Diego is available for hire
Hire DiegoDiego Fortes
Verified Expert in Engineering
Web Development Developer
Buenos Aires, Argentina
Toptal member since January 4, 2016
Bio
Diego is a software engineer with 15+ years of experience building production web applications. His experience spans founding a startup, enterprise technical leadership, open source contributions, and engineering at scale. An expert in React, Diego excels at creating full-stack applications using Next.js, TypeScript, Node.js, and cloud infrastructure. He combines hands-on product engineering, modern developer tooling, and AI workflows to deliver reliable software and polished user experiences.
Portfolio
HoundDog.ai
React, Tailwind UI, Remix, TypeScript, Shadcn UI, Application State Management...
Atlas
React, Vite, CSS, Application State Management, TypeScript, Cypress...
Curology
TypeScript, React, MobX, Responsive Web Design (RWD), ECMAScript (ES6)...
Experience
- JavaScript - 15 years
- Web Development - 15 years
- Front-end Development - 15 years
- TypeScript - 12 years
- React - 10 years
- Figma - 5 years
- AI-assisted Development - 3 years
- Next.js - 2 years
Preferred Environment
Git, MacOS, Cursor AI, AI-assisted Development
The most amazing...
...app I've built was a full-stack React and Node.js app with real-time Google Maps integration and a custom UI component suite.
Work Experience
Co-founder & Staff Engineer
2024 - 2026
HoundDog.ai
- Built the initial HoundDog.ai SaaS MVP in Next.js as the sole front-end developer, then ported the application to Remix using TypeScript, shadcn/ui, and Tailwind CSS.
- Implemented atomic state management with Jotai and multi-tenant authentication using PropelAuth.
- Improved core scanning infrastructure through system-level enhancements to a Rust-based AST scanner.
- Extended back-end capabilities by designing and building Django REST APIs for full-stack product features.
- Worked directly with the CTO (a former Meta and Amazon engineering lead), who provided a strong professional reference.
Technologies: React, Tailwind UI, Remix, TypeScript, Shadcn UI, Application State Management, Django, Tailwind CSS, Web, CSS3, HTML5, JavaScript, Git, Node.js, CSS, Responsive Web Design (RWD), Figma, Next.js, User Interface (UI), Vite, Sentry, Design Systems, UI Components, APIs, Front-end, GitHub, HTML, Visual Studio Code (VS Code), MacOS, Responsive Design, UI Design, UX Design, Artificial Intelligence (AI), Full-stack Development, Python, React Router, AI Tools, RESTFul APIs, Google Cloud Platform (GCP), API Integration, AI Agents, Web Development, Full-stack, Agentic AI, Claude Code, Codex, Architecture, Software Architecture, Front-end Development, Docker, Server-side Rendering (SSR), Single Sign-on (SSO), REST APIs, Responsive UI, AI-assisted Development, AI-generated Code, Supabase, Leadership, Agentic Coding, Systems Design, Technical Leadership, Pixel Perfect, Open Source, Accessibility, Multilingual Websites, Web Accessibility, Web Content Accessibility Guidelines (WCAG), Prototyping, SaaS, Dynamic Websites
Senior Front-end Engineer
2022 - 2024
Atlas
- Modernized the front-end build pipeline by migrating the core platform from Create React App to Vite, reducing build and test times from minutes to seconds while removing legacy security issues.
- Led the transition to TypeScript and helped establish a type-safe codebase.
- Reworked unsafe Redux state management into a more predictable atomic architecture with Jotai.
- Improved engineering standards by configuring ESLint, Prettier, and TypeScript tooling.
- Added automated end-to-end test coverage with Cypress.
- Mentored junior engineers on React, TypeScript, front-end architecture, and code quality practices.
- Contributed to staff-level architecture decisions involving technical feasibility, database schemas, and user interfaces.
Technologies: React, Vite, CSS, Application State Management, TypeScript, Cypress, Tailwind CSS, Web, CSS3, HTML5, JavaScript, Git, Node.js, Responsive Web Design (RWD), Figma, User Interface (UI), Tailwind UI, Design Systems, UI Components, APIs, Front-end, GitHub, HTML, Visual Studio Code (VS Code), MacOS, Responsive Design, UI Design, UX Design, Artificial Intelligence (AI), Full-stack Development, Python, React Router, AI Tools, RESTFul APIs, Google Cloud Platform (GCP), API Integration, AI Agents, Web Development, Full-stack, Agentic AI, Claude Code, Codex, Architecture, Software Architecture, Healthcare, Front-end Development, Docker, Material UI, Server-side Rendering (SSR), REST APIs, Responsive UI, Zustand, AI-assisted Development, AI-generated Code, Leadership, Agentic Coding, Systems Design, Technical Leadership, Pixel Perfect, Accessibility, Multilingual Websites, Web Accessibility, Web Content Accessibility Guidelines (WCAG), Prototyping, SaaS, Dynamic Websites
Senior Front-end Engineer
2019 - 2022
Curology
- Led the migration of the core web platform from a legacy PHP architecture to a modern React stack using Gatsby and Emotion.
