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Nilton Mendes Fontes Neto

@niltonmendesfontesne

Senior Software Engineer at QBem applying LLMs and RAG to insurance solutions and AI-assisted engineering workflows.

At QBem, I support engineering projects and analyze health, dental, and life insurance products while developing full-stack solutions with .NET, ReactJS, Next.js, and TypeScript. I apply LLMs and RAG to ground generative AI in retrieved information and business context.

Across insurance, transportation, payments, and cooperative operations, I’ve developed back-end, front-end, and mobile applications, payment APIs, ERP systems, and digital channels. I also work with microservices and messaging, and use Claude Code and Codex in specification, implementation, refactoring, and testing workflows.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

QBem

Nov 2025 - Present (1 year)

Support the engineering team on on-demand projects and analyze products for health, dental, and life insurance benefits. Develop full-stack solutions using .NET, ReactJS, Next.js, and TypeScript, with Kafka and RabbitMQ messaging and n8n workflow orchestration.

.NET Framework .NET 6 10 C#React Next.js TypeScript Kafka RabbitMQ N8n Typesense Elasticsearch Kibana LLM RAG Agentic Harnesses Claude Code Codex SDD CI CD Azure DevOps Unit Testing

Senior Software Engineer

MAG Seguros

May 2025 - Oct 2025 (5 months)

Worked on the insurance policy team, focusing on back-end development. Developed solutions using .NET Core 3 and .NET 6 with Azure Durable Functions, Azure Service Bus, and Application Insights.

.NET Core 3 .NET 6 C#Durable Functions Azure Service Bus Application Insights Microservices CQRS DDD SOLID LLM RAG Agentic Harnesses AI assisted Development SDD CI CD Azure DevOps Unit Testing

Senior Software Engineer

Grupo JCA

May 2022 - Apr 2025 (2 years 11 months)

Performed business and systems analysis for the transportation sector. Developed back-end, front-end, and mobile applications, working with software architecture, microservices, CQRS, DDD, SOLID, ORM, and CI/CD pipelines.

.NET Core React Angular Flutter HTML5 CSS JavaScript Oracle SQL Server Microservices RabbitMQ CQRS DDD SOLID Azure DevOps Unit Testing

Senior Software Developer

Capitani Group

Oct 2021 - May 2022 (7 months)

Performed business and systems analysis for the payments sector. Developed and maintained payment APIs and digital channels using Laravel, PL/SQL, Flutter, PHP, Vue.js, HTML5, CSS, and JavaScript.

Laravel Pl SQL Flutter PHP Vue.Js HTML5 CSS JavaScript RabbitMQ Oracle Scrum Gitlab DevOps Unit Testing

Systems Analyst

Cooperativa Central Ailos

Nov 2020 - Oct 2021 (11 months)

Performed business and systems analysis for the cooperative's payments operations. Developed and maintained ERP systems, APIs, and digital channels for payments, payroll, and check custody.

.NET Core .NET Framework Entity Framework Pl SQL Progress PHP HTML5 CSS JavaScript Oracle SQL Server Azure DevOps Unit Testing

Systems Analyst

Rovitex

Sep 2018 - Oct 2020 (2 years 1 month)

Performed business and systems analysis for sales operations. Developed and maintained e-commerce platforms, sales force applications, ERP systems, and API integrations.

.NET Core .NET Framework AngularJS Angular Flutter PHP Pl SQL MySQL PostgreSQL SQL Server SQLite RabbitMQ CQRS DDD CI CD Unit Testing

Software Developer II

Romagnole

Jan 2016 - Sep 2018 (2 years 8 months)

Performed systems and infrastructure analysis. Managed company websites and API integrations, and maintained and supported servers, security, networks, and databases.

.NET Framework PHP JavaScript J2ME Shell Scripts PowerShell Uniface Windows Server Linux Azure ADFS VMWare Hyper V

Software Developer

Romagnole

Jul 2012 - Dec 2015 (3 years 5 months)

Analyzed and developed software systems. Managed company websites and API integrations, working with .NET Framework, PHP, HTML5, CSS, JavaScript, Java ME, VB, Shell Script, PowerShell, and Uniface.