Matheus Oliveira Full Stack .NET Developer
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Software engineering

Matheus Oliveira

Full Stack .NET Developer

.NET engineering for enterprise systems that need to evolve without losing reliability.

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  • .NET
  • Razor Pages
  • SQL Server
  • Architecture
  • APIs
  • AI in engineering workflow

Delivered systems

Here are some real examples of systems I have developed for web and mobile. This portfolio shows a representative sample, not the full set of projects.

Web

DashboardRazor - Financial Control

In production

Financial web system

Web financial control system with KPI dashboards, entries, support catalogs, robust authentication, APIs for web/mobile integration, and OpenAI API integration to generate insights based on expense and income data.

  • .NET 8
  • Razor Pages
  • Minimal APIs
  • Identity + JWT
  • Dapper
  • SQL Server

Mobile

OS App White Label

In evolution

Mobile app (service orders)

Offline-first mobile app for service order operations, with secure authentication, local queue, outbox-based sync, checklist/report execution, comments and attachments.

  • Flutter
  • Dart
  • Drift/SQLite
  • Dio
  • Provider
  • Offline-first Sync

Technical Expertise

Hands-on experience developing enterprise systems using .NET, SQL Server and layered architectures, focused on performance, code organization and business rule reliability, with an engineering workflow based on version control, continuous delivery and AI assistance.

Backend

  • C# logo C#
  • VB.NET logo VB.NET
  • Blazor logo Blazor
  • .NET logo .NET

Databases

  • SQL Server logo SQL Server
  • MongoDB logo MongoDB

Frontend & Cloud

  • HTML logo HTML
  • CSS logo CSS
  • JavaScript logo JavaScript
  • Azure logo Azure
  • .NET MAUI logo .NET MAUI
  • Flutter logo Flutter

Engineering Tools & Workflow

Tools that support my professional engineering workflow: IDEs, version control, DevOps, and AI assistants used deliberately to speed up delivery without losing quality.

  • Visual Studio
  • VS Code
  • Git
  • Azure DevOps
  • ChatGPT
  • Codex
  • GitHub Copilot

Experience

Education

Associate Degree in Systems Analysis and Software Development

2019 - 2023

UNICID - University of Cidade de São Paulo

Professional Background

Aptus Tecnologia da Informação

Fullstack .NET Developer - September 2024 - Present

Campinas - SP, Brazil

Working on the development and evolution of enterprise systems focused on credit operations, financial management, industrial maintenance and import processes (COMEX).

  • Development of modules for proposal management, affiliates, commissions and financial workflow, including calculation rules, status control and reporting.
  • Implementation and maintenance of service order control, asset management and operational indicators.
  • Development of import control modules for requests, shipments, logistics costs and pre/post-shipment rules.
  • Bank remittance generation, financial processing and CNAB layout integrations.
  • Development of REST APIs and Razor Pages interfaces following layered architecture.
  • SQL Server modeling and optimization, including Stored Procedures and performance tuning.

Main stack: .NET 8/10, ASP.NET Core, Razor Pages, Dapper, EF Core, SQL Server, Modular JavaScript and Bootstrap.

Vibe Tecnologia

.NET Software Analyst - July 2021 - 2024

Belém - PA, Brazil

  • Design and development of web, mobile and desktop applications using .NET, C#, HTML, CSS, JavaScript, Blazor, MAUI, Xamarin.Forms and Azure.
  • Product integrations within microservices-oriented architectures.
  • Participation in design, architecture and peer code review decisions with the team.

Aptus Tecnologia em Informação

Junior .NET Developer - October 2019 - June 2021

Campinas - SP, Brazil

  • Maintenance and evolution of web/mobile reimbursement and expense management systems built with VB.NET, .NET, C#, Xamarin.Forms and Cordova.

Parque Tecnológico de Sorocaba

Software Development Intern - February 2019 - October 2019

Sorocaba - SP, Brazil

  • Contributed to public administration web/mobile systems using JavaScript, HTML, jQuery, PHP, MySQL, C#, React Native and Xamarin.Forms.

About

Fullstack .NET Developer with experience in the architecture and evolution of enterprise-grade systems, involving complex financial rules, integrations, data processing and bank remittance generation. Strong experience with ASP.NET Core, Razor Pages, Dapper, EF Core and SQL Server, focused on clean architecture, query optimization and code quality. Graduated in Systems Analysis and continuously improving in software engineering best practices.

Profile picture of Matheus Oliveira Full Stack .NET Developer

Full Stack .NET Developer

Birth:
23/05/1989
City:
Campinas - SP
Country:
Brazil
Age:
37 years
Education:
Systems Analysis and Development

Business presence

Professional operation through a formal technology company focused on custom software development.

M & Y Tech logo

M & Y Tech

Technology company based in Campinas, Brazil, specialized in the development and licensing of customizable software systems, focused on tailored web solutions, system integration, process automation, and sustainable digital product evolution.

Registration status: Active
Legal name
M.Y. Soluções em Tecnologia Ltda
CNPJ
61.894.394/0001-63
Opening date
07/24/2025
Legal nature
Limited Liability Company
Main activity
Development and licensing of customizable software
CNAE
6202-3/00
Headquarters
Campinas/SP