- Maintained and improved client-facing applications built with React, TypeScript, and MobX.
- Built features for internal administrative tools, improving operational workflows and interface efficiency.
- Migrated Radiance UI, Curology's open-source component library, to TypeScript.
- Used Storybook to document reusable components and scalable design patterns.
Technologies: TypeScript, React, MobX, Responsive Web Design (RWD), ECMAScript (ES6), JavaScript, Git, React Testing Library, Cypress, Lodash, Flexbox, Emotion Library, Figma, Contentful, HTML, Visual Studio Code (VS Code), MacOS, Content Management Systems (CMS), Responsive Design, Adobe Photoshop, Chai, Webpack, Mocha, SCSS, JSON, REST, NPM, Redis, Babel, Less, HTML5, Web, CSS3, Storybook, GitHub, Vue, Front-end, SQL, Amazon Web Services (AWS), APIs, Next.js, UI Components, Design Systems, User Interface (UI), User Experience (UX), Tailwind CSS, Node.js, CSS, Vite, Tailwind UI, Sentry, UI Design, UX Design, Full-stack Development, React Router, RESTFul APIs, API Integration, Web Development, Full-stack, Architecture, Software Architecture, Front-end Development, Docker, Material UI, REST APIs, Responsive UI, Zustand, Jest, Leadership, Systems Design, Technical Leadership, Pixel Perfect, Open Source, Accessibility, Web Accessibility, Web Content Accessibility Guidelines (WCAG), Prototyping, SaaS, Dynamic Websites
Senior Full-stack Engineer
2017 - 2019
Restoration Media
- Built and launched four full-stack web applications with admin panels using Angular, Node.js, Express, and MongoDB.
- Designed a unified authentication architecture with Passport.js and Google OAuth to support single sign-on across multiple platforms.
- Built a custom front-end asset pipeline with Gulp for EJS templates and LESS compilation.
- Established back-end test coverage using Mocha, Chai, Sinon, and Supertest, consistently maintaining more than 80% coverage.
- Integrated third-party services including Google DFP, AdButler, AWS S3, and SendGrid.
Technologies: Web, CSS3, HTML5, JavaScript, AngularJS, MongoDB, Express.js, Node.js, Responsive Web Design (RWD), ECMAScript (ES6), Git, React, Lodash, Flexbox, HTML, Visual Studio Code (VS Code), MacOS, Responsive Design, Mongoose, Adobe Photoshop, Webpack, JSON, NPM, Redis, Babel, GitHub, Front-end, SQL, Amazon Web Services (AWS), APIs, UI Components, Design Systems, Figma, User Interface (UI), User Experience (UX), PostgreSQL, TypeScript, CSS, UI Design, UX Design, Full-stack Development, React Router, RESTFul APIs, API Integration, Web Development, Full-stack, Architecture, Software Architecture, Front-end Development, REST APIs, Responsive UI, Systems Design, Pixel Perfect, Accessibility, Web Accessibility, SaaS, Dynamic Websites
Senior Front-end Engineer
2018 - 2018
iwoca
- Built a high-performance server-side rendered web platform using Gatsby, React, GraphQL, and Contentful CMS.
- Designed Contentful data models and structured GraphQL schemas, queries, and mutations for efficient content delivery.
- Implemented custom responsive interfaces with React and Stylus, optimizing rendering performance across device sizes.
Technologies: Gatsby, Web, CSS3, HTML5, JavaScript, Stylus, Contentful, GraphQL, React, Responsive Web Design (RWD), ECMAScript (ES6), Git, Flexbox, HTML, Visual Studio Code (VS Code), MacOS, Content Management Systems (CMS), Responsive Design, Adobe Photoshop, JSON, NPM, Babel, GitHub, Front-end, APIs, UI Components, Design Systems, User Interface (UI), User Experience (UX), Node.js, CSS, TypeScript, UI Design, UX Design, API Integration, Web Development, Front-end Development, REST APIs, Responsive UI, Pixel Perfect, Web Accessibility, SaaS, Dynamic Websites
Full-stack JavaScript Developer
2016 - 2017
Sellr
- Maintained and improved four full-stack web applications backed by Node.js, Express, MongoDB, and MySQL.
