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Barcodehub (Brayan Alexander Barco) · GitHub

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Barcodehub/README.md

Brayan Barco

Backend Engineer · JVM | Java · Kotlin · Spring Boot

AWS Certified Solutions Architect – Associate

🚀 About Me

Backend engineer with 4 years of experience building high-throughput, fault-tolerant services on the JVM — primarily in Java with Spring Boot and WebFlux. AWS Certified Solutions Architect – Associate with production experience optimizing systems for the financial sector. Passionate about fintech solutions and measurable engineering impact.

Current Focus:
  - ⚡ Reactive Programming: Spring WebFlux · Kotlin Coroutines
  - 🏗️  Architecture: Hexagonal · Clean · API-First (OpenAPI)
  - ☁️  Cloud: AWS (ECS, Lambda, SQS, SNS, DynamoDB, S3, Cognito...)
  - 📊 Observability: OpenTelemetry · Prometheus · Grafana · Datadog
  - 🔒 Security: JWT · OAuth 2.0 · Spring Security
  - 🚀 Methodologies: Scrum · Git Flow · Azure DevOps · TDD

💼 Professional Experience

☁️ Java Backend Developer

Pragma S.A. • Dec 2025 – Feb 2026

  • 🐳 Deployed microservices with Docker on Amazon ECS (ECR + ALB)
  • ⚡ Built reactive microservices with Spring WebFlux sustaining sub-250ms p99 latency under peak load (k6 tests)
  • 🛠️ Designed serverless async solution via IaC (CloudFormation / Serverless Framework) with Lambda, SQS, SNS + DynamoDB
  • 🟣 Adopted Kotlin coroutines for non-blocking I/O in new service modules

🏢 Java Backend Lead

Nelumbo Consultores S.A.S • Jun 2025 – Dec 2025

  • 📈 Reduced p99 latency ~80% (1.8s → <360ms) for SURA financial sector APIs
  • 🔄 Migrated notifications to Apache Kafka event-driven model
  • 🔐 Implemented Hexagonal Architecture with AWS (S3, SES, Cognito) + API-First (OpenAPI)
  • 📡 Set up distributed observability with OpenTelemetry + Prometheus/Grafana
  • ✅ 80% test coverage tracked by JaCoCo, quality gates via SonarQube

💻 Full-Stack Java Developer

Bomberos de Villa del Rosario • Jan 2025 – Jun 2025

  • 📍 Mapped 50+ real-time data points via Google Maps API, cutting response time by 45%
  • 🔌 Developed biometric authentication microservice over TCP/IP sockets, improving access-control efficiency by 90%

🛒 Founder & Full-Stack Developer

Calz. Brander • Feb 2021 – Sep 2023

  • 🏗️ Built and maintained e-commerce platforms with Spring Boot for footwear retail businesses
  • 📦 Managed full product lifecycle over 2+ years of operation

🛠️ Tech Stack

Backend & Languages

Cloud & DevOps

Databases & Messaging

Observability & Security

🏆 Certifications

Certification Issuer Year Link
🏅 AWS Certified Solutions Architect – Associate Amazon Web Services 2025 View
🎓 Software Design and Architecture University of Alberta 2025 View
⚡ Parallel, Concurrent & Distributed Programming in Java Rice University 2025 View
🔐 Web Application Security Coursera 2025 View
🛡️ Exploiting & Securing Vulnerabilities in Java Coursera 2025 View
☁️ AWS Cloud Architecting Amazon Web Services 2024 View
🚀 AWS Cloud Developing Amazon Web Services 2024 View
🔴 Oracle Cloud Infrastructure I & II Oracle 2024 View

🚀 Featured Projects

🔀 SFAAS — Strangler Fig as a Service

Modular Platform · Legacy Migration

Progressive monolith-to-microservices migration platform, zero downtime:

