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Vanclei Matheus

Verified Expert in Engineering

APIs Developer

Curitiba - State of Paraná, Brazil

Toptal member since April 2, 2019

Expertise

Front End Full-stack Code Review Artificial Intelligence VBA Windows Development C#.NET VB.NET SQL REST API Jira

Bio

Vanclei is a senior software engineer and tech lead, with 25+ years of experience building scalable systems globally. He's an expert in event-driven cloud (AWS/GCP), .NET/React/Node.js, and AI-assisted development with Cursor and Claude Code. Vanclei has delivered for Sony, The Weather Group, and Deckers.

Portfolio

Deckers - IT

Amazon Web Services (AWS), AWS Lambda, Amazon DynamoDB, C#, C#.NET, Node.js...

ArtsMarketing Suite LLC

.NET, React, C#, Node.js, ASP.NET, JavaScript, PostgreSQL, CI/CD Pipelines...

identiMetrics, Inc.

.NET, C#, Microsoft SQL Server, Windows Services, C++, APIs, GraphQL, GitHub...

Experience

C# - 17 years
.NET - 17 years
APIs - 15 years
Angular - 10 years
Node.js - 6 years
Amazon Web Services (AWS) - 5 years
TypeScript - 5 years
React - 3 years

Preferred Environment

C#, .NET, Node.js, Amazon Web Services (AWS), Google Cloud Platform (GCP), Cursor AI, Claude Code, React, Docker, CI/CD Pipelines

The most amazing...

...thing was leading a full microservices migration from AWS to GCP — redesigning infrastructure, rewriting integrations, and ensuring zero data loss end-to-end.

Work Experience

AWS Engineer

2024 - 2026

Deckers - IT

Architected and implemented legacy-to-microservices migration on AWS using .NET Lambdas, improving system modularity and deployment flexibility.
Monitored and supported critical eCommerce infrastructure processing millions of transactions during peak seasons for a global footwear brand.
Refactored and performance-tuned .NET microservices to handle increased global traffic, improving reliability under high load.
Pioneered AI-assisted development practices using Cursor and Claude Code, accelerating delivery cycles across the engineering team.

Technologies: Amazon Web Services (AWS), AWS Lambda, Amazon DynamoDB, C#, C#.NET, Node.js, Claude Code, Cursor AI, AI Programming, CI/CD Pipelines, AI Agents, Architecture, Claude, Code Review, AI Copilots, ChatGPT, AI Design, Artificial Intelligence (AI), AI-assisted Development, System Development Life Cycle (SDLC), API Integration, Security, NoSQL, Event-driven Architecture

Tech Lead | Full-stack Developer

2024 - 2024

ArtsMarketing Suite LLC

Designed end-to-end architecture for an AI-powered content generation platform, defining service boundaries, data flows, and technology stack.
Built a proof of concept for multi-modal media processing (PDFs, images, video), validating feasibility for production implementation.
Provided strategic technology consulting on platform architecture, guiding stack selection and service design decisions.

Technologies: .NET, React, C#, Node.js, ASP.NET, JavaScript, PostgreSQL, CI/CD Pipelines, APIs, GitHub, C#.NET, Claude Code, AI Programming, Architecture, Code Review, ChatGPT, AI Design, Artificial Intelligence (AI), Software Development Lifecycle (SDLC), AI-assisted Development, Next.js

.NET Developer

2024 - 2024

identiMetrics, Inc.

Produced comprehensive system documentation and service inventory, enabling the team to reduce onboarding time and improve maintainability.
Refactored a biometric scanner application to support distributed deployment, expanding the system's operational scalability.
Redesigned and automated Azure infrastructure scripts, streamlining deployment and reducing manual configuration overhead.

Technologies: .NET, C#, Microsoft SQL Server, Windows Services, C++, APIs, GraphQL, GitHub, C#.NET, Azure, AI Programming, AI Agents, Architecture, Code Review, AI Design, Artificial Intelligence (AI), AI-assisted Development, API Integration, Security, NoSQL

C# and .NET Back-end Developer

2021 - 2024

The Weather Group

Solely led the migration of a critical AWS Lambda pipeline to GCP, integrating Pub/Sub and Elasticsearch while maintaining data consistency across both platforms.
Drove multiple production deployments, contributing to CI/CD pipeline stability and release confidence.
Modernized .NET codebases across pipeline services, ensuring compatibility with current framework versions and reducing technical debt.
Maintained and evolved a large-scale media processing system handling high volumes of content for a major US weather media company.

