Adan William

Junior Backend Developer · Java · Spring Boot

Building reliable backend applications, REST APIs, and scalable software solutions.

     

Portfolio  ·  LinkedIn  ·  GitHub

I am an IT professional with 5+ years of experience in infrastructure, networking, and operations, currently transitioning into software development.

My primary focus is backend development using Java and Spring Boot, building REST APIs, authentication systems, business applications, and distributed services.

My background in infrastructure and operations gives me a practical perspective on software beyond the code itself. I understand the importance of reliability, observability, troubleshooting, and how systems behave in production environments.

Currently focused on building practical projects and continuously improving my software engineering skills.

• Backend development with Java and Spring Boot
• Authentication and authorization with Spring Security and JWT
• RESTful API design and integration
• Data persistence with JPA, Hibernate, and PostgreSQL
• Microservices and Spring Cloud
• Containerization with Docker
• Cloud and CI/CD fundamentals
• Frontend integration using React and TypeScript

Backend

Frontend

Databases & Infrastructure

Tools

A healthcare management platform designed to explore backend architecture, authentication, authorization, and real-world business rules.

• JWT-based authentication and authorization
• Role-based access control
• Healthcare professional and patient management
• Appointment scheduling
• Administrative dashboard
• Financial management

Java 17 · Spring Boot 3 · Spring Security · JWT · PostgreSQL · React

Status: In Development

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A practical project focused on microservices architecture using the Spring ecosystem.

• Service Discovery
• Centralized Configuration
• Service-to-Service Communication
• Distributed Architecture
• Containerization

Java · Spring Boot · Spring Cloud · Docker

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A full-stack application for managing movies and TV shows, integrating with the TMDB API.

The project explores frontend and backend integration, data persistence, and third-party API consumption.

Java 17 · Spring Boot · React · TypeScript · PostgreSQL

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A data analysis and machine learning project focused on the real estate market.

The application explores data processing, exploratory analysis, predictive models, and interactive data visualization.

Python · FastAPI · Pandas · Scikit-learn · Streamlit

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My background in infrastructure and operations taught me to think about software beyond implementation, including reliability, monitoring, availability, and real-world system behavior.

Experience investigating incidents and technical issues in critical environments has strengthened my analytical thinking and troubleshooting skills.

I focus on writing code that is organized, maintainable, testable, and designed to evolve.

I believe practical projects are one of the best ways to develop technical skills. I continuously study new concepts and apply them through real-world software projects.

UniFatecie

CI&T — Java AI Copilot Digital Innovation One · 53 hours September 2026

Java · Artificial Intelligence · Software Development

Itaú — Java with Artificial Intelligence Digital Innovation One · 45 hours September 2026

Java · Spring · Artificial Intelligence

     

Java · Spring Boot · REST APIs · PostgreSQL · Docker · Microservices