Carlos OrtizSenior Frontend Developer

Built an interactive platform that simulates real React technical interviews, where developers solve timed coding challenges in TypeScript with instant test-based feedback and a realistic development environment.

• Developed a full-stack Next.js application that allows users to solve React challenges under timed conditions, emulating real interview scenarios.
• Implemented a secure testing server that receives challenge code submissions, runs automated tests in isolation, and returns structured feedback to the client.
• Integrated the Monaco Editor with TypeScript support and a Vim keybinding layer for an authentic developer experience.
• Used Sandpack to dynamically render React components in-browser, enabling instant visual previews of user solutions.
• Designed and managed a PostgreSQL database using Drizzle ORM to store users, challenge attempts, results, and progress history.
• Created a custom API layer for handling submissions, timing, and test evaluation, ensuring performance and sandboxed isolation.
• Built a clean, responsive interface using Tailwind CSS and shadcn/ui components for consistency and accessibility across devices.
• Implemented secure authentication, session handling, and middleware for route protection and challenge access control.
• Optimized the build and deployment process for Vercel, including the integration of a dedicated runtime for test execution and challenge rendering.

In FlowArchitect our mission is to empower developers and businesses by transforming complex AI workflows into seamless, open-source solutions. We simplify AI integration through accessible, flexible, and scalable tools, enabling innovation and productivity across applications of all sizes.

• Led the development of frontend architecture for AI-driven workflow applications.
• Defined the technical roadmap and architecture for the Design Workflow project.
• Designed and implemented scalable, maintainable, and reusable UI components using React.
• Defined workflows that could be translated into the Common Workflow Language.
• Collaborated with cross-functional teams to translate business requirements into intuitive and efficient user interfaces.
• Integrated APIs and AI tools seamlessly into frontend workflows to deliver intelligent application solutions.
• Led developers and provided guidance to team members, fostering a collaborative and high-performing engineering culture.
• Conducted code reviews to maintain high standards of quality and technical excellence.
• Implemented automated testing strategies to ensure the reliability and robustness of frontend components.

Started building a ChatGPT-powered customer service tool at Urchin Labs, integrating OpenAI and Pinecone vector database for WooCommerce sites. When the startup did not secure follow-on funding, I took full ownership of the project — completing development independently, documenting specifications, and launching it as MainGPT, an AI-powered chat assistant for online businesses with semantic search, contextual memory, and seamless WordPress integration.

• Designed and developed AI-driven chat interfaces using React and Vue.js, integrating OpenAI (ChatGPT) and Pinecone for semantic search, contextual memory, and tailored customer responses.
• Built a custom WordPress plugin for seamless AI assistant integration into existing business websites, including WooCommerce support.
• Built the core website using a headless WordPress setup with Next.js and GraphQL, delivering a modern, fast, and interactive user experience.
• Set up CI/CD pipelines with GitHub Actions to automate testing and deployment.
• Conducted extensive testing with Vitest and Playwright to ensure reliability, scalability, and performance across plugin and website.
• Took full ownership when the startup ceased operations — completed development independently, documented technical specifications, and launched the product as MainGPT.

Network Rail is the owner and infrastructure manager of most of the railway network in Great Britain. As a public sector body, accessibility and compliance were core requirements. I worked on several projects for the company's internal systems, primarily leading the development of the new corporate website and providing guidance to other teams and agencies.

• Designed the architecture, development, and maintenance of the company's corporate website.
• Led the design and implementation of new features and functionality to enhance the user experience.
• Defined standards and tech stack in collaboration with other agencies and teams.
• Created custom Gutenberg blocks based on Advanced Custom Fields and Vue.js
• Developed a design system using Storybook to manage all frontend resources of the corporate website.
• Created single-page applications and other microsites based on Vue.js
• Monitored website performance and took appropriate action to ensure optimal performance.
• Ensured WCAG 2.1 AA accessibility compliance across the corporate website and all microsites, implementing keyboard navigation, screen reader support, and ARIA best practices within the design system.

Klood was a digital marketing agency based in Milton Keynes that specializes in inbound marketing.

• Met with clients to discuss website designs and functionality.
• Created custom plugins, themes, and functions for WordPress websites.
• Tested frontend code in multiple browsers to ensure cross-browser compatibility.
• Worked with multiple APIs and RESTful Services.
• Built reusable code and libraries for future use.
• Optimized pages for page speed using Google PageSpeed (API) for Apache to achieve higher rankings on Search Engines (SEM).
• Frontend development using the latest HTML5 and CSS3 techniques, enhanced by jQuery to enable optimum user experience throughout the websites.
• Worked in Agile methodology.