I've been working as freelance software developer for almost 2 years. During this time I've worked with the development of REST APIs and building micro services for many projects and customers using Java and Go as main languages, also I could build projects using Spring framework. The REST APIs was responsible for provide data and functionalities to frontend applications following the principles of design and programming good practices. Beyond that, I've made the integration and consume between API's and services using libs such as OkHttp, RestTemplate and GoResty. These APIs provided external resources like authentication, geo-localization, integration with payment providers, notification services and more. To ensure the quality and security of the developed APIs, I've used tools such as JUnit, Mockito and Postman, Spring Security and JWT.