- Redesigned two core applications with custom responsive interfaces, replacing rigid framework-driven layouts.
- Built three hybrid mobile applications with AngularJS and Ionic for iPad and mobile phone form factors.
- Extended a React-based product discovery application with advanced listing, filtering, and client-side state management.
Technologies: Web, CSS3, HTML5, JavaScript, Ionic, Less, MEAN Stack, MongoDB, Express.js, Node.js, Redux, React, AngularJS, Responsive Web Design (RWD), ECMAScript (ES6), Git, Flexbox, HTML, Visual Studio Code (VS Code), MacOS, Responsive Design, Adobe Photoshop, JSON, NPM, Babel, GitHub, Front-end, SQL, APIs, UI Components, Design Systems, User Interface (UI), User Experience (UX), CSS, UI Design, UX Design, Bootstrap 3, RESTFul APIs, Angular, API Integration, Web Development, Full-stack, Front-end Development, REST APIs, Responsive UI, Systems Design, Pixel Perfect, SaaS, Dynamic Websites
Full-stack Engineer
2016 - 2017
CUPS App
- Modernized the front-end architecture by migrating the platform from React 0.14 to React 15.
- Built a lightweight CMS solution with an EJS template engine backed by structured JSON content models.
- Developed Node.js and Express infrastructure, including middleware, secure routes, and REST endpoints.
- Integrated Google Maps API features for location search, spatial querying, and proximity rendering.
- Designed a telemetry and analytics tracking engine using ES6+ and Babel.
Technologies: jQuery, Web, CSS3, HTML5, JavaScript, React, EJS, Babel, Express.js, Node.js, Responsive Web Design (RWD), ECMAScript (ES6), Git, Flexbox, HTML, Visual Studio Code (VS Code), MacOS, Responsive Design, Adobe Photoshop, JSON, NPM, Front-end, SQL, APIs, UI Components, Design Systems, User Interface (UI), User Experience (UX), CSS, GitHub, UI Design, UX Design, Bootstrap 3, Full-stack Development, RESTFul APIs, API Integration, Web Development, Full-stack, Front-end Development, REST APIs, Responsive UI, Systems Design, SaaS, Dynamic Websites
Front-end Engineer
2016 - 2016
PaidUp
- Led greenfield front-end development for a new web application using AngularJS and Browserify.
- Built a responsive, mobile-first interface with Materialize CSS and LESS.
- Helped modernize the product by contributing to the migration toward Vue.
Technologies: Web, CSS3, HTML5, JavaScript, Less, Responsive Design, Browserify, Node.js, AngularJS, Responsive Web Design (RWD), ECMAScript (ES6), Git, Flexbox, HTML, MacOS, JSON, NPM, Vue, Front-end, SQL, APIs, UI Components, Design Systems, User Interface (UI), User Experience (UX), CSS, GitHub, Visual Studio Code (VS Code), React, UI Design, UX Design, Bootstrap 3, RESTFul APIs, API Integration, Web Development, Front-end Development, Responsive UI, SaaS, Dynamic Websites
Front-end Engineer
2016 - 2016
PVBid
- Improved client-side runtime performance by analyzing AngularJS workflows and migrating critical interactions to lightweight JavaScript and jQuery.
- Modernized the application presentation layer with modular SASS and interactive jQuery components.
- Helped the team to improve performance with advanced Angular and jQuery techniques.
Technologies: jQuery, Web, CSS3, HTML5, JavaScript, Gulp, Sass, HTML, AngularJS, Responsive Web Design (RWD), Git, Flexbox, MacOS, Responsive Design, JSON, Front-end, APIs, Design Systems, User Interface (UI), User Experience (UX), CSS, GitHub, Visual Studio Code (VS Code), UI Design, UX Design, Grunt, RESTFul APIs, Angular, API Integration, Web Development, Front-end Development, Responsive UI, Systems Design, SaaS, Dynamic Websites
Front-end Developer
2016 - 2016
Listen360
- Converted high-fidelity Photoshop designs into production web interfaces with strong visual accuracy.
- Built customized interactive UI components by extending and styling third-party jQuery plugins.
- Developed a responsive, mobile-first layout using SASS.
- Improved platform interactivity with modular JavaScript and jQuery.
