Christian Rafael de Souza Silva

Information Systems Programmer — ITB Equipamentos Elétricos

Birigui, SP, Brazil

• Internal management system covering finance, accounting, production planning and engineering.
• C++, MySQL and Delphi; Horse APIs and Swagger documentation.
• .NET Core, EF Core, C#, JavaScript, React and PostgreSQL.
• DDD, CQRS, layered architecture and automated testing.
• Maintenance and extension of production systems, application APIs and automated testing.

Full Stack Developer — Gigatron Franchising / Dotbank

Birigui, SP, Brazil

• PHP, Laravel, Angular, Vue and PostgreSQL; Android apps in Java/Kotlin and hybrid React/Ionic apps.
• APIs and products for ZIP code lookup, SMS, food delivery, retail automation, fiscal documents and ticketing.
• Linux/Windows Server administration; DigitalOcean, AWS and Cloudflare.
• Delphi application for production sheet stacking and printing.

Full Stack Developer — Netstart Informática

Birigui, SP, Brazil

• Retail automation with Delphi/PostgreSQL and SAT fiscal queue processing with Redis.
• Desktop updater; PHP/CodeIgniter API and panel with jQuery and PostgreSQL.
• Internal tools, Bash scripts and cloud storage/querying of fiscal documents.

Full Stack Developer — Gigatron Franchising

Birigui, SP, Brazil

• PHP/MySQL applications, server administration and SMS service using Python with a modem.

Programmer Apprentice — Assessor Público (MV & P Tecnologia)

Araçatuba, SP, Brazil

• GeneXus applications, R&D, AWS server administration and OpenVPN.

Programmer Apprentice — Gigatron Tecnologia

Birigui, SP, Brazil

• Internal applications in Delphi.

ChrisOS

Experimental operating system and low-level playground for kernels, compilers, toolchains, virtual machines, emulators, drivers and graphics subsystems. GitHub · Documentation

Chris-GPT-2

124M-parameter GPT-2 trained from scratch on ~10B FineWeb-Edu tokens using 4× A100 GPUs, with SafeTensors/GGUF exports. GitHub · Hugging Face

Chris-Llama

Experimental LLM inference runtime in C covering GGUF, tokenization, attention, KV cache, quantization and CPU/GPU execution. GitHub

Chris-Torch

Deep learning framework built from scratch with tensors, autograd, neural-network components, optimizers and accelerated backends. GitHub

Velis

Collaborative workspace with device-local changes and multi-device synchronization. Product

Chris Cleaner

C#/.NET desktop application for disk analysis, background file cataloging and user-controlled cleanup. Product

Engineering Manual

Open, bilingual computer science and software engineering reference with full-text search, structured study tracks, editorial checks and automated static publishing. Website · GitHub

Domine a Guitarra

Free interactive guitar-learning platform built with Astro and TypeScript, featuring chord diagrams, tablature playback, ear training and Web Audio synthesis. Website

SharpEx

Market and portfolio-intelligence workspace with multiple portfolios, risk/return metrics, crypto, market data and structural research integration.

Marginal Thinking

Independent macroeconomics, markets and geopolitics research platform with recurring reports, structural datasets and primary-source analysis. marginalthinking.org