Nelson Djony R. A. Oliveira

Principal consultant at Zing Developers, delivering integration, middleware, and cloud-native solutions for government, fintech, and digital platform clients. All client engagements were executed under Zing Developers' contracts.

Selected Client Engagements:

Ztudium (UK/EU), DevOps & Platform Engineer

• Designed and operated Kubernetes clusters for multi-brand platforms.
• Implemented CI/CD with GitHub Actions and Argo CD.
• Managed AWS and Hetzner Cloud infrastructure.
• Integrated Cloudflare for DNS, security, and performance.

National Police of Cape Verde (Consulting) Integration Architect.

• Acted as Integration Architect and Technical Lead during the migration of national identity and border systems to PEDEX, the new state integration platform built on WSO2, enabling unified interoperability for passport and residence permit services.
• Led the migration from WSO2 Enterprise Integrator 6.2 to WSO2 Micro Integrator 4.3, refactoring mediation flows to improve performance, scalability, and maintainability.
• Designed and implemented integration flows to support data ingestion and real-time data pushing to border control systems, consolidating passenger movement data from all national entry and exit points.
• Supported the migration of a legacy monolithic system to a Kubernetes-based architecture, contributing to application decomposition into microservices, and enforcing stateless design principles.
• Provided architectural guidance on containerization, service design, and integration patterns, supporting the transition to cloud-native practices.
• Acted as a technical reference for integration best practices, introducing documentation standards, agile methodologies, and automation practices across the organization.

Stipter (Netherlands), Java.

• Developed Spring Boot (Java 8) backend services.
• Built and secured REST APIs.
• Modernized legacy AngularJS modules.
• Debugged code to identify errors and fix them efficiently.

Taught undergraduate courses in computer science, covering both theory and applied Software engineering:

• Operating Systems: Structure, process and thread management, process coordination, memory management, file systems, I/O management, security and

protection.

• Distributed Systems: Communication models, networks, security in distributed systems, middleware and services, cloud computing.

• Java Programming & Web Development: Object-Oriented Programming in Java.

• Led digital transformation and system integration projects focused on legal identity.
• Coordinated the integration of eRCMS with national IT systems and databases.
• Collaborated with cross-functional and international teams on secure, scalable solutions.
• Participated in planning, monitoring, evaluation, and reporting of IT integration initiatives.
• Managed documentation to ensure compliance with organizational standards.

• Designed and integrated mission-critical police IT systems using WSO2 Enterprise Integrator (EI), Spring Boot, and Angular 6.
• Designed and developed the Residence Permit (“Green Card”) application, implementing backend services in Spring Boot and frontend applications in Angular, supporting foreign resident registration, lifecycle management, and administrative workflows.
• Designed and implemented SOAP-based services using WSO2 EI to integrate with Vision-Box biometric devices, exposing biometric enrollment and verification services internally to support electronic passport and residence permit systems.
• Delivered secure e-services for foreign residents, biometric integrations, and e-residency platforms, aligned with ICAO standards and national regulations.
• Implemented integrations with border control systems using WSO2 EI to support precautionary measures, orchestrating data exchange with legacy systems from multiple vendors.
• Developed mediation flows, service orchestration, and backend APIs, enabling real-time interoperability between law enforcement, passport issuance, residence permits, and border control platforms.
• Installed, configured, and operated WSO2 Enterprise Integrator on virtual machines, along with supporting software to enable the deployment and operation of Spring Boot, WSO2 EI, and Angular applications.
• Supported production environments, ensuring reliability, security, and maintainability of platforms used by national authorities.

• Designed and developed a mobile application for Garantia Insurance, using Java and native Android, enabling customers to access insurance services through mobile devices.
• Implemented secure authentication, user flows, and data validation to support policy consultation, customer information access, and service requests.
• Integrated the mobile application with backend services to consume
  insurance APIs, ensuring reliable data exchange and consistent business rules across systems.