• Engineered and deployed new features and bug fixes for a sports web application using Ruby on Rails, JavaScript, and PostgreSQL. Streamlined athlete sign-up processes for Zoom coaching sessions, enabling 100% participation rate. Optimized user interface for seamless management of one-on-one sessions, subscriptions, and payments, significantly enhancing user satisfaction and operational efficiency.• Integrated Stripe API with Ruby on Rails to fully automate payment and invoicing processes on the platform, ensuring secure and efficient transactions. Streamlined email marketing by incorporating Mailchimp for template creation and campaign management, and leveraged Contentful for user-friendly content management of articles, news, and categories, enabling non-technical staff to update information with ease.• Implemented new features and manage updates in a tourism web application with Angular, Ruby on Rails and MongoDB to allowed the users to manage 90% of their tourism trips and reservations wich includes transportation, alimentation and lodging, also helps the users to made their payments through the platform and received invoices.• Improved performance by 95%, developing new features and updates, also fixing bugs in a banking web application with Angular permits the users to make bank transfers and payments, also display products and account statements.