🇧🇷 PT

Software & Solutions Architect

I architect systems that scale with your business.

14+ years designing and building distributed systems for banks, fintechs, and SaaS. Currently Staff Engineer at Appmax, leading the Banking vertical — from accounts and transactional ledger to PIX — with Go, Kubernetes, and end-to-end observability. From design to deploy, focused on resilience and security.

GitHub LinkedIn Resume

Availability

Open to opportunities

Open to opportunities · Remote

Location

João Pessoa, Brazil

Remote · UTC -3 to +2

Snapshot

Overview

June 2026

Main Stack

Daily technologies

From backend to infrastructure — the technologies that power the systems I design and deliver.

Node.js · TypeScriptGoDocker · KubernetesAWS (EKS/Lambda)

Location

João Pessoa · Remote

Available for global projects in UTC -3 to +2 timezones.

Contact

marcello.dudk@gmail.com

GitHub Stats

  • 19+

    Public repos

  • 14+

    Years of experience

  • TS · Go

    Main language

Current Focus

What I'm focused on

Core Banking & financial systems
Advanced Go & concurrency
OpenTelemetry & SRE
Rust

About

Hi, I'm Marcelo Jr

Solutions Architect and Backend Engineer with 14+ years in high-criticality financial systems. Currently Staff Engineer at Appmax, leading the build of the Banking vertical. Former at Itaú Unibanco, Dock, Conductor, and Leads2b. Always open to new opportunities and good conversations about architecture.

Financial cores in Go: accounts, transactional ledger, savings, and PIX.

Resilient distributed systems on AWS (EKS) with end-to-end observability.

DevOps and GitOps: CI/CD, ArgoCD, IaC, and zero-downtime deploys.

Experience

Relevant projects and deliveries

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Event-driven Banking core in Go

Appmax · Staff Engineer

Banking Vertical from Scratch

Problem

The platform needed its own financial services core — accounts, ledger, savings and PIX — with the reliability expected from a banking core.

Architectural Solution

I lead the design and build of the core services in Go with Clean Architecture: transactional ledger, idempotency via Redis, PIX integration and end-to-end observability with OpenTelemetry.

Results

  • In-house financial core: accounts, ledger, savings and PIX
  • Quality backed by SDD + TDD, coverage gates and GitOps with ArgoCD
GoGinPostgreSQLRedisAWS EKSArgoCD
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EKS topology + financial integrations

Itaú Unibanco · Solutions Architecture

EKS as Standard Platform

Problem

Critical microservices ran on ECS Fargate with low observability and governance.

Architectural Solution

Designed blueprint to migrate workloads to Amazon EKS, standardizing deploys, logs/metrics mesh and integrations with credit products.

Results

  • Increased operational control and troubleshooting in minutes
  • Platform ready for new portability and external guarantees products
AWS EKSEC2SNS/SQSDynamoDBJava
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Circuit breaker in serverless architecture

Dock · Squad Athos

Circuit Breaker in Payments Core

Problem

Cascading failures between Lambda microservices affected payment slip processing.

Architectural Solution

Implemented resilience patterns, centralized telemetry and RDS optimization to absorb transactional peaks.

Results

  • Stability during external intermittencies
  • RDS bottleneck reduction with tuning focused on critical queries
AWS LambdaAPI GatewayRDSCloudFormationNode.js
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Skill Layers

Capability map by layer

AWS Architecture

HA, resilience, orchestration and GitOps.

4 items
  • EKS · ECS · Lambda · EC2
  • SNS/SQS · API Gateway
  • DynamoDB · RDS · Glue
  • ArgoCD · Kustomize · CloudFormation

Backend

Event-driven Go, Java and Node.js.

4 items
  • Go · Gin · Clean Architecture
  • Spring Boot · Microservices
  • Node.js · TypeScript · Express
  • Event-driven · DDD · System Design

Modernization

Strangler Fig and legacy coexistence.

4 items
  • PHP/Java monolith decomposition
  • Safe data migration
  • Mainframe integration
  • Progressive rollout without downtime

Data & Observability

Tuning, messaging and observability.

4 items
  • PostgreSQL · MySQL · SQL Server
  • MongoDB · Redis · ElasticSearch
  • RabbitMQ · SQS
  • OpenTelemetry · k6 · Circuit Breakers

Open Source

Featured projects

Personal projects showcasing my work

Skriba

SaaS

Complete church management system focused on uncomplicated financial management and deliberative assemblies.

Mession

SaaS

Platform connecting missionaries, supporters and agencies — centralizing support and communication.

Hubbio

SaaS

Your bio links hub. Share your bio and all your links on a customized, beautiful, and modern page.

Runasty

TypeScript

Competitive running leaderboard integrated with Strava. 5K, 10K and half marathon.

Boardscore

TypeScript

Real-time digital scoreboard for board and card games.

 View all repos →