Available for new opportunities

Senior& Solutions Architect.

I design and ship backend platforms that scale — clean hexagonal architecture, cloud-native, 18+ years, zero shortcuts.

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English Spanish

18+

Years

45+

Team led

15+

Companies

Industries

About

Who I am

I'm Carlos Andrés Montoya Tobón, a Senior Java Backend Engineer and Solutions Architect based in Medellín, Colombia. For the last 18+ years I've been designing and building Java-based platforms — from transportation management systems and telecom transactional portals to fintech PaaS and blockchain credentials.

My specialty is backend architecture with the Spring ecosystem (Spring Boot), microservices and event-driven systems — distributed messaging with Kafka and RabbitMQ, NoSQL at scale with Cassandra — deployed on AWS, GCP and Azure. As Technical Lead and Solutions Architect I've led distributed teams of up to 45 engineers, driven DevOps culture and agile delivery (certified Scrum Master), and helped organizations modernize their stacks and pipelines.

When I'm not coding, I enjoy learning about new tech with my best friends and spending time at home with my wife Viky and our two dogs, Ragnar and Leo.

Skills

Technical stack

Tools and technologies I use daily to design, build and operate distributed systems.

◆ Backend

Java18y

Kotlin8y

Spring Boot15y

Spring Cloud12y

Spring Security12y

Hibernate14y

Kafka6y

RabbitMQ10y

Cassandra7y

REST / gRPC12y

Keycloak6y

● Cloud & Infrastructure

AWS10y

GCP6y

Azure4y

Kubernetes6y

Docker8y

GKE4y

KrakenD4y

Terraform3y

▲ DevOps & Tools

Jenkins10y

GitHub Actions5y

SonarQube8y

Nexus8y

Gradle8y

Maven15y

PostgreSQL10y

MySQL14y

Oracle SQL12y

Scrum Master10y

✦ AI & Productivity

Claude Code1y

GitHub Copilot2y

JetBrains Junie1y

Prompt Engineering2y

Experience

Career timeline

Highlights from 18+ years of building, leading and shipping software.

Filter by stack

May 2026 — PresentActive

Soldife

6+9microservices + SDKs

Solution Architect & Tech Lead

Remote

JavaSpring BootHexagonal ArchitectureDDDMicroservicesArchUnitGitHub ActionsKrakenDGraalVMStructurizr

Sep 2024 — Jan 2026

F2X - Flypass

Commissions & billing · microservices

Backend Developer

Medellín, Colombia

JavaSpring BootMicroservicesHexagonal ArchitectureAWSPostgreSQL

Blerify

JavaVert.xKotlinKeycloakKrakenDBlockchainPostgreSQLGCPKubernetes

Apr 2022 — Jun 2023

Tul

B2B marketplace · warehousing

Backend Developer

Medellín, Colombia

JavaSpring BootSpring SecurityMicroservicesHexagonal ArchitectureAWSPostgreSQL

Aug 2020 — Apr 2022

k4s - Klever for Solutions

PaaS Architect · health

Solutions Architect

Medellín, Colombia

JavaSpring BootAWSKeycloakGCP

Integral Software SAS

KotlinJavaSpring BootPostgreSQLReactAngularKeycloakHexagonal

Software Estratégico

JavaSpring BootRabbitMQCassandraDevOps

Aug 2013 — Sep 2015

Tata Consultancy Services

45+developers led

Technical Lead

Medellín, Colombia

JavaSpringWebSphere PortletsOracle Service BusJenkins

PATH S.A.

JavaAWSIoTCI/CD

Ceiba Software House

JavaJEE 5StrutsJSFOracle SQLTomcat

Castor SAS (antes Mercurio)

JavaServletsJSPJavaScriptSQL ServerMySQLTomcat

Projects

Selected work

A focused look at the systems I have shipped recently.

Featured

Mr. Yoker

Secure ticket-purchasing system built on blockchain, issuing W3C verifiable credentials for each ticket to guarantee authenticity and prevent fraud.

JavaSpring BootBlockchainW3C Verifiable CredentialsCryptography

Featured

MyGuidelines — Engineering Standards

My engineering playbook, codified — the architecture, testing, security and clean-code standards I hold every project to, and the trade-offs behind them. Hexagonal + DDD for JVM microservices, written to be executable by engineers and AI coding agents.

Hexagonal ArchitectureDDDClean CodeTestingSecurity

View Live

Llevape

Designed the architecture and components for a warehouse-management system in Peru — Keycloak-secured, Spring Boot with Kotlin and Java on Gradle, backed by PostgreSQL.

KotlinJavaSpring BootKeycloakGradlePostgreSQL

Mutual SER — Microfrontends

Service portal for MutualSER built as composable micro-applications with Module Federation, secured by Keycloak over a clean-architecture backend.

JavaSpring BootReactKeycloakModule Federation

Hexadialer

Predictive and arithmetic dialer for call centers, optimizing agent-to-customer connection rates through real-time pacing algorithms.

JavaSpring FrameworkAsteriskPostgreSQL

MyPipelines

Reusable CI/CD pipeline library — parameterized GitHub Actions workflows (build, tag-filtered tests, JaCoCo coverage, OWASP scan, ArchUnit, Spotless) shared across JVM, KrakenD and NGINX projects.

GitHub ActionsCI/CDReusable WorkflowsOWASPArchUnit

View Live

AI Engineering · For your team

Software delivered with AI discipline

Senior backend engineer, full-stack (Java + React), DevOps and Java solution architect. I fit the architecture to the problem — hexagonal, microservices, event-driven or modular monolith — pairing Spring Boot and agentic workflows with Claude Code to ship production-ready software in a fraction of the time, without sacrificing testing, ADRs or observability.

Let's talk about your project →

Delivery 3–5× faster

Agentic workflows (discuss → plan → execute → verify) ship in hours what takes days traditionally, while preserving atomic commits and real tests.

Architecture without shortcuts

Clean architecture, ports & adapters, ArchUnit gates and ADRs are non-negotiable — agentic speed never comes at the cost of structure.

Tests + observability built-in

Tests (JUnit, Karate, Testcontainers), structured logging and OpenTelemetry tracing are wired from day one, not bolted on later.

Your team keeps the workflow

I leave your team the workflow, not a black box: the agents, skills and guidelines stay in your repo and your engineers keep using them after I'm gone.

What I offer

Agentic delivery

Custom agents and discuss→plan→execute→verify pipelines wired into your codebase — production-ready features in a fraction of the time, tests and ADRs included.

RAG & MCP servers

Spring AI + Qdrant retrieval and Model Context Protocol servers in Java/Kotlin that expose your internal systems and knowledge bases as first-class agent tools.