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Guilherme Fortuna dos Santos

@guilhermefortuna

Software developer focused on Python, TypeScript and backend systems, with experience building SaaS, automation and data-driven products.

Brazil

Message

I’m a software developer with experience across backend engineering, automation, data processing and SaaS products. I work primarily with Python and TypeScript, and I’m also comfortable with SQL, PostgreSQL, Redis, Docker, Linux, REST APIs and cloud tooling.

Professionally, I’ve worked on insurance compliance software, building parsers, automation tools, testing infrastructure and internal developer workflows. Outside work, I build full-stack and systems projects involving trading platforms, SaaS applications and AI-assisted developer tooling.

I enjoy solving practical engineering problems, learning quickly and working independently in remote teams. I’m based in Brazil, fluent in English and Portuguese, and currently looking for a remote software engineering role where I can contribute quickly and continue growing.

Experience

Work history, roles, and key accomplishments

Current

Multi-Tenant Clinic Management SaaS

Current

Independent

Jan 2026 - Present (9 months)

Architected an AI-assisted, multi-tenant dental clinic management platform with role-based tenant data isolation, appointment scheduling, and automated clinical workflows.

React TypeScript fastAPI PostgreSQL Multi tenancy AI

Current

Quantitaive analyst / Trader

Current

Self-employed

Mar 2020 - Present (6 years 7 months)

Using Python for extraction and analysis of financial market data in order to conceptualize, develop, and test operational strategies for investments and financial speculations.

Current

Quantitative Research & Execution Platform

Current

Independent

Mar 2020 - Present (6 years 7 months)

Developed a desktop quantitative research and backtesting platform using Python/FastAPI, React/TypeScript/Tauri, PostgreSQL, and Parquet for market-data ingestion, interactive charting, and paper execution. Built distributed parameter discovery pipelines using Optuna and evolutionary algorithms over Redis/Dramatiq worker pools.

Python fastAPI React TypeScript Tauri PostgreSQL Parquet Optuna Redis Dramatiq Backtesting

Software Developer / Integration & Data Platforms (Remote)

BRXBet & RicoBet

Sep 2025 - Jul 2026 (10 months)

- Owned the design and implementation of multiple service integrations within the company’s consolidation platform, connecting internal systems and external providers under operational and regulatory constraints.

- Built and maintained data pipelines, API integrations, and background services used for analytics, reporting, and compliance workflows.

- Led the development of GoSIGAPP, a production

Software Developer — Integrations & Data Platforms

BRXBET & RICOBET

Sep 2025 - Jul 2026 (10 months)

Architected and deployed a production Go microservice for Brazilian regulatory compliance (SIGAP) with mTLS, RSA-SHA256 signing, and XML validation. Engineered a full-stack fraud investigation platform using FastAPI, PostgreSQL, Databricks, and Redis, and built integration services for gaming platforms, payment providers, and government endpoints.

Go fastAPI PostgreSQL Databricks Redis AWS ECS Fargate S3 EventBridge Docker mTLS RSA SHA256 X509 XML ETL CI CD

Data Analyst

Jones Software

Feb 2025 - Sep 2025 (7 months)

Worked as Data Analyst at Jones Software.

Software Developer / Data Analyst

Jones Software

Jul 2024 - Sep 2025 (1 year 2 months)

Built Python ingestion pipelines converting unstructured OCR output from insurance certificates into validated, structured datasets for compliance audits. Developed LLM verification and evaluation tooling in Python and Node.js, and automated test suites with Pytest integrated into AWS S3 and Jenkins CI pipelines.