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, AWS CloudFormation, APIs, GraphQL, GitHub, Bootstrap, Python 3, C#.NET, Python, Node.js, Cursor AI, AI Programming, CI/CD Pipelines, AI Agents, Architecture, Code Review, AI Design, Artificial Intelligence (AI), Software Development Lifecycle (SDLC), AI-assisted Development, System Development Life Cycle (SDLC), API Integration, Security, NoSQL, Next.js, Event-driven Architecture

Senior Mobile Developer

2020 - 2021

Work & Co

Built the Gx App for Gatorade — a personalized nutrition and hydration recommendation app for individual athletes, delivered for iOS using Xamarin Forms and React Native.
Developed Gx Teams for Gatorade, enabling coaches and staff to manage nutrition and hydration across an entire team from a single mobile interface.
Collaborated closely with the front-end team to bridge iOS-native features into the Xamarin/React Native layer, ensuring a seamless cross-platform experience.

Technologies: Xamarin, iOS, C#, .NET, MongoDB, GitHub, C#.NET, React Native, API Integration, Security

Software Engineer

2019 - 2020

Sony Media Cloud Services

Implemented advanced keyboard navigation for a custom media management UI, improving accessibility and power-user experience.
Built an asynchronous reporting service using AWS SQS, enabling non-blocking report generation at scale for media workflows.
Migrated the Elasticsearch integration across multiple repository versions, maintaining search reliability throughout the upgrade process.
Contributed to hardening the security framework, collaborating with the team to identify and address vulnerabilities across the platform.
Played a key role in developing the new catalog feature for Sony's media cloud service, expanding the platform's core content management capabilities.

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, APIs, GitHub, Bootstrap, C#.NET, ASP.NET Web Forms, CI/CD Pipelines, Code Review, AI Design, Artificial Intelligence (AI), System Development Life Cycle (SDLC), API Integration, Security, NoSQL, Event-driven Architecture

Lead Developer

2014 - 2019

UruIT

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, APIs, Microsoft 365, C#.NET, Architecture, Software Development Lifecycle (SDLC), System Development Life Cycle (SDLC), API Integration

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, APIs, C#.NET, Software Development Lifecycle (SDLC), System Development Life Cycle (SDLC)

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), C#.NET, ASP.NET Web Forms, Architecture

Consultant

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), ASP.NET Web Forms, SQL Server 2000, Architecture, Software Development Lifecycle (SDLC), System Development Life Cycle (SDLC)

System Analyst

2008 - 2009

Third It Ltda (at Electrolux)

Developed a business intelligence solution for the accounting department.
Built and coordinated the migration from an Open Access/Visual Basic 6 (VB6) application to ASP.NET.
Developed integration web services for 3rd-party systems consumption.
Built data Integration components for business intelligence.
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, ASP.NET Web Forms, SQL Server 2000

Coordinator

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, ASP.NET Web Forms, SQL Server 2000, Software Development Lifecycle (SDLC), System Development Life Cycle (SDLC)

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, SQL Server 2000, Architecture, Software Development Lifecycle (SDLC), System Development Life Cycle (SDLC)

Experience

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)

https://github.com/vancleimatheus/Praiera

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.

Education

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

Certifications

OCTOBER 2021 - PRESENT

Toptal React Academy Graduate

Toptal, LLC

JUNE 2002 - PRESENT

Microsoft Certified Solution Developer

Microsoft

MAY 2001 - PRESENT

Microsoft Certified Professional

Microsoft

Skills

Libraries/APIs

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

Tools

Visual Studio, Git, C#.NET WinForms, Jira, Google Docs, xUnit, ELK (Elastic Stack), Terraform, AWS CloudFormation, GitHub, Claude Code, Claude, ChatGPT, TFS, SSAS

Languages

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, Transact-SQL (T-SQL), TypeScript, HTML, GraphQL, Python, C++, Python 3, PHP, PHP 5

Frameworks

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, Next.js, Bootstrap 3, React Native

Paradigms

REST, MVC Design, Event-driven Architecture, Scrum

Platforms

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

Storage

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

Industry Expertise

System Development Life Cycle (SDLC)

Other

Microsoft 365, SOAP, Front-end, Full-stack, CI/CD Pipelines, APIs, Cursor AI, AI Programming, AI Agents, Architecture, Code Review, AI Copilots, AI Design, Artificial Intelligence (AI), Software Development Lifecycle (SDLC), AI-assisted Development, API Integration, Security, Single Sign-on (SSO), Microsoft Data Transformation Services (now SSIS), Remoting, OWC, Geolocation, Windows Services

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