JOÃO_LEONELLO

FULL_STACK_ENGINEER.EXE

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With 5+ years of experience in software development, I have worked across both dynamic startups—where I quickly adapted to fast-paced environments—and large financial institutions, delivering critical solutions in agile teams.

My expertise spans backend and frontend development, with a focus on scalable architectures, microservices, BFF (Backend for Frontend), and complex system integrations. I have hands-on experience with CI/CD pipelines, cloud infrastructure, and containerized environments, ensuring efficient deployments at scale.

With a strong track record of technical leadership, I actively support teams, unblock challenges, and drive high-impact deliveries through well-architected solutions.

  • • 5+ years of software development experience
  • • 3+ years in financial institutions, delivering critical systems
  • • Expertise in Backend-for-Frontend (BFF) architecture and microservices
  • • Strong foundation in system design, scalable architectures, and distributed systems
  • • Deep knowledge of data structures & algorithms
  • • Proven ability in technical leadership, unblocking challenges, and driving high-impact deliveries

Java
TypeScript
Angular
Vue.js
Spring Boot
MySQL
PostgreSQL
Redis
Docker
Kubernetes
Kafka
Go

Jan 2023 — Present

Full Stack Engineer, Foursys | São Paulo

  • • Designed and implemented BFF service and REST APIs for Bradesco's Global Solutions platform
  • • Developed microservices using Java Spring Boot, DDD, and Clean Architecture
  • • Led technical discovery and supported junior developers
  • • Worked on Bradesco mobile banking app with Angular and micro frontends

Jan 2022 — Dec 2022

Backend Engineer, Foursys | São Paulo

  • • Developed and maintained critical banking APIs using Java + Spring Boot
  • • Contributed to system design, code quality, and deployment strategies

Sep 2021 — Feb 2022

Full Stack Developer | Londrina

  • • Transitioned from Node.js to Java Spring Boot
  • • Developed geolocation-based systems using Java Spring Boot and Angular
  • • Implemented RabbitMQ for efficient data handling

Sep 2020 — Sep 2021

Full Stack Developer | Londrina

  • • Developed e-commerce platform with dropshipping integrations using SQS queues
  • • Implemented ElasticSearch to index 80,000+ products
  • • Developed custom WYSIWYG editor in Vue.js
  • • Implemented JWT authentication and session management with Redis

Jan 2020 — Sep 2020

Jr Full Stack Developer | Londrina

  • • Contributed to end-to-end development of a foodtech app
  • • Delivered scalable solutions in a fast-paced startup environment

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