Technologies: Knockout (Knockout.js), jQuery, Web, CSS3, HTML5, JavaScript, Sass, HTML, Responsive Web Design (RWD), Git, Flexbox, MacOS, Responsive Design, JSON, Front-end, APIs, Design Systems, User Interface (UI), User Experience (UX), CSS, GitHub, Visual Studio Code (VS Code), UI Design, UX Design, Grunt, RESTFul APIs, API Integration, Web Development, Front-end Development, Responsive UI, SaaS, Dynamic Websites
Front-end Developer
2016 - 2016
DoubleNet Pay
- Refactored a legacy web platform by modularizing Backbone.js and Handlebars components.
- Built an automated Gulp pipeline for minification, concatenation, and cache-busting.
- Converted InVision prototypes into responsive interfaces with strong visual fidelity across device sizes.
Technologies: Web, CSS3, HTML5, JavaScript, Gulp, Backbone.js, Handlebars, Bootstrap, HTML, Responsive Web Design (RWD), Git, Flexbox, MacOS, Responsive Design, JSON, Front-end, APIs, Design Systems, User Interface (UI), User Experience (UX), CSS, GitHub, Visual Studio Code (VS Code), UI Design, UX Design, RESTFul APIs, API Integration, Web Development, Front-end Development, SaaS, Dynamic Websites
Front-end Engineer
2015 - 2015
Southapps
- Built and launched a cross-platform mobile application using Ionic and AngularJS.
- Developed and styled more than 30 application screens from high-fidelity UI/UX mockups.
- Created modular SASS styles for reusable, maintainable mobile interfaces.
Technologies: Web, CSS3, HTML5, JavaScript, Sass, Ionic, AngularUI, AngularJS, Responsive Web Design (RWD), HTML, Responsive Design, Front-end, APIs, User Interface (UI), User Experience (UX), Git, CSS, Design Systems, GitHub, Visual Studio Code (VS Code), MacOS, UI Design, UX Design, RESTFul APIs, Angular, API Integration, Web Development, Front-end Development, Systems Design, Dynamic Websites
Project Technical Lead & Senior Web Developer
2011 - 2015
ExxonMobil
- Led the technical direction of two enterprise initiatives: the global redesign of ExxonMobil's public web presence and the migration of a Java B2B platform to an Angular single-page application.
- Directed cross-functional development teams contracted from Deloitte, maintaining code quality, delivery milestones, and architecture standards for a platform processing millions of dollars in daily transactions.
- Designed and supported global corporate web applications, including an enterprise CMS migration from Documentum to Sitecore.
- Owned enterprise web infrastructure administration and integration across Akamai CDN, Google Search Appliance, and Webtrends analytics.
Technologies: jQuery, Web, CSS3, HTML5, JavaScript, Responsive Design, Java, C#, ASP.NET, Sass, AngularJS, Responsive Web Design (RWD), HTML, Content Management Systems (CMS), Front-end, SQL, APIs, User Interface (UI), User Experience (UX), Git, CSS, UI Design, UX Design, Full-stack Development, RESTFul APIs, Angular, API Integration, Web Development, Full-stack, Front-end Development, Leadership, Systems Design, Technical Leadership
Web Application Engineer
2011 - 2011
IBM
- Maintained and improved an enterprise J2EE web application within IBM's global procurement department.
- Built client-side features with vanilla JavaScript and Prototype.js to support front-end performance and cross-browser behavior.
- Implemented RESTful web services to integrate back-end business logic and internal data flows.
- Wrote SQL queries and managed persistence logic for IBM DB2 databases.
Technologies: JSX, jQuery, Web, CSS3, HTML5, JavaScript, SQL, Java, Prototype Framework, Responsive Web Design (RWD), HTML, Responsive Design, APIs, User Interface (UI), CSS, Front-end, UI Design, Full-stack Development, RESTFul APIs, Web Development, Full-stack, Front-end Development, Dynamic Websites
Full-stack Engineer
2010 - 2011
Dridco
- Built and optimized features for a high-traffic eCommerce web application using Java, Spring Framework, and Hibernate.
- Modernized front-end interactions with jQuery Tools and jQuery UI.
- Wrote SQL scripts to improve data structures, indexes, and storage behavior across Oracle and SQL Server environments.
- Collaborated with product and engineering teams to deliver full-stack features across back-end services and user interfaces.
Technologies: CSS, JSX, jQuery, Web, CSS3, HTML5, JavaScript, Hibernate, Spring MVC, Java, jQuery UI, HTML, APIs, Responsive Web Design (RWD), User Interface (UI), Front-end, Responsive Design, UI Design, Full-stack Development, RESTFul APIs, Web Development, Full-stack, Front-end Development, Dynamic Websites, Jakarta Server Pages (JSP)
Web Engineer
2009 - 2010
Globant
- Supported global enterprise digital platforms for EMC Corporation using Documentum.
- Built data-driven layouts with XSLT, semantic HTML, CSS, and JavaScript.
