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SebastianOrtiz2194/README.md

Sebastian Ortiz

Java backend developer based in Hamamatsu, Japan (JST). Most of my work is event-driven microservices with Spring Boot, Kafka and Redis.

I've been writing Java professionally for 4+ years — three of them building enterprise systems at Assert Solutions in Colombia, then a middleware consulting contract at UTS Startups in Sydney. These days I work independently; my main project right now is KuraFlow, a language-learning platform I'm designing end to end.

Projects

  • KuraFlow — language-learning platform for English (CEFR) and Japanese (JLPT). Six independently deployable Spring Boot microservices behind an API gateway, Kafka for events, PostgreSQL, Redis, and a Next.js frontend. Includes an SM-2 spaced-repetition engine, gamification and live leaderboards.
  • order-management-system-hexagonal — event-driven order system built with ports & adapters. Domain-level state machine, cache-aside reads through Redis, Kafka events, Zipkin tracing.
  • deepLearning — asynchronous deep-learning inference over Kafka using Deep Java Library.
  • springboot-microservices-ecommerce — e-commerce backend on Spring Cloud with PostgreSQL, Redis and S3.

Stack

Java Spring Boot Apache Kafka PostgreSQL Redis Docker Kubernetes AWS OpenShift GitHub Actions

Also working with: Spring Security (OAuth2/JWT), Hibernate/JPA, ActiveMQ, MongoDB, Jenkins, Testcontainers, JUnit 5, Mockito, Prometheus/Grafana, Flyway, Maven, Linux.

GitHub Activity

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GitHub streak

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  1. order-management-system-hexagonal order-management-system-hexagonal Public

    Order Management System using Hexagonal Architecture, Spring Boot, Kafka, Redis, and Postgres

    Java

  2. KuraFlow KuraFlow Public

    Language Learning Platform - KuraFlow (English & Japanese)

    Java

  3. store-tracker store-tracker Public

    Spring Modulith tracking customer visits and purchases in retail stores

    Java

  4. deepLearning deepLearning Public

    A microservices platform for asynchronous deep learning inference. Uses Spring Boot, Kafka, Redis, and DJL (Deep Java Library) for real-time image classification

    Java

  5. springboot-microservices-ecommerce springboot-microservices-ecommerce Public

    E-commerce backend built with Spring Boot microservices, PostgreSQL, Redis, AWS S3, and Spring Cloud

    Java

  6. task-manager task-manager Public

    REST API with Spring Boot, Java 21, and MongoDB

    Java