  • 🌐 Configurable HTTP proxy with per-endpoint percentage routing
  • 👥 Shadow Mode + Response Diff Engine (JSON/XML comparison)
  • 🚩 Custom Feature Flags engine (by tenant, module, schedule)
  • 🔄 CDC via Debezium + Kafka for bidirectional data sync
  • 📊 Migration dashboard with diff score trends & auto-rollback

Stack: Spring Cloud Gateway · PostgreSQL · Kafka · Debezium · Next.js

View Repo →

⛏️ Mining Management API

3-Microservice Event-Driven System

Illegal mining activity registry with distributed architecture:

  • 🔐 Dedicated IAM microservice (JWT + RBAC)
  • 📡 Kafka async events + immutable audit log (append-only PostgreSQL)
  • 🌿 MongoDB for notifications · S3 for secure file storage
  • 📈 Full observability: Prometheus + Grafana dashboards
  • 🔥 k6 load tests: p99 stable at 500 VUs

Stack: Spring Boot · Kafka · PostgreSQL · MongoDB · Docker Compose

View Repo →

🔭 Observability & Traceability Lab

Distributed Tracing · Saga Pattern

Microservices testbed for enterprise-grade observability:

  • 🧵 Orchestrated Saga with custom header propagation (X-Saga-Id, X-User-Id)
  • 📊 Prometheus + Grafana: p95 latency, error rates, business KPIs
  • 🔍 OpenTelemetry + Jaeger end-to-end distributed tracing
  • 📋 Structured JSON logging with MDC correlation (ELK-ready)
  • 🐕 Datadog APM via OTLP — zero business logic modification

View Repo →

🍽️ Food Court — 4-Microservice System

Hexagonal Architecture · API-First

Complete food court platform (Pragma bootcamp):

  • 👥 Auth service: RBAC (admin, owner, employee, customer)
  • 🍕 Order workflow with state transitions + business rules
  • 📋 Immutable audit trail in MongoDB
  • 📲 SMS notifications via Twilio API

Stack: Spring Boot · PostgreSQL · MongoDB · Twilio · Docker

Repo 1 Repo 2 Repo 3 Repo 4

☁️ Master Cloud — AWS + Hexagonal

5 AWS Services · 21 REST Endpoints

Enterprise-grade cloud system with full AWS integration:

  • ☁️ S3 (file upload + auto thumbnails + pre-signed URLs)
  • 🔐 Cognito JWT validation via Spring Security OAuth2
  • 📧 SES templated emails with Thymeleaf
  • 📖 OpenAPI documentation · 4 Maven modules

View Repo →

⚡ Reactive Bootcamp Microservices

Spring WebFlux · Hexagonal · 5 Services

Reactive enrollment system (Pragma):

  • ⚡ Spring WebFlux with full non-blocking I/O
  • 🗄️ PostgreSQL + MongoDB (polyglot persistence)
  • 📊 Analytics reports module
  • 🏗️ Hexagonal Architecture across all services

Repo 1 Repo 2 Repo 3 Repo 4 Repo 5

🦺 Biometric Inspection System

Hybrid Microservices · Production

Real security system deployed for fire department:

  • 🔌 TCP/IP socket biometric communication
  • 📍 Google Maps API (50+ real-time data points)
  • 🎯 90% access-control efficiency improvement
  • 🐳 Dockerized on Fedora Linux

View Repo → · Demo →

🚗 Parking System

Multi-tenant Architecture

Advanced parking management:

  • 🔑 JWT multi-device authentication
  • 👥 Role-based access control
  • 🔄 RabbitMQ async email service
  • 📈 Analytics & reporting

View Repo →

📊 GitHub Statistics

💡 "Building fault-tolerant systems that scale, one microservice at a time."

Ad Maiorem Dei Gloriam ✞

Made with ❤️ by Brayan Barco

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    Microservices-based API provides user advanced authentication and basic product management functionality.

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    arquitectura hexagonal template one (crud de productos spring+postgre)

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    prueba tecnica parking system con spring boot

    Java

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