Vanclei Matheus, Developer in Curitiba - State of Paraná, Brazil
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Vanclei Matheus

Verified Expert  in Engineering

Software Developer

Curitiba - State of Paraná, Brazil
Toptal Member Since
April 2, 2019

Vanclei has excelled at working with .NET technology for over 15 years. He co-authored a book about C# with two Microsoft Brazil employees and delivered various solutions in the .NET platform. Vanclei has strong database skills and collaborates with both local and remote teams of different sizes.


The Weather Group
C#, .NET, SQL, Google Cloud Platform (GCP), Angular, Elasticsearch, .NET Core...
Work & Co
Xamarin, iOS, C#, .NET, MongoDB
Sony Media Cloud Services
Amazon Web Services (AWS), .NET Core, Scrum, xUnit, ELK (Elastic Stack)...




Preferred Environment

C#, Git, Visual Studio, MongoDB, .NET, Visual Studio Code (VS Code)

The most amazing...

...feature I've implemented was a real-time video zoom in/out and crop feature for a content management system of a big media company.

Work Experience

C# and .NET Back-end Developer

2021 - 2024
The Weather Group
  • Single-handedly migrated an existing AWS lambda flow to GCP, interacting with Pub/Sub and Elasticsearch and writing it back to AWS.
  • Contributed to a number of deployments to production.
  • Migrated code pipelines to match new .NET versions.
  • Maintained and helped evolve a media processing system.
Technologies: C#, .NET, SQL, Google Cloud Platform (GCP), Angular, Elasticsearch, .NET Core, AWS Lambda, Cloud Firestore, Amazon DynamoDB, SQL Server 2010, Amazon Web Services (AWS), Terraform, TypeScript, Front-end, ASP.NET Core, Full-stack, HTML

Senior Mobile Developer

2020 - 2021
Work & Co
  • Developed an app for individual nutrition and hydration recommendations for Gatorade, Gx App.
  • Created an app to manage the nutrition and hydration of a team for Gatorade, Gx Teams.
  • Collaborated with the front-end team to translate iOS-specific features to Xamarin.
Technologies: Xamarin, iOS, C#, .NET, MongoDB

Software Engineer

2019 - 2020
Sony Media Cloud Services
  • Created keyboard navigation dynamics for the product custom view.
  • Created a reporting service to generate asynchronous reports using AWS Queue.
  • Migrated code for different versions of the ElasticSearch repository.
  • Worked together on ensuring and helping the security framework.
  • Participated in the development of the new catalog feature for the media service.
Technologies: Amazon Web Services (AWS), .NET Core, Scrum, xUnit, ELK (Elastic Stack), Elasticsearch, JavaScript, REST APIs, MongoDB, Vue, AngularJS, C#, .NET, Angular, AWS Lambda, TypeScript, Front-end, ASP.NET Core, Full-stack, HTML, MVC Design

Lead Developer

2014 - 2019
  • Created a dynamic edition platform for multiple clients.
  • Developed a flexible security framework for a Sass client.
  • Led a development team based in two different countries.
  • Implemented generic data export functionality for the existing system.
  • Incorporated API integration for legacy systems inside and outside the company's network.
Technologies: Scrum, Jira, Git, jQuery, REST APIs, Single Sign-on (SSO), AngularJS, Microsoft SQL Server, C#, ASP.NET, React, Angular, TypeScript, Front-end, Full-stack, HTML

Senior Developer

2013 - 2014
Bravi S/A
  • Gathered requirements and designed a new WPF Data tool.
  • Developed WPF to access both SQL Server and Oracle databases.
  • Extended WPF components to suit project requirements.
  • Developed Xamarin app for Android phone.
  • Optimized database performance for existing system.
Technologies: Scrum, TFS, Xamarin, AngularJS, Windows Presentation Foundation (WPF), Microsoft SQL Server, .NET, Angular, Front-end, HTML

System Analyst

2011 - 2013
Exxonmobil Business Support Center Brasil
  • Supported critical application for oil pipelines.
  • Developed billing application for project team.
  • Supported and developed data integration on SQL Server for pipeline metrics.
  • Developed API components for accounting office.
  • Migrated legacy application to .NET.
Technologies: ASP.NET, C#, .NET, SQL Server Reporting Services (SSRS), Microsoft Data Transformation Services (now SSIS), Visual Basic 6 (VB6)


2009 - 2011
Cinq Technologies Ltda. (at Exxonmobil)
  • Migrated legacy application to .NET.
  • Developed apis to provide legacy system visibility to other processes in the company.
  • Helped define strategy and solutions for new in-house application.
  • Provided technical advice on running applications.
  • Optimized SQL Server database for refinery application.
Technologies: Visual Basic for Applications (VBA), Windows Server, Microsoft Data Transformation Services (now SSIS), SQL Server Reporting Services (SSRS), Entity, Microsoft SQL Server, C#, .NET, Visual Basic 6 (VB6)

