
Katty Barroso
Verified Expert in Engineering
Software Developer
Valencia, Spain
Toptal member since June 5, 2024
Katty is a software engineer with 6+ years of experience building large-scale React/Redux applications, now extending into Web3 and AI. At Centrifuge, she integrates smart contracts with Ethers.js and Viem, builds transaction simulation flows with Tenderly, and architects CI/CD across Cloudflare Workers and Google Cloud. As a founding engineer on a consumer AI platform, she shipped the full stack solo, React, Node.js/Express, Supabase, with multi-provider AI across chat, image, video, and voice.
Portfolio
Experience
- React Native - 5 years
- JavaScript - 5 years
- Programming - 5 years
- React - 5 years
- React Query - 5 years
- Front-end - 5 years
- Redux - 5 years
- Web Development - 5 years
Preferred Environment
MacOS, Linux, Front-end
The most amazing...
...thing was shipping a consumer AI platform end-to-end as the sole founding engineer—full-stack front end and back end, and multi-provider AI integration.
Work Experience
Founder
Confidential
- Architected and shipped a full-stack consumer AI conversational platform end-to-end as the solo founding engineer, owning front end, back end, AI integration, payments, and deployment.
- Built the front end on React, Material UI v5, and Vite with a mobile-first responsive design, delivering a chat experience optimized for production performance.
- Designed and implemented a Node.js and Express API proxy that orchestrated traffic across multiple third-party AI providers, isolating each integration into its own service module.
- Built the back end on Supabase, deployed across Render as a static site and web service for production-grade availability.
- Integrated a multi-provider AI stack with modular separation: OpenRouter for LLM chat completions, xAI Grok for image generation and keyframe-to-motion video, and ElevenLabs for per-persona voice synthesis.
- Implemented payment infrastructure with Zen Payments and crypto rails, plus banking integration.
- Instrumented privacy-respecting product analytics with Plausible, replacing third-party tracking pixels and reducing the platform's data exposure surface.
React Developer
K-f Dev AG
- Architected and built a new full-stack application for tokenizing real-world assets, using TypeScript, React, and React Query, integrating a new SDK to interact with EVM-compatible chains.
- Integrated Tenderly's transaction simulation API into the core transaction flow, enabling users to preview gas costs and validate execution paths before committing on-chain.
- Designed and shipped a CI/CD pipeline leveraging Tenderly forks, Cloudflare Workers, GitHub Actions, and Google Cloud, reducing deployment friction and enabling per-PR preview environments.
- Integrated IPFS pinning into the new app to decentralize asset storage and remove reliance on centralized infrastructure.
- Maintained and extended the existing Polkadot UI and SDK, supporting cross-chain workflows across EVM and Substrate-based networks.
- Refactored and modernized legacy app components, improving consistency across the product surface and accelerating downstream feature delivery.
Software Engineer
Gartner
- Developed and improved new and existing features using React, React Native, and Ruby on Rails.
- Refactored React front-end code to optimize performance using functional components, React Query, and HTML5.
- Collaborated with the team to implement new tools to increase the readability of the codebase, such as Prettier, ESLint, etc.
- Implemented React Native for mobile application development.
- Participated in Agile methodologies using Jira and Bitbucket for streamlined project management and version control, ensuring efficient collaboration and code management.
- Utilized Snyk for proactive security monitoring and vulnerability management in front-end development projects, ensuring code integrity and minimizing security risks.
- Translated Adobe XD designs into code for front-end development, ensuring pixel-perfect implementation and visual fidelity across web applications.
Software Engineer
Bloomfire
- Collaborated with the design and product team to build user-friendly and responsive features using Figma.
- Wrote clean, maintainable, fully accessible, and reusable components using React, Redux, React Query, ECMAScript (ES6), and other modern web technologies.
- Conducted comprehensive testing of back-end API functionalities and methods utilizing RSpec.
- Implemented end-to-end testing using Cypress, ensuring robust quality assurance and seamless functionality across various user interactions within the web applications she developed.
- Wrote clean and maintainable code using Ruby on Rails.
