Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hello! I'm Leonardo Henrique Manzini, a dedicated and results-oriented Software Engineer with over 5 years of experience specializing in backend development, with a strong presence in the banking sector. My pursuit of technology-related knowledge drives me to stay up-to-date in the dynamic world of software engineering. I have a proven track record of delivering high-quality solutions using agile methodologies, such as Scrum, and collaborating effectively with multidisciplinary teams even under challenging deadlines. My technical expertise includes: - Java (8, 11, 17, 21, 24); - Spring Framework; - Flutter; - Cloud technologies such as AWS and GCP; - Microservices and monolithic architectures; - Messaging systems (Kafka, RabbitMQ); - Containers; - CI/CD scripts; - Relational databases (SQL Server, Oracle, MySQL, PostgreSQL); - Non-relational databases (MongoDB, Firestore). This set of technologies allows me to develop efficient, scalable, and high-performance backend systems.…Hello! I'm Leonardo Henrique Manzini, a dedicated and results-oriented Software Engineer with over 5 years of experience specializing in backend development, with a strong presence in the banking sector. My pursuit of technology-related knowledge drives me to stay up-to-date in the dynamic world of software engineering. I have a proven track record of delivering high-quality solutions using agile methodologies, such as Scrum, and collaborating effectively with multidisciplinary teams even under challenging deadlines. My technical expertise includes: - Java (8, 11, 17, 21, 24); - Spring Framework; - Flutter; - Cloud technologies such as AWS and GCP; - Microservices and monolithic architectures; - Messaging systems (Kafka, RabbitMQ); - Containers; - CI/CD scripts; - Relational databases (SQL Server, Oracle, MySQL, PostgreSQL); - Non-relational databases (MongoDB, Firestore). This set of technologies allows me to develop efficient, scalable, and high-performance backend systems.

Leonardo Henrique Manzini

Back-End Developer, App Developer





Hello! I'm Leonardo Henrique Manzini, a dedicated and results-oriented Software Engineer with over 5 years of experience specializing in backend development, with a strong presence in the banking sector. My pursuit of technology-related knowledge drives me to stay up-to-date in the dynamic world of software engineering. I have a proven track record of delivering high-quality solutions using agile methodologies, such as Scrum, and collaborating effectively with multidisciplinary teams even under challenging deadlines. My technical expertise includes: - Java (8, 11, 17, 21, 24); - Spring Framework; - Flutter; - Cloud technologies such as AWS and GCP; - Microservices and monolithic architectures; - Messaging systems (Kafka, RabbitMQ); - Containers; - CI/CD scripts; - Relational databases (SQL Server, Oracle, MySQL, PostgreSQL); - Non-relational databases (MongoDB, Firestore). This set of technologies allows me to develop efficient, scalable, and high-performance backend systems.…Hello! I'm Leonardo Henrique Manzini, a dedicated and results-oriented Software Engineer with over 5 years of experience specializing in backend development, with a strong presence in the banking sector. My pursuit of technology-related knowledge drives me to stay up-to-date in the dynamic world of software engineering. I have a proven track record of delivering high-quality solutions using agile methodologies, such as Scrum, and collaborating effectively with multidisciplinary teams even under challenging deadlines. My technical expertise includes: - Java (8, 11, 17, 21, 24); - Spring Framework; - Flutter; - Cloud technologies such as AWS and GCP; - Microservices and monolithic architectures; - Messaging systems (Kafka, RabbitMQ); - Containers; - CI/CD scripts; - Relational databases (SQL Server, Oracle, MySQL, PostgreSQL); - Non-relational databases (MongoDB, Firestore). This set of technologies allows me to develop efficient, scalable, and high-performance backend systems.

Available to hire

Sao Carlos, Brazil

Hello!

I’m Leonardo Henrique Manzini, a dedicated and results-oriented Software Engineer with over 5 years of experience specializing in backend development, with a strong presence in the banking sector.

My pursuit of technology-related knowledge drives me to stay up-to-date in the dynamic world of software engineering.

I have a proven track record of delivering high-quality solutions using agile methodologies, such as Scrum, and collaborating effectively with multidisciplinary teams even under challenging deadlines.

My technical expertise includes:

Java (8, 11, 17, 21, 24);
Spring Framework;
Flutter;
Cloud technologies such as AWS and GCP;
Microservices and monolithic architectures;
Messaging systems (Kafka, RabbitMQ);
Containers;
CI/CD scripts;
Relational databases (SQL Server, Oracle, MySQL, PostgreSQL);
Non-relational databases (MongoDB, Firestore).

This set of technologies allows me to develop efficient, scalable, and high-performance backend systems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Portuguese

Fluent

Work Experience

Software Engineer at CAST Group

September 1, 2022 - Present

Developed and maintained core back-end systems for high-impact clients in public and financial sectors. Led backend features for Banco da Amazônia’s profitability analysis system using Java 21, Spring, and Oracle SQL; reduced data loading time by optimizing legacy ETL routines and delivered the first production-ready release. Refactored data pipelines for Metrô de São Paulo to ensure proper operational integration with the API project. Worked in a Dockerized environment on Microsoft Azure, deploying compiled images to the registry and proactively implemented a SonarQube quality gate to improve code quality and maintainability.

Software Engineer (Mid-level) at VILT Group

April 1, 2023 - October 14, 2025

Contributed to the development area for clients such as Porto Seguro, focusing on mobile insurance e-commerce using microservices. Tech stack included Java 17, Spring Boot, Kafka, Docker, and Google Cloud Platform; worked with relational (Oracle SQL) and non-relational (MongoDB) databases, utilized code-quality tooling, and CI/CD via Git and GitLab. Improved unit test coverage by around 40% through standardized practices and enhanced teammate onboarding.

Software Engineer (Mid-level) at Santander

April 1, 2022 - October 14, 2025

Worked on risk management, compliance, and banking engineering projects. Developed and maintained Java microservices (Java 11) and Spring-based systems, integrated with messaging platforms (Kafka), and deployed in cloud environments (AWS and IBM). Collaborated on API and web service development for credit approvals and fraud prevention; contributed to DevOps pipelines using Git, GitLab, and Jira; improved test coverage and system reliability.

Software Engineer (Junior-level) at DXC Technology

September 1, 2021 - October 14, 2025

Contributed to card services projects, developing and maintaining backend systems using Java 8/11, J2EE, JPA, relational databases (SQL Server, Oracle SQL), and AWS-based infrastructure. Built APIs and web services within monolithic architectures, applying SonarQube-driven quality practices, and improved developer onboarding through standardized documentation and tooling. Implemented automation to preserve server logs and reduce manual overhead.

Internship in Software Engineering at DXC Technology

March 1, 2021 - October 14, 2025

Card services support role, resolving incident tickets and providing technical support using Java 8/11 and SQL; contributed to process efficiency by leveraging Git, GitHub, and Jira; assisted in onboarding and documentation improvements to reduce knowledge gaps on legacy and ongoing projects.

Flutter Freelancer at Totalis Bank (Fintech)

July 1, 2024 - October 14, 2025

Architected and developed the fintech’s main mobile application using Flutter; implemented frontend and backend integration, including authentication/authorization, data storage, and file storage; delivered features aligned with security and scalability requirements.

Flutter Freelancer at TagFull (Startup)

March 1, 2025 - October 14, 2025

Developed the company’s Warehouse Management System (WMS) in Flutter; created screens following the design system, applied clean architecture, implemented order picking and packing workflows, and integrated native barcode and QR-code scanning on data collection devices; performed performance optimizations for stable warehouse operations.