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Darlison Osorio

@darlisonosorio

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Senior full-stack software engineer building REST APIs, web apps, and mobile experiences on AWS.

Brazil

Message

What I'm looking for

I’m looking for a senior full-stack role where I can deliver REST APIs, web and mobile apps with AWS, strong CI/CD and automated testing, collaborate in an English-speaking environment, and apply practical generative AI work using RAG and prompt engineering.

I’m a senior full-stack software engineer focused on building and deploying RESTful systems end to end. I develop with Java/Kotlin (Spring Boot, Quarkus), Python (Django), and Node.js (NestJS, Express), and I ship web experiences with Angular, React, and Vue.js.

In my roles, I’ve designed and deployed financial platforms and store/education services, working with AWS and microservices patterns. I’ve integrated event-driven components and messaging, and I’ve delivered features like credit card and Pix-related functionality while connecting apps to AWS Lambda-based RESTful APIs and GraphQL.

I bring a strong engineering foundation—CI/CD with GitHub Actions, GitLab CI, and Jenkins, automated testing with JUnit/Cucumber/Selenium/Jest/Cypress, and containerized deployments using Docker and Kubernetes. I also enjoy applying generative AI approaches (prompt engineering, RAG, fine-tuning, and AI agents) with tools like Claude and ChatGPT, in an English-speaking environment.

Experience

Work history, roles, and key accomplishments

Current

Senior Fullstack Software Engineer

Current

Keep Simple It

Jan 2024 - Present (2 years 6 months)

Develops REST APIs using Java/Kotlin (Spring Boot) and Node.js (NestJS), and builds web applications with React and Angular. Also develops mobile apps with Flutter and uses AI tools such as Claude and ChatGPT.

Java Kotlin Spring Boot Node.Js Development NestJS React Angular Flutter Claude ChatGpt

Senior Fullstack Software Engineer

DBC Company

Jan 2022 - Jan 2024 (2 years)

Developed REST APIs using Java Spring Boot and Quarkus and built mobile applications with Flutter. Implemented web pages using Vue 3 and React.js and integrated services with AWS microservices infrastructure.

Java Spring Boot Quarkus Flutter Vue.Js React AWS

Senior Frontend Software Engineer

Conta Simples

Jan 2021 - Jan 2022 (1 year)

Developed a financial website using React.js and a mobile app using React Native with TypeScript. Integrated mobile features related to credit cards and Pix with AWS Lambda-based RESTful APIs and GraphQL.

React React Native TypeScript AWS Lambda REST APIs GraphQL

Systems Analyst

Fundação Paulo Feitoza

Jan 2012 - Jan 2020 (8 years)

Responsible for architecture and development of Java Android and Flutter apps, and for developing websites using Angular, Vue.js, and React. Developed RESTful APIs with Java Spring Boot, Python Django, and Node.js, and deployed/published projects to mobile stores and AWS.