- Mentored and onboarded new junior developers to the team.
- Committed and documented the code using Git, GitHub, and Jira technologies.
Front-end Developer
Divercity
- Engaged in Agile development practices and provided mentorship to new developers.
- Documented technical specifications and maintained project documentation while utilizing GitHub and Git for project documentation and collaboration.
- Developed user-friendly and responsive web applications using React, Redux, styled-components, CSS, and Sass.
- Collaborated closely with design teams, utilizing proficiency in Figma to bridge the gap between design and development, ensuring seamless integration and optimal user experiences.
- Integrated Axios seamlessly with React and REST APIs, streamlining data retrieval and management for enhanced application functionality and performance.
Experience
Consumer AI Conversational Platform
Recipe App
https://github.com/kattylucy/arrecipe-2024As the sole developer, I spearheaded the entire project lifecycle, from conceptualization to deployment, leveraging key technologies like Supabase for database management. The app's intuitive design and seamless functionality cater to a broad audience of cooking enthusiasts, providing them with a convenient solution for finding new meal ideas and recipes. Its success in solving the problem of recipe discovery is evidenced by positive user feedback and increasing engagement rates, affirming its value proposition and relevance in the culinary space.
Orin Financial Tracker
https://github.com/kattylucy/orin_financeMy role in this project encompasses designing and implementing the user interface with React, ensuring a seamless and intuitive user experience. On the server side, I was responsible for setting up the Node.js environment, organizing routes, and integrating Supabase to handle real-time data updates efficiently. Additionally, I leveraged Prisma to facilitate efficient and reliable database interactions. By focusing on scalability and reusability, I aimed to deliver a high-performance application that meets users' financial management needs while providing a solid foundation for future feature expansion.
Education
Bachelor's Degree in Systems Engineering
Santiago Marino Polytechnic University Institute - Merida, Venezuela
Certifications
Full-stack Web and Mobile Development
Nucamp Bootcamp
Front-end Development
Team Treehouse
Skills
Libraries/APIs
React, React Query, REST APIs, React Router, Node.js, Web3.js, Recharts, Chart.js, Redux-Saga, RxJS, Framer Motion, Claude API, Stripe
Tools
Git, Figma, NPM, Webpack, Claude Code, Expo, RSpec, Jira, Google Analytics, Adobe Experience Design (XD), Prisma, Claude Agent SDK, Claude
Languages
Python, JavaScript, HTML, TypeScript, CSS, HTML5, SQL, Sass
Frameworks
Redux, React Native, Tailwind CSS, Material UI, Next.js, Ruby on Rails (RoR), Ruby on Rails 4, Cypress, Jest, Parity Polkadot, NestJS
Paradigms
Responsive Web Design (RWD), Automation, Management, UX Design, UI Design
Platforms
Android, iOS, MacOS, Linux, Vercel, Heroku, Docker, NING, Blockchain, Plausible
Storage
MongoDB, PostgreSQL
Other
Front-end, Axios, Web Development, Startups, APIs, Cross-browser Compatibility, Front-end Development, Version Control, Vite, Mobile First, Web Content Accessibility Guidelines (WCAG), UI Components, AI Tools, Mobile Apps, CSS Animations, Full-stack, API Integration, Mobile App Development, User Experience (UX), User Interface (UI), Back-end, Front-end Architecture, Web3, Single-page Applications (SPAs), CI/CD Pipelines, Responsive Web Apps, SaaS, Full-stack Development, Artificial Intelligence (AI), Cursor AI, Cloudflare, Large-scale Projects, Fintech, Styled-components, Programming, IT Management, Snyk, Supabase, Heroku Postgres, Ethers.js, WebSockets, Decentralized Applications, Crypto, Storybook, IPFS, Data Visualization, OpenAI, ElevenLabs Solutions, grok api, Supabase Auth, Payment APIs, Payments, PayPal, AI-generated Video, Text to Image AI, open router, Product Management, Data Management, AI Virtual Assistant, Vercel Analytics, Google Search Console
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring