I build scalable, high-performance web applications that drive real business impact.
Frontend architecture that drives user engagement.
I'm a Frontend & Fullstack Engineer with 8+ years of experience building scalable, high-performance web applications across e-commerce, healthcare, and marketplace platforms.
I focus on frontend architecture, rendering performance, and user experience, with a strong emphasis on products used by millions of users and impacting revenue at scale.
I am a strong advocate of clean code, testing, and continuous improvement, experienced in collaborating with cross-functional teams to deliver reliable, user-centric solutions.
Test my 1st laravel app
Career Journey
My professional evolution in software engineering
Senior Frontend Developer
Sam's Club
San Bruno, CA
Built large-scale e-commerce experiences focused on search, performance, and user engagement. Migrated to Next.js + GraphQL via GLASS framework.
Senior Frontend Developer
Cornershop by Uber
Remote (Mexico)
Built data-intensive applications handling complex UI state and scalability using React, evaluating Redux, MobX, Sass, and CSS-in-JS.
Senior Frontend Developer
Canada Drives
Remote (Vancouver, BC)
Worked on customer-facing features impacting conversion and engagement. Built 'Sell Your Car' flow end-to-end and integrated Salesforce Live Chat.
Senior Fullstack Developer
GlobalLogic
Remote (USA)
Developed healthcare platform features in a regulated environment using React, Node.js, TypeScript, and Redux. Mentored engineers and integrated APIs.
Senior Web Developer
Walmart Labs
San Bruno, CA
Contributed to Search, SEO, and Accessibility teams. Built responsive UI components using React and Redux while actively enhancing samsclub.com.
Fullstack Developer
Sibatel Comms Inc
Anaheim, CA
Developed fullstack applications using React, Node.js, Express, MongoDB, and Socket.io. Designed REST APIs and built reusable frontend components.
Technologies I use
Bridging the frontend and backend. What I use to build scalable production applications.
Frontend & UI
- Architected responsive, heavily interactive user interfaces mapping to complex application states using foundational React rendering strategies.
- Engineered large-scale Next.js applications featuring optimized React Server Components, efficient hydration, and comprehensive caching.
- Developed modular styling systems leveraging CSS-in-JS, Sass, and modern utility patterns ensuring perfect accessibility and cross-browser consistency.
Backend & APIs
- Developed high-performance Node.js backend services utilizing Express to serve scalable applications.
- Designed robust, schema-driven GraphQL APIs enabling efficient and flexible data fetching for modern frontend components.
- Constructed strictly tested REST API microservices featuring stateless architecture to handle demanding and sensitive datasets.
- Implemented real-time bidirectional communication features using Socket.io across operational tools.
Tooling & Architecture
- Enforced rigorous TypeScript adoption across hundreds of files, massively reducing technical debt and runtime errors.
- Achieved near 100% test coverage using React Testing Library and Jest, validating isolated components and critical workflows.
- Constructed reliable deployment pipelines via Jenkins automating CI/CD build integrity and artifact releases.
- Mentored teams in Agile methodologies prioritizing clean code, continuous improvement, and deep cross-functional collaboration.
Frontend & UI
- Architected responsive, heavily interactive user interfaces mapping to complex application states using foundational React rendering strategies.
- Engineered large-scale Next.js applications featuring optimized React Server Components, efficient hydration, and comprehensive caching.
- Developed modular styling systems leveraging CSS-in-JS, Sass, and modern utility patterns ensuring perfect accessibility and cross-browser consistency.
The Hive
A swarm of technologies, tools, and methodologies I leverage to build robust software systems.
Where I've Left a Mark
Crafting high-performance web applications that drive real business value. Highlighting engineering decisions and the measurable impact they delivered.
Sam's Club
- Migrated legacy React/Redux to Next.js + GraphQL
- Re-architected rendering with SSR
- Built modular systems for filters and product cards
- Introduced AI-powered ranking and personalization
- Optimized performance for large datasets
Result: Massive performance gains and revenue impact
Cornershop
- Built data-intensive applications
- Designed scalable React systems
- Improved usability for operational workflows
Result: Faster and more efficient operations
Canada Drives
- Improved conversion flows
- Built Sell Your Car experience
- Integrated real-time chat
Result: Increased conversion and engagement
Bright Health
- Built healthcare platform systems
- Developed fullstack features and integrations
- Collaborated across teams
Result: Reliable and scalable systems
Walmart Labs
- Enhanced e-commerce platform
- Improved performance and accessibility
- Worked across core systems
Result: Better experience at scale
Sibatel Comms Inc
- Built fullstack systems
- Developed APIs and real-time features
- Delivered modular frontend systems
Result: Strong engineering foundation
Contact
francisco.martinez.mu@gmail.com
GitHub
github.com/javiside (public)
linkedin.com/in/javiside
© 2026 Francisco Martinez. All rights reserved.