Jhonatan Llerena

Senior Web Developer

NovoPayment•  September 2018 - May 2024•  Caracas, Venezuela (Hybrid)

- Modernized technology stacks by migrating from PHP/CodeIgniter to React, Next.js, and TypeScript, achieving a 20% improvement in application performance and enhanced scalability. - Developed secure enterprise solutions with RESTful APIs and JWT/JWE authentication, ensuring comprehensive data protection and compliance with industry standards. - Created a critical CPO transfer module, driving a 30% increase in transactions and a 35% improvement in user satisfaction through intuitive user experience. - Optimized application architecture using Redux and Context API, streamlining frontend-backend integration and reducing system complexity. - Led technical team transformation, mentoring 4 developers in TypeScript adoption, reducing production errors by 45% and improving code maintainability. - Boosted team productivity by 25% through Agile/Scrum methodologies, achieving a 95% on-time delivery rate using Jira and GitHub. - Implemented a testing strategy, achieving 85% test coverage using React Testing Library and Jest, ensuring reliability and reducing production bugs. - Implemented i18next for internationalization, enabling seamless support for English and Spanish users. - Managed a seamless transition to remote work, maintaining 100% team productivity and collaboration during organizational changes.