System Analyst

2008 - 2009
Third It Ltda (at Electrolux)
  • Developed Business Intelligence solution for accounting department.
  • Migrated Access/VB6 application to ASP.NET.
  • Developed Integration Web Services for third party systems consumption.
  • Developed data Integration components for BI.
  • Provided technical advice on Microsoft technologies.
Technologies: Visual Basic for Applications (VBA), Microsoft 365, Visual Basic, VB.NET, C#, .NET, Microsoft Data Transformation Services (now SSIS), SQL Server Reporting Services (SSRS), SSAS


2006 - 2008
Vega I.T.
  • Coordinated the development team. Owned the recruitment and mentoring on agile projects.
  • Designed an ASP.NET ERP for small shops provided as SASS.
  • Designed and developed segregation for multiple clients consuming the same solution.
  • Developed biometric integration using .NET for HR systems.
  • Created web services to expose the application's data.
Technologies: Remoting, .NET, PHP, Microsoft SQL Server, SOAP, C#, ASP.NET

System Architect

2002 - 2006
Datasul S.A.
  • Architected company's budget planing tool.
  • Developed a component framework to support company's ERP solution.
  • Researched viable solutions to implement company's Business intelligence tool.
  • Supported Legacy Business Intelligence tool.
  • Developed Business Intelligence Cubes for SQL Server.
Technologies: SQL Server Analysis Services (SSAS), C#, Visual Basic 6 (VB6), SSAS, Microsoft SQL Server, OWC, Windows

Book: Desenvolvendo com C# (Developing with C#)

I co-authored a book about the C# language with two Microsoft employees. The book was used as a textbook for some private universities in Brazil.

It was launched at Microsoft's Professional Developer Conference in Brazil.

ISBN: 9788536303468

Praiera (Personal Project)
A beer/cold beverage delivery service app intended to deliver products where the customer requests them (geolocation), such as at the beach or in the sand.

Technologies used: REST API, ASP.NET, AngularJS, Entities, Git, Geolocation, Bootstrap, HTML5

Defendeu (Personal Project)

A web application for soccer players. The objective was to find goalkeepers available in their area.

Technologies used: Integration with Google+, Facebook, AngularJS, .NET, REST API, MongoDB, Azure, WhatsApp integration

Toptal React Academy

The Toptal React Academy is an exclusive learning program that teaches the React framework to select members of the Toptal network. After a month of study, all graduates are tasked with completing a 30-40 hour final project to build and deliver a React app from scratch.
2016 - 2021

Bachelor's Degree in Information Systems

Universidade Estácio de Sá - Curitiba, Brazil

1996 - 1998

Specialist Degree in Information Technology

Colégio Estadual do Paraná - Curitiba, Brazil


Toptal React Academy Graduate

Toptal, LLC


Microsoft Certified Solution Developer



Microsoft Certified Professional



REST APIs, jQuery, Node.js, React, Vue


Visual Studio, Git, C#.NET WinForms, Jira, xUnit, ELK (Elastic Stack), Terraform, Google Docs, TFS, SSAS


Windows Presentation Foundation (WPF), .NET, AngularJS, .NET Core, ASP.NET Core 2, ASP.NET, ASP.NET Web Forms, ASP.NET Web Services, Entity Framework Core, Entity, Angular, ASP.NET Core, Bootstrap 3


VB.NET, Visual Basic, C#, C#.NET, Visual Basic 6 (VB6), Visual Basic for Applications (VBA), Visual Basic .NET (VB.NET), Active Server Pages (ASP), JavaScript, SQL, T-SQL (Transact-SQL), TypeScript, HTML, PHP, PHP 5


REST, MVC Design, Scrum


Xamarin, Amazon Web Services (AWS), Windows, Amazon EC2, Visual Studio Code (VS Code), Google Cloud Platform (GCP), AWS Lambda, Oracle, Azure, iOS, Windows Server, Windows Server 2000, Firebase


SQL Server 2000, SQL Server Analysis Services (SSAS), SQL Server 2008, SQL Server 2010, MongoDB, PL/SQL, Elasticsearch, Microsoft SQL Server, PostgreSQL, SQL Server Reporting Services (SSRS), Cloud Firestore, Amazon DynamoDB


SOAP, Front-end, Full-stack, Single Sign-on (SSO), Microsoft Data Transformation Services (now SSIS), Microsoft 365, Remoting, OWC, Geolocation

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