- Developed custom WordPress themes with modular CSS.
- Created accessible HTML and CSS assets for internet marketing campaigns with strong email-client compatibility.
Technologies: Web, CSS3, HTML5, JavaScript, Content Management Systems (CMS), WordPress, Adobe Photoshop, MySQL, PHP, CSS, HTML, APIs, Responsive Web Design (RWD), User Interface (UI), Front-end, UI Design, Web Development, Front-end Development, Dynamic Websites
Web Developer
2008 - 2009
Enexum
- Built accessible layouts and interactive user interfaces with HTML, CSS, and JavaScript.
- Debugged and resolved cross-browser compatibility issues across multiple web applications.
- Supported enterprise client work involving XSLT data transformations and server-side content delivery.
Technologies: Web, CSS3, HTML5, JavaScript, Adobe Photoshop, XSLT, XML, CSS, HTML, Responsive Web Design (RWD), User Interface (UI), Front-end, UI Design, Web Development, Front-end Development
Experience
Curology
https://curology.comI converted the Curology website from PHP to React using the Gatsby framework. I later converted this Gatsby JavaScript code to TypeScript. Also, I worked on several customer-facing and back-office web applications using React, MobX, and Radiance UI—the company's public component library—for which I helped develop several new components in TypeScript, React, and Storybook.
Radiance UI
https://github.com/curology/radiance-uiThe original author of this React UI component library used in Curology. Initial components were inside the main app repo in JavaScript, but for Radiance, I converted all to TypeScript, added enhancements, and expanded to more components. I mainly used Storybook, TypeScript, and React.
NoBS Apps
https://nobsapps.co/At NoBS Apps, I designed, built, and released three production mobile applications for iOS and Android: NoBS Fasting, NoBS Flappy, and NoBS Timers. These privacy-first apps work offline without accounts, advertising, tracking, or unnecessary cloud services. I am also developing custom SaaS products, including an appointment manager for doctors and an agenda and booking platform for service professionals such as manicurists and beauty salons. I own the complete product lifecycle, including product design, architecture, implementation, testing, deployment, and release.
Education
2003 - 2008
Bachelor's Degree in Information Systems Engineering
National Technological University - Buenos Aires, Argentina
Skills
Libraries/APIs
Node.js, Chai, React, jQuery, Flexbox, REST APIs, EJS, Emotion Library, Lodash, React Testing Library, React Router, jQuery UI, AngularUI, Handlebars, Backbone.js, MobX, Vue
Tools
Mocha, Stylus, Gulp, JSX, Webpack, Grunt, Babel, Browserify, Git, Figma, GitHub, Shadcn UI, Mongoose, Adobe Photoshop, Sentry, Claude Code, Codex, NPM
Languages
HTML, CSS, CSS3, Sass, HTML5, SCSS, JavaScript, ECMAScript (ES6), Less, TypeScript, SQL, GraphQL, Python, C#, Java, PHP, XML, XSLT
Frameworks
Bootstrap, Express.js, Ionic, Bootstrap 3, AngularJS, Next.js, Remix, Tailwind CSS, Redux, Jest, Django, Angular, Material UI, ASP.NET, Prototype Framework, Spring MVC, Hibernate, Knockout (Knockout.js), Cypress, Jakarta Server Pages (JSP)
Paradigms
REST, Responsive Web Design (RWD), UI Design, UX Design, MEAN Stack
Platforms
MacOS, Web, Visual Studio Code (VS Code), Google Cloud Platform (GCP), WordPress, Contentful, Amazon Web Services (AWS), Mobile, Docker
Storage
JSON, MongoDB, MySQL, Redis, PostgreSQL
Industry Expertise
Healthcare
Other
Responsive Design, Front-end, APIs, UI Components, Design Systems, User Interface (UI), User Experience (UX), Software Engineering, Programming, Vite, Tailwind UI, RESTFul APIs, API Integration, Web Development, Architecture, Software Architecture, Front-end Development, Responsive UI, Pixel Perfect, Prototyping, SaaS, Dynamic Websites, Application State Management, Artificial Intelligence (AI), Full-stack Development, AI Tools, AI Agents, Full-stack, Agentic AI, Server-side Rendering (SSR), Single Sign-on (SSO), Zustand, AI-assisted Development, AI-generated Code, Leadership, Agentic Coding, Systems Design, Technical Leadership, Open Source, Accessibility, Multilingual Websites, Web Accessibility, Web Content Accessibility Guidelines (WCAG), Content Management Systems (CMS), Storybook, Gatsby, Enzyme, Supabase, Cursor AI
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