Open to opportunities

Francisco Sa

@franciscosa

Message

Senior AI full-stack engineer building secure, scalable GenAI systems for healthcare and finance.

Portugal

Message

What I'm looking for

I seek roles applying GenAI to real-world systems in secure, regulated environments with strong DevOps, clear impact, and collaborative teams.

I’m a Senior AI Full-Stack Engineer focused on transforming complex business challenges into scalable, production-ready systems, with deep experience integrating GenAI into healthcare and finance environments.

I have built HIPAA-compliant EHR platforms and AI-driven automation for HR and finance, deploying RAG pipelines with OpenAI and Google Gemini, production microservices, CI/CD, and cloud infrastructure that improved accuracy, performance, and developer velocity.

I prioritize security, data privacy, and pragmatic DevOps practices, and I deliver measurable results—reducing manual effort, improving accuracy, and optimizing system reliability across clinical and enterprise workflows.

Experience

Work history, roles, and key accomplishments

Senior AI Engineer

MentalSpace Therapy

Sep 2024 - Oct 2025 (1 year 1 month)

Developed AI-driven automation for HR and finance, deploying cloud RPA and RAG pipelines that reduced manual effort by ~6 hours/week and improved data accuracy by 91%. Implemented secure, scalable AI workflows meeting enterprise compliance standards.

LlamaIndex OpenAI API Cloud Implementation RAG Data Privacy APIs Robotic Process Automation

Senior Fullstack Engineer

Cresta

Sep 2021 - Aug 2024 (2 years 11 months)

Architected and delivered a HIPAA-compliant full-stack EHR using Nest.js, React, PostgreSQL and AWS supporting 2,000+ patient records; refactored services into microservices reducing median API latency by ~9% and achieved 95% automated deployment coverage.

React PostgreSQL AWS Microservices CI CD Grafana Prometheus HIPAA NestJS

AI Fullstack Developer

Doximity

Jul 2017 - Aug 2021 (4 years 1 month)

Built AI-driven B2B web solutions and internal platforms, using BERT and PyTorch to increase conversions by 32% and optimized pricing strategies to grow revenue by 20% for clients.

React Python PyTorch BERT Web Scraping