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Arnoldo Jucá

@arnoldojuc

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Senior .NET Engineer & Tech Lead (18+ yrs) | Cloud-native on Azure | Payments & ERP integration | Agentic engineering

Portugal

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At Planet (formerly Planet Payment), I led the technical evolution of a mission-critical payment management platform serving 100+ markets. I contributed to RBAC across the web frontend, legacy Windows Forms application, and REST APIs, and integrated Microsoft Entra single sign-on.

I’m building PayFlow, an open-source payment gateway on Microsoft Azure. Its payment services use Azure Service Bus, transactional outbox messaging, idempotent APIs, and CQRS-style data access.

At Decodificar Soluções LTDA, I co-founded a B2B SaaS company and designed payment and fiscal automation products integrated with TOTVS ERP. I built a payment receipt system with real-time ERP integration and a background service for electronic tax documents and XML digital signatures.

Earlier, I led ERP integration and modernization work at TIVIT Synapsis and Indra Company. I also develop with Claude Code in VS Code connected to WSL2, using agents, custom instructions, and review loops across the SDLC.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

PayFlow

Jul 2026 - Present (3 months)

Designing and building PayFlow, an open-source, cloud-native, event-driven payment gateway on Microsoft Azure, developed end-to-end with an agentic engineering workflow using Claude Code in VS Code with remote access to WSL2.

C#.NET 10 ASP.NET Core PostgreSQL EF Core Dapper Azure Service Bus Azure Key Vault Managed Identities AKS Terraform OpenTelemetry azure monitor Application Insights Docker GitHub Actions Claude Code VS Code (Remote WSL)WSL

Senior Software Engineer / Tech Lead

Planet

Nov 2020 - Jun 2026 (5 years 7 months)

Led technical evolution of a mission-critical payment management platform (Gateway Service back-office and Customer Web Portal) serving 100+ markets. Managed architecture consistency across a heterogeneous technology stack and contributed to RBAC and SSO integration.

C#.NET Framework Core Spring Framework ASP.NET MVC Web API Angular 2+TypeScript SQL Server Windows Forms REST APIs Jira Confluence Docker Kubernetes RBAC Microsoft Entra ID GitHub Enterprise CI CD

Partner & Systems Analyst

Decodificar Soluções LTDA

Jul 2017 - Oct 2020 (3 years 3 months)

Co-founder and technical architect of a B2B SaaS company building payment and fiscal automation products integrated with TOTVS ERP. Designed serverless API architecture with AWS Lambda and DynamoDB, and built a payment receipt system with real-time ERP integration.

C#.NET Core ASP.NET MVC Web API AWS Lambda DynamoDB Entity Framework SQL Server Soap Rest Windows Services Digital Signatures

Senior Systems Analyst

TIVIT Synapsis

Aug 2013 - Jun 2017 (3 years 10 months)

Led the integration of the internal ERP with third-party service management software, owning the architectural specification, functional/technical requirements and coordination across backend, database and integration teams. Also drove performance improvements across the ERP.

C#.NET REST SOAP APIs XML SQL Server

Senior Systems Analyst

Indra Company

Mar 2010 - Jul 2013 (3 years 4 months)

Led the migration of a credit management platform from .NET 1.1 to 2.0 with unit test coverage, then its rebuild in ASP.NET MVC with layered tier separation, reducing the defect escape rate.

C#ASP.NET MVC WCF SQL Server