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igorzelaya-io/README.md

Igor A. Zelaya

Senior Backend Developer | Java · Spring Boot · Distributed Systems

Igor designs and builds distributed, event-driven backend systems using Java and Spring Boot — from multi-vendor sourcing platforms and banking middleware to enterprise ERP systems and national-scale government registries. His focus is translating complex business requirements into reliable, high-performance software through Domain-Driven Design, Hexagonal Architecture, and modern engineering practices.

Currently building

MercadoX — an event-driven, multi-tenant e-commerce platform built as a set of Spring Boot microservices (core domain logic, OAuth2 authorization, context management, async messaging) communicating over Kafka.

Background

  • 7+ years building backend systems for enterprise clients across retail sourcing, fintech, and government platforms
  • Led the modernization of a national land-tenure registry system (Java 1.6 → 11), boosting processing speed by over 60%
  • Designed a cloud-based banking switch middleware used for daily payment reconciliation and authentication between banks and government institutions
  • Led delivery of enterprise ERP and multi-vendor sourcing platforms integrating PostgreSQL, Apache Kafka, and external vendor APIs

Tech stack

Languages & Frameworks: Java · Spring Boot · Spring Security · Hibernate / JPA · QueryDSL Data & Messaging: PostgreSQL · DynamoDB · Apache Kafka · RabbitMQ · ActiveMQ · JMS Cloud & DevOps: Docker · Kubernetes (GKE / OKE) · Azure · GCP · Jenkins · Bitbucket Pipelines Testing & Quality: JUnit · Mockito · SonarQube

Writing

Building a RESTful Web Service — published in The Startup on Medium (750K+ readers).

Reach me

LinkedIn · Email

Pinned Loading

  1. mercado-x-core mercado-x-core Public

    Microservice for MercadoX — owns orders, inventory, and carts; orchestrates the order lifecycle and publishes domain events over Kafka.

    HTML 1

  2. mercado-x-email mercado-x-email Public

    Microservice for MercadoX — Kafka-driven email and WhatsApp notification delivery with template management.

    HTML 1

  3. mercado-x-library-jpa mercado-x-library-jpa Public

    Shared library for MercadoX — JPA repositories, QueryDSL infrastructure, and automatic multi-tenant row filtering.

    Java 1

  4. mercado-x-oauth mercado-x-oauth Public

    Microservice for MercadoX — identity provider issuing RSA-signed JWTs with multi-tenant access control and key rotation.

    Java 1

  5. mercado-x-parent mercado-x-parent Public

    Root Maven parent for the MercadoX ecosystem — dependency management, shared build config, and module declarations.

    Java 1

  6. mercado-x-context mercado-x-context Public

    Shared library for MercadoX — JWT verification, multi-tenant context propagation, and idempotency enforcement.

    HTML 1