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GuiMayer/README.md

Guilherme Mayer

Junior software developer focused on C#/.NET, REST APIs, and automated testing, with experience in TypeScript, React, and PostgreSQL. Currently supporting enterprise ERPs at WLE Soluções and studying Systems Analysis and Development at IFPR.

I’m also interested in game development, particularly gameplay programming and rules engines built with C# and Godot.

Curitiba, Brazil · Open to remote opportunities · Fluent in English

  • ERP Pousada — Hospitality management ERP inspired by real operational workflows: reservations, point of sale, inventory, and blind cash reconciliation. Built with Next.js, TypeScript, PostgreSQL, and Prisma. Live app
  • HeroScript — Deterministic C#/.NET 10 rules engine with an ASP.NET Core REST API, 60+ endpoints, immutable state, Docker, and a Godot client. 1,420+ xUnit tests.
  • MM3E Character Builder — Open-source React/TypeScript RPG character builder with rules validation and a power editor. 1,050+ Vitest tests and ~100 daily visits. Live app

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  1. HeroScript HeroScript Public

    C#/.NET rules engine with an ASP.NET Core REST API, deterministic execution, immutable state, persistence, and a playable Godot client.

    C#

  2. erp-pousada erp-pousada Public

    Hospitality ERP in active development: reservations, point of sale, inventory, financial management, permissions, and audit logs. Next.js, TypeScript, Prisma, PostgreSQL.

    TypeScript

  3. mm3e-builder mm3e-builder Public

    Modern character builder for Mutants & Masterminds 3e with drag-and-drop powers, automatic validation, and official PDF export

    TypeScript 2 1