I'm Francisco Sá, a senior full-stack engineer passionate about transforming complex business challenges into scalable, production-ready systems. I focus on AI integration in the health care and finance industries. I have hands-on expertise in building large-scale full-stack systems integrated with GenAI frameworks such as LangChain, LlamaIndex, and LangGraph. I'm proficient in DevOps, cloud infrastructure, security, and data privacy.

Francisco Sá

I'm Francisco Sá, a senior full-stack engineer passionate about transforming complex business challenges into scalable, production-ready systems. I focus on AI integration in the health care and finance industries. I have hands-on expertise in building large-scale full-stack systems integrated with GenAI frameworks such as LangChain, LlamaIndex, and LangGraph. I'm proficient in DevOps, cloud infrastructure, security, and data privacy.

Available to hire

I’m Francisco Sá, a senior full-stack engineer passionate about transforming complex business challenges into scalable, production-ready systems. I focus on AI integration in the health care and finance industries.

I have hands-on expertise in building large-scale full-stack systems integrated with GenAI frameworks such as LangChain, LlamaIndex, and LangGraph. I’m proficient in DevOps, cloud infrastructure, security, and data privacy.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Language

English
Fluent

Work Experience

Senior AI Engineer at Allia Health Group
October 1, 2025 - October 1, 2025
Developed AI-driven automated HR and finance workflows on the company's cloud platform, streamlining business operations. Automated commission calculations and new-hire onboarding using n8n and UiPath, deploying a cloud-based RPA solution that reduced manual effort by approximately 6 hours per week.
Senior AI Engineer at Cresta
August 1, 2024 - August 1, 2024
Led AI model training and optimization initiatives, delivering high-performance solutions and reducing deployment time. Optimized a BAR K model with ONNX, TensorRT and NVIDIA Triton, achieving a 10x reduction in response time for Voice AI Agent development. Trained a diffusion-based TTS model with parallel data loading and distributed computing to improve training efficiency. Built Color Expert Agent using AWS Bedrock and a RAG pipeline with LangChain, LangGraph, LangIndex, OpenAI API, and Pinecone, boosting color analysis accuracy and workflow efficiency.
Senior Full-Stack Engineer at Cresta
September 1, 2021 - August 1, 2024
Build a comprehensive internal EHR system to manage patient records, documents, scheduling, billing, and clinician workflows. Automated commission calculations and onboarding using n8n and UiPath, deploying a cloud-based RPA solution that reduced manual effort by approximately 6 hours per week. Implemented a RAG pipeline using LLM APIs (OpenAI, Google Gemini) to manage dependent HR onboarding data and complex financial logs with context-aware automation, enhancing data accuracy by 91% and eliminating manual errors. Deployed secure, scalable AI workflows on cloud infrastructure in collaboration with cross-functional teams, ensuring high performance and adherence to enterprise compliance standards. Implemented CI/CD and observability using GitHub Actions, Docker, AWS ECS, Grafana, and Prometheus, achieving 95% automated deployment coverage and reducing manual release checklist items. Optimized frontend and API performance, profiling and introducing targeted caching and batching to improv
Full Stack Developer at Doximity
July 1, 2017 - August 1, 2021
Developed internal company sites and outsourced projects for B2B clients, specializing in full-stack web development, AI-driven solutions, and data-driven optimization. Designed and delivered an AI-powered agent platform that scrapes data to provide real-time insights into SAP suppliers, enhancing client decision-making. Leveraged BERT and PyTorch to drive a 32% increase in customer conversions for an e-commerce client by delivering tailored product suggestions based on user behavior. Optimized revenue by 20% for a global retail chain with more competitive and personalized pricing strategies. Used React, Node.js, and TypeScript to create robust, scalable solutions that streamline operations and improve user engagement.

Education

Bachelor of Science at University of Texas Rio Grande Valley
September 1, 2012 - May 1, 2016
Bachelor of Science in Computer Science at The University of Texas Rio Grande Valley
September 1, 2012 - May 1, 2016

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services, Media & Entertainment, Healthcare, Financial Services