I have experience working in startup environments, using JavaScript/Node.js for backend development, including the creation and maintenance of routes, API integration, and data validation with Joi.I contributed to the development of a metrics system that provided essential and relevant data for users, such as opens, sends, deliveries, and derived metrics in a newsletter system. These metrics were crucial for creating a new dashboard, allowing users to track the performance of their email campaigns with precision.Based on these metrics and an integration with the OpenAI API, clients could gain valuable insights, such as the growth of their user base, the most engaging publications, and suggestions on how to improve their email marketing campaigns.In my daily work, I followed agile methodologies, ensuring quick and high-quality deliveries. I implemented automated tests with Jest and used Postman to test and document APIs, ensuring system reliability and consistency.