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Bruno R. Zeferino
Bruno R. Zeferino

Full-Stack Developer

Actively looking · Member since 5 Nov 2026
Location
Maringá, Brazil
Desired salary
Confidential
Work preference
Remote Only / Full Time, Part Time, Contract, Freelance, Temporary
Experience level
Mid

About

Professional summary

I am a Full-Stack Developer with more than seven years of experience building, maintaining, and modernizing web applications. I work across frontend and backend development, with a strong focus on Java-based enterprise systems.

I build user interfaces with React, Angular, Vue.js, Next.js, and JSP. I enjoy creating reusable components and improving the usability and maintainability of existing applications.

On the backend, I develop REST APIs and application features using Java, Spring, Spring Boot, and Hibernate. I have experience working with PostgreSQL and Oracle databases, including database migration and query troubleshooting.

I am experienced with testing, reporting, and enterprise environments, using tools such as JUnit, Postman, JasperReports, iReport, IBM WebSphere, and React Native. My work includes supporting operational systems, ERP platforms, academic software, and employee time-tracking applications.

I continuously explore new technologies through personal projects and hands-on experimentation. I also use AI-assisted development tools, including GitHub Copilot and OpenAI Codex, to support code generation and refactoring.

Notice period: Immediately

Skills

23 capabilities
AngularAPI IntegrationBackend DevelopmentFrontend DevelopmentHibernateIntegration TestingJavaJavaScriptJSPJunitNext.jsOraclePostgreSQLReactReact NativeREST APIsSpringSpring BootSQLTypeScriptUnit TestingVue.JsWeb Application Development

Tech stack & tools

Working toolkit

Application Hosting

GitHub Codespaces

Application Utilities

Postman

Data Stores

MySQLOracle DatabasePostgreSQL

Design

Figma

Development

DockerEclipseGitGitHubVS Code

Languages & Frameworks

CSS3HTML5JavaJavaScriptJUnitNext.jsNode.jsReactTypeScript

Experience

Career history

Full Stack Developer Stefanini

I build reusable React components and frontend pages for an employee time-tracking application. I also refactor legacy Java and JSP code to improve maintainability and usability while preserving existing business logic.

I troubleshoot PostgreSQL queries and REST API integrations, validating endpoint behavior with Postman. I maintain and enhance Java applications deployed on IBM WebSphere and use GitHub Copilot and OpenAI Codex to assist with code generation and refactoring.

Full Stack Developer Gente Seguradora

I developed frontend features for an internal business platform using Vue.js. I implemented Java and Spring REST API endpoints to support application functionality.

I wrote PostgreSQL queries to retrieve and manage application data. I also developed operational reports using JasperReports and iReport.

Full Stack Developer IADTEC

I supported the migration of an ERP database from Oracle to PostgreSQL. I developed backend features using Java and Spring Boot and frontend functionality using Angular.

I wrote unit and integration tests with JUnit to validate application behavior. I also maintained a React Native mobile application, troubleshooting and resolving issues on Android devices.

Full Stack Developer Núcleo de Processamento de Dados - UEM

I developed student grade-management and reporting features for an academic system. The work used Java, Hibernate, ZK Framework, JasperReports, and iReport.

I contributed to application functionality supporting academic data management and report generation.

Education

Learning history

Universidade Estadual de Maringá - UEM

Bachelor of Science, Computer Science

Graduated with a Bachelor of Science in Computer Science in 2020.

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