Marcelo Jr
Software & Solutions Architect
João Pessoa · Remote
Summary
Solutions Architect and Backend Engineer with 14+ years in high-criticality financial systems. Currently Staff Engineer at Appmax, leading the Banking vertical in Go. Former at Itaú Unibanco, Dock and Conductor, designing distributed architectures on AWS (EKS, microservices) focused on resilience, observability and legacy modernization.
- Technical leadership and build of financial cores in Go: accounts, transactional ledger, savings and PIX.
- AWS architecture with HA, resilience and microservices/Serverless (EKS, ECS, Lambda) and GitOps with ArgoCD.
- Backend engineering with Go, Java (Spring Boot) and Node.js/TypeScript in event-driven flows.
- End-to-end quality and observability: OpenTelemetry, TestContainers/k6 and coverage gates.
Languages
- Portuguese (native)
- English (Advanced)
Professional Experience
Staff Engineer
Appmax
Dec 2025 · Present
Remote
I lead the design and build of the Banking vertical — the platform's financial services core — combining technical leadership with hands-on execution on critical services.
- Built the Banking vertical: onboarding and customer registration, accounts, transactional ledger, savings and PIX integration.
- Tech leadership: architectural decisions, team mentoring and evolution of engineering practices with SDD + TDD and ADRs.
- End-to-end observability with OpenTelemetry; quality with golangci-lint, vulncheck, semgrep, TestContainers, k6 and coverage gates (diff and global).
- CI/CD: Bitbucket Pipelines → ECR → AWS EKS with ArgoCD + Kustomize, ensuring traceable and reproducible deliveries.
Stack: Go, Gin, PostgreSQL, Redis (cache/idempotency), OpenTelemetry, AWS EKS, ArgoCD, Kustomize, Clean Architecture
Solutions Architect
Itaú Unibanco
Mar 2022 · Sep 2025
João Pessoa, Brazil
Design of highly complex distributed architectures on AWS ensuring rigorous security, scalability and resilience requirements.
- Migration of critical microservices from ECS Fargate to Amazon EKS with centralized observability.
- Credit product architecture (portability and external guarantee) with secure integrations and data consistency.
- Strangler Fig strategies to modernize mainframes and monoliths without downtime.
Stack: AWS (EC2, EKS, ECS, Lambda, SNS/SQS, Glue, DynamoDB), Java, Microservices, DDD
Senior Software Engineer
Dock
Nov 2020 · Mar 2022
João Pessoa, Brazil
Squad responsible for Payments and Payment Slip Management core in BaaS platform with serverless architecture.
- Circuit Breaker implementation between microservices preventing cascading failures.
- RDS optimization for transactional peaks with advanced query tuning.
- IaC governance in CloudFormation ensuring auditable environments.
Stack: AWS Serverless, Lambda, API Gateway, RDS/DynamoDB, CloudFormation, Node.js, Java
Software Engineer
Leads2b
Jan 2020 · Sep 2020
Curitiba, Brazil
B2B SaaS platform for commercial intelligence focused on core modernization.
- PHP monolith decomposition to Node.js/TypeScript microservices.
- Redis and ElasticSearch usage for performance and search improvements.
- RabbitMQ queues for async marketing automation workloads.
Stack: Node.js, TypeScript, PHP, Vue.js, MySQL, Redis, ElasticSearch, RabbitMQ
Software Engineer
Conductor Tecnologia
Feb 2019 · Dec 2019
João Pessoa, Brazil
Clearing squad ensuring financial accuracy in card settlement.
- Batch routine optimization in PL/SQL for high transaction volume.
- Java/Spring microservices maintenance for reconciliation rules.
- Critical incident analysis and resolution in banking core.
Stack: SQL Server, PL/SQL, Java, Spring Boot, Batch Processing
Previous Experience
Full Stack Developer
Assert Polo Embrapii
Apr 2017 · Jan 2019
Node.js microservices, Vue.js SPAs and MongoDB for high-performance industrial operations.
Software Engineer
Evomaster Tecnologia
Jan 2015 · Apr 2017
Havite SaaS platform for real estate management. PHP, PostgreSQL, SOLID and Clean Code.
Software Engineer
State Administration Secretary of Paraíba
Dec 2012 · Dec 2014
Legacy PHP systems and MySQL scripts for government data migration and sanitization.
Software Engineer
Grupo e-Gen
Sep 2011 · Jan 2012
Java and Spring Framework backend development for enterprise corporate systems.
Academic Researcher
S.I.D.E. Research Group
Mar 2011 · Jan 2014
R&D in Data Mining and Semantic Web. Academic publications and algorithm analysis.
Technologies
Languages
Backend
Frontend
AWS Cloud
DevOps & Quality
Data
Architecture
Education
Federal Institute of Paraíba
Internet Systems · Computer Science
2010 · 2014
Availability
Open to new opportunities and good conversations about architecture and distributed systems.
marcello.dudk@gmail.com · +55 83 98831-7867