Open to opportunities

Carlos Fernando dos Santos

@carlosfernandodossan

Message

Senior .NET developer specializing in cloud-native microservices, APIs and legacy modernization for financial systems.

Brazil

Message

What I'm looking for

I seek senior backend/cloud roles where I can lead architecture, modernize legacy systems, mentor teams, and deliver secure, scalable fintech solutions.

I am a Senior .NET developer with over 10 years of experience building scalable back-end systems, cloud solutions on Azure and GCP, and microservices for banking and fintech clients. I focus on Domain-Driven Design, Clean Architecture, API development and modernizing legacy systems, delivering measurable impact on international projects.

As a technical leader I mentor teams, drive architectural decisions, and manage end-to-end delivery including DevOps with Kubernetes and Docker. My recent work includes back-end development for Pix Crédito at Carrefour Bank and multiple cloud migration and modernization engagements using C#, .NET (Core/6/8), Python, SQL and NoSQL databases.

Experience

Work history, roles, and key accomplishments

Current

Senior .NET Backend Developer

Current

Act Digital

Aug 2025 - Present (6 months)

Develop back-end services for the Pix Crédito project at Carrefour Bank using C#, .NET and DDD to build scalable microservices on GCP and Docker, improving platform reliability and performance for loan products.

.NET C++DDD GCP Docker MongoDB Redis MySQL Microservices

.Net Developer

Venice Technology

Jun 2023 - Aug 2025 (2 years 2 months)

Built back-end components for the Mobilize CO project using C#, .NET and DDD, integrating SQL Server, Cosmos DB and Azure Service Bus while communicating with Spanish-speaking stakeholders.

.NET C++DDD SQL Server Cosmos Azure Service Bus Redis Microservices Azure

Software Engineer

Companhia Excelsior de Seguros

Dec 2022 - Jun 2023 (6 months)

Maintained and developed internal services using C# and .NET Core, implemented unit tests and message-based integrations with Azure Service Bus to improve system stability.

.NET Core C++xUnit Azure Service Bus Azure DevOps Git SQL Server Maintenance

.Net Developer

Blite Tecnologia

May 2022 - Dec 2022 (7 months)

Developed APIs and features for Localiza using .NET Core 6 with DDD, EF Core, Quartz jobs and unit tests to deliver reliable backend services.

.NET Core DDD EF Core PostgreSQL SQL Server Quartz xUnit Azure DevOps Git

Senior .NET Developer

.Net Developer

Best.Projects

Nov 2020 - Aug 2021 (9 months)

Maintained and developed back-end APIs and microservices in .NET Core, upgraded platform versions and implemented RabbitMQ messaging and ElasticSearch for improved data retrieval.

.NET Core RabbitMQ Elasticsearch EF Core SQL Server React TypeScript Azure DevOps

.Net Developer

Retornar

Mar 2020 - Oct 2020 (7 months)

Developed v2 of a RESTful Web API e-commerce platform in .NET Core 3.1, leveraging MongoDB and EF Core to support international expansion.

.NET Core Web APIs MongoDB EF Core Azure DevOps Git REST Microservices

Full Stack Developer

Advise Brasil

Jun 2019 - Mar 2020 (9 months)

Developed backend APIs in ASP.NET and front-end applications using JavaScript and AngularJS, delivering end-to-end features for client applications.

ASP.NET C++SQL Server JavaScript AngularJS APIs Frontend Backend

Full Stack Developer

ForLogic

Jan 2016 - Mar 2019 (3 years 2 months)

Worked on on-demand delivery projects building front-ends (Ext.js, Angular) and back-ends (ASP.NET MVC, C#) following DDD practices and integrating with SAP technologies.