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Wellington Guimarães Pimenta

@wellingtonguimarespi

Senior .NET engineer at Act Digital, delivering Bank of America microservices and REST/gRPC APIs for mission-critical financial operations.

Brazil

Message

At Act Digital, I’m delivering high-availability .NET 8 backend services for Bank of America’s financial platform, including microservices and REST and gRPC APIs.

At Grupo Taking, I led engineering for Banco Crefisa SA’s loan management platform. Its microservices handled up to 98,000 daily activations, and Open Finance API integrations improved onboarding and proposal processing by 30%.

At FourSys Consultancy, I reduced CM Capital Markets microservice processing time by 15x. For Genial Investimentos, I refactored batch processing that had taken hours to run in minutes.

Across financial, insurance, telecom, and market research platforms, I’ve worked on cloud-native systems, regulated integrations, and legacy modernization. I’ve also led engineering teams, mentored developers, and contributed to architectural decisions.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer (.NET)

Current

Act Digital

Nov 2025 - Present (11 months)

Contracted to deliver high-availability backend services for a large-scale financial platform. Designed and developed high-availability backend microservices using C# and .NET 8 for mission-critical financial operations.

C#.NET 8+ASP.NET Core Microservices REST APIs gRPC Azure Docker Kubernetes Datadog

Senior Backend Engineer (.NET)

Grupo Taking

Nov 2024 - Nov 2025 (1 year)

Tech Lead for a high-availability loan management platform. Led the engineering team for a 24x7 no-stop system with API integrations with regulatory government systems.

C#.NET 8+ASP.NET Core Microservices REST and gRPC APIs AWS SQL Server Redis MongoDB Docker Kubernetes

Senior Backend Engineer (.NET) | Tech Lead

FourSys Consultancy

Jun 2022 - Oct 2023 (1 year 4 months)

Contracted to deliver high-availability backend services for a large-scale financial platform. Reduced microservice processing time by 15x through performance optimization and architectural improvements.

C#.NET Microservices REST and gRPC APIs AWS Docker Kubernetes Redis Oracle

Senior Backend Engineer (.NET)

FourSys Consultancy

Apr 2021 - May 2022 (1 year 1 month)

Contracted to deliver high-availability backend services for a large-scale investment platform. Reduced critical batch processing execution time from hours to minutes through refactoring and performance tuning.

C#.NET ASP.NET Core Microservices REST and gRPC APIs AWS Docker Kubernetes Redis Oracle

Senior Software Engineer (.NET) | Tech Lead

Accenture

Nov 2020 - Apr 2021 (5 months)

Senior Backend Developer on international telecom billing systems (Oracle BRM). Supported large-scale international telecom billing systems in highly available Linux environments.

C#.NET REST APIs Microservices CI CD Linux Docker Kubernetes

Senior Software Engineer (.NET) | Tech Lead

Cognizant

Jul 2019 - Mar 2020 (8 months)

Led a backend engineering team supporting a high-availability market research platform used across the United States. Led a backend engineering team of 8 developers.

C#.NET Core Angular JavaScript TypeScript REST APIs SQL Server

Senior Software Engineer (.NET)

FOURSYS Consultancy

Nov 2017 - Jul 2019 (1 year 8 months)

Senior Backend Developer working on large-scale financial and fiscal systems. Worked on electronic invoice control portal projects: REINF, NF-e, NFSe.

C#.NET Microservices REST and gRPC Oracle Redis Kubernetes

Senior Backend Engineer (.NET) | Project Lead

Itaú Unibanco SA

Aug 2014 - Jan 2016 (1 year 5 months)

Senior Backend Developer working on large-scale financial systems. Developed systems for consigned credit: Contracts, credit installment, refinancing, portability.

C#Pl SQL Sybase Oracle SQL Server VB6 PowerBuilder Java JSF PrimeFaces

Senior Software Engineer (.NET)

Banco BMG

Jul 2012 - Jul 2013 (1 year)

Senior Backend Developer working on large-scale financial systems. Developed systems for consigned credit: Contracts, credit installment, refinancing, portability.

C#VB6 Pl SQL Sybase Oracle SQL Server Java PrimeFaces

Senior Software Engineer (.NET)

Veotex S/A

Aug 2010 - Jul 2012 (1 year 11 months)

Senior Backend Developer working on large-scale security and monitoring systems. Developed control and image transmission system for cameras via cell phone.

C#VB.NET C++ Builder Pl SQL SQL Server