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Elismar13/README.md

👋 Hey, I'm Elismar Silva Pereira

I'm a Fullstack Developer with 5+ years of experience building scalable systems across the automotive, financial, and industrial sectors.

My core focus is backend development with Java (Spring Boot, WebFlux, Quarkus), microservices, and event-driven architectures. I also have experience with frontend development using React and TypeScript, especially in building real-time dashboards and collaborating closely with UX teams.

I enjoy solving real problems through clean architecture, automation, and teamwork.


🚀 Highlights

  • 🧩 Designed and implemented microservice architectures for real-time vehicle telemetry processing (20K+ simultaneous users).
  • 💰 Helped reduce 70% of maintenance effort by modernizing legacy banking systems with Spring Boot and Kubernetes.
  • 📉 Reduced 40% of network payload and 80% of cascading failures in an automotive voice assistant using WebFlux + Protobuf + Resilience4j.
  • 📊 Increased test coverage and deployment stability using CI/CD pipelines with Jenkins, Docker and automated testing with JUnit and Selenium.
  • 🛠️ Created monitoring dashboards and alerting strategies that reduced production debugging time by 50%.

🧠 Current Focus

  • Deepening architectural skills (hexagonal architecture, BFF, DDD, distributed systems)
  • Exploring cloud-native best practices (AWS, Azure)
  • Building developer tools and internal platforms

🛠️ Tech Stack

Languages & Frameworks:
Java (Spring Boot, WebFlux, Quarkus), Node.js, TypeScript, React, Python

Architecture & Patterns:
Microservices, Hexagonal Architecture, RESTful APIs, BFF, Event-driven, DDD, Clean Architecture

Cloud & DevOps:
Docker, Kubernetes, Jenkins, AWS (EC2, Lambda)

Data & Messaging:
PostgreSQL, MongoDB, MySQL, Redis, Kafka, RabbitMQ

Monitoring & Testing:
Grafana, Kibana, Elastic Stack, JUnit, Mockito, Selenium, Locust


📫 Let’s Connect!

  • Collaboration: Open to contributing to open-source or innovative projects.
  • Hire Me: Seeking backend/microservices roles with scalable challenges.
  • Fun Fact: When I'm not coding, you'll find me:
    • Rewatching classic anime (Steins;Gate time travel theories > meetings).
    • Messing with old hardware like overclocking a Core 2 Duo to run Python (why? Because I'ts fun).
    • I automate random life stuff – like a script that texts me when my favorite manga drops a new chapter (no more F5 wars).
    • Playing retro gaming with my newphews.

🌐 Find me elsewhere

LinkedIn Email 🌐 Portfolio


Pinned Loading

  1. status-monitor-api status-monitor-api Public

    Um serviço para monitorar e receber notificações sobre o status de aplicações web.

    Java

  2. devbox devbox Public

    📦 DevBox A lightweight web toolbox for devs: JSON, Base64, Timestamps & more.

    TypeScript

  3. meu-portfolio meu-portfolio Public

    My personal website

    TypeScript

  4. PaymentAPI PaymentAPI Public

    API para realizar pagamentos.

    Java

  5. my-linux-setup my-linux-setup Public

    Shell

  6. pix-processor pix-processor Public

    An opinionated, testable reference implementation of the SPI/Pix message retrieval flow (Brazilian Central Bank). It demonstrates how a PSP can expose a streaming API with parallel collectors, avoi…

    TypeScript