VVítor Henrique
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Vítor Henrique Santos Reis

Full Stack Developer

Summary

I'm a Full Stack Developer with over 6 years of experience building scalable, high-performance web applications. I work primarily with C#, .NET Core and Entity Framework, with a strong track record in integrating complex systems.

I move with equal depth between two ecosystems: C# / .NET with Angular and Blazor, and Node.js with React. On top of that, Python automation, relational and non-relational databases, and deep expertise in compliance-heavy billing — invoices filed with government tax authorities and payment slips issued through bank APIs.

Today I act as the technical reference for a development team: running code reviews, supporting architecture decisions and mentoring developers early in their careers.

Technologies

Back-end
C# · .NET 8 / .NET Core · ASP.NET Core · Entity Framework · Node.js · Express · REST APIs
Front-end
React.js · Angular · Blazor · TypeScript · JavaScript · Tailwind CSS
Integrations
E-invoicing (tax authorities) · Bank APIs (payment slips) · Third-party APIs · RabbitMQ · SignalR
Python & automation
Python · FastAPI · OCR (Tesseract) · OpenCV
Data
SQL Server · PostgreSQL · MongoDB · Data modeling
Infrastructure
Docker · Linux · AWS (EC2) · IIS · Windows Services · Quartz (job scheduling) · Serilog · Swagger / OpenAPI
Architecture & quality
Clean Architecture · DDD · Microservices · SOLID · Testing with xUnit · Code review
Practices
Git · Scrum / Kanban · Technical mentoring · Requirements gathering
Legacy
VB6 · Crystal Reports · Migration to .NET

Work experience

Software Development Consultant — Head5 Engenharia

Oct 2025 — Present

Direct hire since Apr 2026 · started via Tarso Tecnologia · Belo Horizonte, Brazil · Hybrid

  • The team's only senior developer, acting as technical reference for one junior developer and two interns: code review, architecture decisions and mentoring.
  • Built the OCR document reader in Python, replacing the manual checking of technical PDFs — around a week of work per month cut down to a few hours of review.
  • Deployed the OCR service on an Ubuntu server and the .NET applications on IIS on the company's own server.
  • Designing new features as microservices, with domain-driven modeling (DDD) and REST APIs between them.
  • Unit and integration tests with xUnit on critical modules, checked during code review.
  • Analyzing, specifying and implementing custom enterprise solutions.
  • Continuously improving internal development processes.

Systems Analyst — Siematec Informática

Aug 2025 — Oct 2025
  • Maintained and evolved a deep-legacy VB6 system with Crystal Reports, including interoperability with newer modules written in C#.
  • Built integrations between the legacy system and modern platforms, prioritizing scalability and reliability.
  • Migrated features to newer technologies and automated previously manual processes.
  • Modeled the new C# modules with DDD, isolated from the legacy code as independent services.
  • Automated tests with xUnit on the new modules, creating a safety net for the gradual migration.
  • Supported the technical team in requirements analysis and production troubleshooting.

Full Stack Developer — Globalrv Rastreamento Ltda

Jan 2024 — Aug 2025
  • Built the company's automated billing pipeline: the system reads each contract and the fleet attached to it, issues the payment slip through the bank's API and files the tax invoice with the Belo Horizonte tax authority — one flow, no manual step.
  • Around 3,000 tax invoices filed per month in internal use, with the pipeline sized well above that.
  • Integrated the APIs of three banks (Inter, Itaú and Bradesco) to issue and track payment slips.
  • Maintained and evolved the freight (CT-e OS) and invoicing systems in C#, .NET Core and Entity Framework, keeping compliance intact through every rule change from the tax authority.
  • Split the system into independent services using DDD, isolating the billing, fleet and tax-filing domains.
  • Unit and integration tests with xUnit on the tax and banking routines, where a production failure means an invoice filed wrong.

Full Stack Developer — Freelance

Mar 2020 — Jan 2024
  • Delivered web solutions for clients across several industries, focused on robust and scalable applications.
  • Built a balance-lookup platform for the Brazilian severance fund (FGTS), unifying four third-party APIs.
  • Created a service with advanced financial data lookup features.
  • Hosted and maintained the applications on AWS EC2 instances: provisioning, deployment and monitoring.
  • Developed company websites applying front-end and back-end best practices.

Projects

NotaFácil — app.notafacil.api.brOwn product

A tax-document platform of my own: Brazilian service invoices (NFS-e, national gov.br standard) and freight documents (CT-e OS, model 67) in a single panel, talking straight to the tax authority's web services with no middleman in between. Genuinely multi-company — each company keeps its own numbering and its own A1 certificate, encrypted at rest —, a customer book that fills itself on every issue, lookup and cancellation by access key, and the same REST API that drives the panel exposed for ERP integration.

C# · .NET Core · React · TypeScript · NFS-e / CT-e OS · REST API

OCR document readerHead5 Engenharia

A system that reads technical PDF documents on its own — including scanned pages, which to a computer are nothing but photos. It locates the tables inside the file, recognizes the text and returns the data already structured. Checking that used to consume about a week per month, page by page, now runs in minutes and comes down to a few hours of review.

Python · FastAPI · OCR (Tesseract) · OpenCV

SGTrack — sgtrack.com.br

Fleet tracking platform covering roughly 10,000 vehicles, with automated billing: it reads the contracts, issues the payment slip through the bank's API and files the tax invoice with the authority in a single flow.

C# · .NET Core · Entity Framework · SQL

Consulta Saque — consultasaque.com.br

Balance-lookup platform for the Brazilian severance fund (FGTS), unifying four third-party APIs into a single flow with failover between providers.

React.js · Node.js · Integrations

API FGTS — apifgts.com.br

Service exposing advanced financial data lookup features, designed to be consumed by other applications.

Node.js · REST API · MongoDB

GN Engenharia — gnengenhariamanutencao.com.br

Company website built from scratch, focused on performance, responsiveness and front-end and back-end best practices.

React.js · CSS3 · SEO

Education

B.Sc. in Information Systems

In progress

Centro Universitário Newton Paiva · since Jun 2025

Technical degree in Web Development

2020 — 2021

FATEC SENAI Belo Horizonte · on hold

Additional courses: Alura — Entity Framework Core, .NET Core, Bootstrap 4 · Udemy — React + Redux, Modern Web 2022, OOP in Java