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Fabio Nunes

@fabionunes

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Senior Java Developer with expertise in cloud and microservices.

Brazil

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What I'm looking for

I'm seeking a role that fosters innovation and collaboration, with opportunities for growth in cloud technologies and system architecture.

I am an experienced Senior Java Full Stack Developer with over 6 years of expertise in backend solutions, specializing in high-throughput, scalable, reliable, secure enterprise systems. Proven track record leading critical projects for a multinational company using mainly Java (6–21), Groovy, and Spring Boot. I have a strong background in microservices architecture, database optimization, and cloud migration (AWS & Kubernetes), as well as refactoring legacy systems for performance and reliability and implementing robust security measures.

Experience

Work history, roles, and key accomplishments

Current

Senior Java Developer/System Consultant

Current

Telefônica Brasil (Vivo)

Apr 2020 - Present (6 years 2 months)

Led a 2-year project reducing critical incidents by 80% and increasing stability.

Migrated an event management system to a private cloud, enhancing reliability by 75% and cutting costs by 15%. It now handles 30 million requests/month.

Developed over 10 backend systems using Java/Groovy with Oracle/MySQL.

Integrated systems using REST, RPC, gRPC, Kafka, RabbitMQ, and IBM MQ.

Java Groovy Spring Boot Oracle MySQL Kafka RabbitMQ ActiveMQ Microservices

Owner

Cerqueira Tecnologia LTDA

Jul 2021 - Dec 2024 (3 years 5 months)

Led a 1.5-year fintech project with Java, Spring Boot, Angular, and Oracle/PostgreSQL.

Reduced AWS cloud costs by 10% within a year.

Provided EDI architectural guidance for secure transactions.

Developed 8 bill payment modules supporting global partners.

Delivered technical support, saving $250,000 annually.

Java Spring Boot Angular Postgres Oracle Cloud EDI App Architecture

Junior Java Developer

AirOn Brasil

Jul 2019 - Apr 2020 (9 months)

-Delivered 3 production-ready projects, ensuring timely completion and high-quality execution.
-Made Proof of Concepts (POCs) using Kotlin for Android, exploring innovative solutions and technical feasibility.
-Successfully resolved and fixed over 25 critical production bugs, significantly improving system stability and reliability.

Java Groovy Kotlin Oracle MySQL Spring Boot REST gRPC Microservices

Information Technology Teacher

SuperGeeks

Jan 2019 - Jun 2019 (5 months)

- Teaching programming classes to students aged 7 to 16 using languages
such as Ruby, HTML, CSS, JavaScript, C++, and Python;
- Teaching students about the use of frameworks and libraries like Ruby on
Rails and React.js;
- Developing additional content for classes in the mentioned languages;
- Coordinating and developing classes aimed at participating in the Brazilian
Informatics Olympiad (OBI).

Ruby Ruby on Rails HTML CSS JavaScript C++Python

Assistant IT Manager

Secretaria do Emprego e Relações do Trabalho

Sep 2015 - Dec 2018 (3 years 3 months)

Providing technical support to users both in-person and remotely, including
Level 1, Level 2, and VIP support;
- Performing corrective maintenance on computers, mice, keyboards, monitors,
switches, and printers;
- Conducting technical visits for preventive maintenance at some of the company's 250 units within the state of São Paulo;
- Supervising and guiding interns/new employees in the department

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