Open to opportunities

Sérgio Henrique Freire Holovati

@sergioholovati

Message

Back-end developer specializing in Java microservices, cloud deployments, and event-driven systems.

Brazil

Message

What I'm looking for

I seek back-end or cloud-focused roles where I can build scalable microservices, improve CI/CD and observability, work in collaborative agile teams, and continue growing technically in production environments.

I am a back-end developer with extensive experience designing and maintaining microservices-based systems using Java (including Java 8+ and Java 21), Spring Boot, Quarkus, Kafka, and Docker. I have delivered production features, fixed performance and stability issues, and led CI/CD, observability, and testing efforts across Azure and other cloud platforms.

Across fintech, legal-tech, retail, and platform projects I unified distributed applications into single APIs, implemented event-driven architectures, and drove automated testing (unit, integration, Robot Framework). I routinely apply clean code and SOLID principles, collaborate via Git/Bitbucket/GitLab and JIRA, and use AI tools to streamline testing and refactoring.

Experience

Work history, roles, and key accomplishments

Current

Back-End Developer

Current

TekSystem

Jun 2025 - Present (8 months)

Redesigned an ecosystem to unify four applications into a single Professional Qualifications API using Java 21 and Spring Boot; built event-driven components, implemented unit/integration/Robot Framework tests, and applied SOLID and clean code principles to improve maintainability.

Java 21+Spring Boot MongoDB Docker Event Driven Architecture Unit Testing Integration Testing Robot Framework

Back-End Developer

Magnum

Jan 2024 - Jun 2025 (1 year 5 months)

Developed features, fixed bugs, and managed deployments for a digital banking platform built with Quarkus, Kafka and Oracle SQL in a hexagonal microservices architecture with MuleSoft middleware, improving system reliability and delivery cadence.

Quarkus Java Kafka Oracle MuleSoft AngularJS Docker Azure

Back-End Developer

Attornatus

Jun 2023 - Jan 2024 (7 months)

Implemented Kafka-based event-driven microservices with Java Spring Boot and Docker, performed bug fixes and performance optimizations, and managed CI/CD and monitoring (Kibana, Grafana, Prometheus) on Azure to support major clients like PGE.

Java Spring Boot Kafka Docker Azure Kibana Grafana Prometheus Gitlab CI CD

Back-End Developer

Disys

Oct 2022 - May 2023 (7 months)

Built Kotlin microservices with Spring Boot for O Boticário, delivering features such as franchise control and order imports using Docker, Git and Azure deployments within Scrum processes to improve operational workflows.

Kotlin Spring Boot Docker Azure Git Bitbucket Scrum Jira

Back-End Developer

Multilaser

Mar 2022 - Oct 2022 (7 months)

Developed and maintained chatbots on the Blip platform, creating and optimizing flows that accelerated customer support resolution, warranty processing, and repair requests.

BLIP Chatbot Development Flow API Integration

Fullstack Developer

Unike.TECH

Oct 2020 - Mar 2022 (1 year 5 months)

Developed full-stack features using AngularJS and Java Spring Boot and maintained chatbot integrations on the Blip platform to improve customer support workflows and system reliability.

AngularJS Spring Boot BLIP REST APIs Frontend Development Backend Development Docker Git

Back-End Developer

AT&M Tecnologia

Aug 2018 - Jul 2021 (2 years 11 months)

Built PHP backend for a monolithic system (CodeIgniter), automating chatbots, notifications and email workflows, developing front-end pages and managing SQL databases for a cargo insurance platform.