff Frontend Engineer
Lead the Frontend Squad and own the technical transformation from monolithic to micro-frontend architecture, supporting $100M+ USD in monthly transaction volume.
- Architected and led migration to micro-frontends using Webpack Module Federation and Nx, reducing time-to-market by 70%
- Designed and implemented EFEX's multi-package Design System powered by MUI and Style Dictionary, establishing design tokens and component libraries across platforms
- Built Mock Service infrastructure that decouples frontend demos from backend dependencies, eliminating demo instability for sales presentations
- Established technical roadmap to scale frontend team from 3 to 8+ engineers, including hiring strategy, onboarding systems, and architectural guidelines
- Defined coding standards, architectural patterns (adapter/repository), and review protocols adopted across all frontend projects
- Created CI/CD automation tools using custom CLIs and GitHub Actions for production releases, branching, semantic versioning, and changelog generation
Frontend Tech Lead & Architect
Architected the microfrontend-based platform and led frontend infrastructure, design systems, and developer tooling at EFEX.
- Architected and standardized the entire frontend infrastructure using Nx and Module Federation
- Built internal libraries for design tokens, theming, components, HTTP handling, and error management
- Developed an internal CLI to automate changelogs, QA, releases, and branching workflows
- Led cross-team architecture decisions, documentation efforts, and code reviews
- Introduced Storybook, Vitest, and GitHub Actions for improved testing and DX
Senior Frontend Developer
Developed and maintained scalable interfaces and internal tooling across EFEX platforms. Focused on UI quality, reusable code, and developer efficiency.
- Helped build EFEX's shared component library from scratch
- Contributed to the redesign and optimization of major application flows including payments, onboarding, and user management
- Implemented role-based access controls and views for user management
- Laid the groundwork for internal tools that evolved into company-wide CLI solutions
Senior Frontend Engineer
Contributed to two frontend verticals (Advertiser Dashboard and Customer Platform) under a shared architecture. Focused on modularity, scalability, and UX consistency.
- Built a visual analytics dashboard with complex data visualizations for advertisers
- Developed role-based management views and improved onboarding experiences
- Delivered reusable components and frontend utilities across teams
- Acted as liaison between product and engineering groups to align technical priorities with business needs
Tech Lead / Senior Frontend Developer
Led frontend development for enterprise-grade financial applications, building from scratch and supporting cross-team design system adoption.
- Developed and implemented a complete product from scratch, integrating backend via REST API
- Created a marketplace to unify products, services, and documents with role-based search and filter capabilities
- Developed and managed the design system project, supporting customer and development teams
- Built a project to centralize cross-departmental information, improving accessibility for team members
Frontend Developer
Developed a full product from scratch with encryption and sensitive data handling for financial enterprise clients.
- Developed a complete product from scratch with encryption/decryption of sensitive data using CryptoJS
- Built application with encrypted login, in-view file edition (rotate, scale, zoom), and calendar functionality
- Provided support for pages built with Next.js
Chief User Experience Officer
Led UX strategy and frontend architecture decisions for the platform, overseeing the complete user experience from onboarding to service delivery.
- Led UX strategy and made corrections and recommendations to improve UX flow across the entire product
- Created an alternate control panel for administrators
- Managed payment processes using Stripe
Web Frontend Developer
Developed an application from scratch for expert-client interactions, with complex onboarding flows, search, and real-time video communication.
- Built responsive SPAs with complex onboarding flows for multiple user types
- Implemented complex search filters and managed service requests, acceptances, rejections, and reschedules
- Integrated real-time video chat functionality using OpenTok with date/time controls
Tech Lead / Senior Front End Developer
Led frontend efforts for multiple e-commerce stores, implementing scalable workflows and project templates.
- Established standards for project templating and Git workflows including commit structure and naming conventions
- Led development of Shopify projects from scratch, tailoring each store to client-specific requirements
- Fixed and developed missing functionalities in VTEX-based stores
Development Manager & Frontend Developer
Early career role managing development workflows and building client-facing web projects.
- Led project planning and client communication for new software initiatives
- Developed internal tools to support business operations
- Gathered and analyzed requirements to deliver tailored solutions
Tools of the trade
Computer Systems Engineering
Also studied Computer Systems Engineering at Escuela Superior de Cómputo (ESCOM — IPN).