Jonathan Zepeda Email & Phone Number

El Paso, Texas, United States

Modernized a legacy system using Next.js and Tailwind CSS, enhancing scalability and stability of a 15+ year-old core platform integrated with a Django backend.Migrated frontend code to Next.js, seamlessly aligning with backend upgrades from Django.Reduced code complexity by 20% through modular Next.js components and Tailwind CSS, boosting maintainability.Aligned frontend development strategy with business goals during product planning sessions.Advocated best practices in Next.js and Tailwind CSS, improving overall code quality and user experience.

- Developed data visualization UI with React for management of extensive data sets.- Increased rendering performance 70% for high-volume geospatial data using vector tiles and Leaflet.- Onboarded and mentored developers.Technologies: React, Redux, Next.js, Material UI, Elasticsearch, REST, Node.js, PostgreSQL, Data Visualization, TypeScript

- Developed secure smart contract libraries using Rust and Solidity.- Utilized technologies like React, D3.js, and Redux to create interactive, user-friendly interfaces that present complex data in an accessible manner.- Collaborated with the engineering team in adopting responsive design principles, ensuring optimal user experience across various devices and platforms.Skills: Rust, Solidity, React, D3, System Design, Node, AWS

Engineered responsive and intuitive interfaces using React, Next.js, Tailwind CSS, MUI, Angular, and Vue.js, resulting in a 25% increase in user engagement.Architected RESTful APIs for seamless communication between front and back ends, supporting over 10, 000 daily active users.Leveraged analytical skills in the development and testing process, ensuring robustness and reliability of JavaScript & TypeScript applicationsLiaised with clients to ensure alignment with project goals, achieving a 98% client satisfaction rate.Developed and executed comprehensive tests for performance and security, reducing bug occurrence by 20%.Utilized strong problem-solving capabilities to troubleshoot and resolve complex software issues.Proven track record of being flexible in working with cross-functional teams, ensuring seamless integration of front-end componentsUtilized advanced version control techniques to effectively manage source codes and ensure timely delivery of software solutions

- Developed the ID Verification platform in React and web3.js.- Implemented security processes and automation tools such as Snyk.- Developed React-based admin workflows and upgraded from Angular, enhancing UI and backend API integration.- Conducted comprehensive software testing and validation, including regression and unit tests.- Managed global data and integrated back-end Node APIs using Redux for efficient data handling.Technologies: JavaScript, React, Angular, Node.js, Express.js, Cypress.io, Data Structures, Algorithms, Cypress.io, Jenkins

- Led the transition of an AngularJS app to React, Next.js, and Material UI, integrating GraphQL with REST endpoints.- Developed a serverless function for BigQuery to sort article recommendations, pushing JSON files to S3 for easy front-end use.- Acted as technical lead for rewriting a mobile app in React Native, TypeScript, and GraphQL, aligning with new product direction.- Created an npm library in TypeScript for bank and credit card info validation, encryption, and tokenization, providing a clean API for web apps.Technologies: JavaScript, TypeScript, GraphQL, React, React Native, AngularJS, Apollo, Babel, Webpack, Next.js, GitHub, GitHub Actions, AWS Amplify, Netlify, Node.js, Tachyons CSS, CI/CD, Vercel, AWS Lambda, Apollo

São Paulo, Brazil

Led the development of a dating app focused on restaurant-based connections, building the API, admin panel, and supporting systems. Contributed to UI/UX design and managed the launch, achieving thousands of downloads in the first month. Tech stack included Angular.js, Express.js, PostgreSQL, REST APIs, and DevOps.

São Paulo, Brazil

Developed user dashboards and admin screens as a front-end engineer. Redesigned and created eight purchasable website templates for venue owners. Built fully responsive, cross-browser compatible screens using AngularJS. Tech stack included HTML, CSS, and AngularJS.

São Paulo, Brazil

Designed and built a system to track Brazilian medical items, including a data analysis dashboard. Hired and trained developers. Developed an asynchronous processing solution with a client-side queue for network reliability. Created the Studio framework for core system services. Technologies: D3.js, MongoDB, Node.js, JavaScript, Scala.