Fabiano Calado
Verified Expert in Engineering
Full-stack Developer
Campinas - State of São Paulo, Brazil
Toptal member since May 14, 2026
Fabiano is a full-stack and AI engineer with experience designing and deploying production-grade LLM systems. He combines GPT/Gemini, RAG, vector databases, and data pipelines to build intelligent products. With 10+ years of experience in full-stack development and data engineering, he has focused on end-to-end AI applications through a goal-oriented approach.
Portfolio
Experience
- TypeScript - 9 years
- Python - 9 years
- CI/CD Pipelines - 4 years
- NestJS - 4 years
- Databricks - 4 years
- FastAPI - 3 years
- LangGraph - 1 year
- RAG Systems - 1 year
Preferred Environment
LangGraph, NestJS, React, CI/CD Pipelines, Prefect, Node.js, FastAPI, Databricks, Terraform, RAG Systems
The most amazing...
...work I've done involved performing platform query optimization, reducing the AWS bill from $10,000 to $3,000.
Work Experience
Node.js/React Developer
Singularity Intelligence Systems LLC
- Built architecture and guardrails for a multi-modular mortgage AI platform, applying tenant isolation and enabling agentic development of an MVP to raise a $2 million seed.
- Developed test suites, code review, identified and fixed 400+ flaws.
- Set up guidelines for RAG to enable the main product to be replicable.
Senior AI and Full-stack Engineer
Pyyne
- Built a multi-agent AI platform (8 agents, LangGraph, RAG) to aggregate and analyze public company data, generating automated investment reports for a PE firm, cutting manual analysis time from weeks to hours.
- Designed and deployed a GPT-powered natural language BI platform on GCP, enabling non-technical users to query business data via LLMs, avoiding an estimate of $300,000 per year in analytics hiring costs.
- Built an AI app to generate patient cases and questions to educate doctors about a specific drug. The app replicated human research, decreasing the time to create each case from 3 months to 1 month.
- Led the creation of an AI platform for a marketing startup that gathered clients with a total revenue of $500+ million in the 1st year.
- Optimized queries on an ETL pipeline, decreasing the AWS costs from $10,000 to $3,000.
Full-stack Developer, Tech Lead
CECONTE Treinamentos Profissionais
- Led development of a scalable e-learning platform serving 3,000+ students with integrated payments and automation.
- Built internal systems that tripled sales team productivity through CRM optimization and workflow automation.
- Collaborated with marketing and product teams to support 250% business growth through data-driven decision-making.
Data Scientist
Bemaker
- Developed machine learning models and taught applied ML concepts as an instructor.
- Achieved the top 1% ranking in a Kaggle competition.
- Contributed to business strategy and built the financial plan for startup growth.
Data Analyst, Branch Manager
WM Manhattan Investments
- Built data-driven customer insights and analytics systems, increasing customer satisfaction from 17% to 74% in 6 months.
- Developed dashboards and AI-based pattern detection tools to inform product and business decisions.
- Managed a branch with sales and operations teams, growing the branch's revenue by 100%.
Operations Technician | Product Owner
Petrobras
- Gathered operational requirements and translated complex industrial workflows into technical specifications, ensuring alignment between field operations and engineering implementation.
- Led the modernization of the industrial automation platform as product owner, translating operational requirements into technical implementation and reducing system failure rates by 66%.
- Oversaw the development and deployment of a new operational unit’s automation system, coordinating technical requirements and implementation efforts that increased power output by 40%.
Experience
Multi-agent RAG Platform for Financial Analysis
Marathon Data
https://marathondataco.comRAG System
https://github.com/caladoxd/RAG-systemMedGPT
Education
Bachelor's Degree in Computer Science
University Center of Belo Horizonte (UniBH) - Belo Horizonte, Brazil
Associate's Degree in Electromechanics
Federal Center for Technological Education (CEFET) - Belo Horizonte, Brazil
Skills
Libraries/APIs
React, Node.js, PySpark, OpenAI API, OpenAPI, REST APIs, API Development, Azure API Management, QuickBooks API, Stripe, Google Drive API, Claude API, Google Places API
Tools
Terraform, ChatGPT, Prisma, Observability Tools, Prefect, Claude, BigQuery, Claude Code, Docker Compose, Zoom, Apache Airflow, Tableau, AWS Cloud Development Kit (CDK), SendGrid, Figma, Windsurf
Languages
TypeScript, Python, SQL, Google Apps Script, JavaScript, HTML, Python 3, GraphQL, Bash, Bash Script, CSS
Frameworks
NestJS, Data Lakehouse, Express.js, Swagger, JSON Web Tokens (JWT), Agentic Frameworks, LangGraph, Next.js, Tailwind CSS, Jest, OAuth 2, gRPC, Vanilla JS
Paradigms
Database Design, Microservices, Role-based Access Control (RBAC), Scalable Application, API Architecture, Automation, DevOps, Automated Testing, Event-driven Architecture, Continuous Delivery (CD), Continuous Integration (CI), REST, HIPAA Compliance, Scrum, Agile, Management, Testing, Azure DevOps, Objectives & Key Results (OKRs), Model Context Protocol (MCP)
Platforms
Databricks, Amazon Web Services (AWS), Azure, Docker, Cloud Run, Cloud Native, Azure Functions, Google Cloud Platform (GCP), LangSmith, Linux, Apache Kafka, Salesforce
Storage
Databases, PostgreSQL, Data Pipelines, Relational Databases, Data Lakes, Redis, MySQL, MongoDB, NoSQL, Google Cloud, Redshift
Industry Expertise
Project Management, Healthcare
Other
CI/CD Pipelines, FastAPI, Software Development, LLM Integration, LangChain, Architecture, Leadership, Linear, Prompt Engineering, Agentic AI, Artificial Intelligence (AI), Full-stack, Generative Artificial Intelligence (GenAI), Minimum Viable Product (MVP), Product Management, AI Automation, Agentic AI Systems, API Integration, Communication, RESTFul APIs, AI Agents, Cloud, Large Language Models (LLMs), Back-end Development, API Design, AWS Secrets Manager, Documentation, Cursor AI, Integration, Scalable Architecture, Scalable Platforms, Agentic Coding, Full-stack Development, Software Architecture, APIs, Solution Architecture, AI Development, Cloud Infrastructure, Scripting, API Testing, Back-end, AWS Cloud Architecture, Debugging, Troubleshooting, Security, AI Integration, Finance, Software Design, Third-party APIs, AI-assisted Development, Agentic RAG Systems, RAG Architecture, Retrieval-augmented Generation (RAG), AI Tools, AI Architecture, Technical Consulting, Solution Design, Wealth Management, Error Handling, Remote Work, Design Systems, AI Copilots, Code Review, Team Leadership, Interviewing, SaaS, Multi-agent Orchestration, AI-generated Code, Integrations, Reviews, LLM Agents, Infrastructure Automation, AWS DevOps, DevOps Automation, DevOps Engineer, Cloud Engineering, Platform Engineering, Software Engineering, Web Development, Technical Architecture, Training, Multi-tenant Architecture, Distributed Systems, Conversational AI, Payment APIs, MVP Design, Mentorship, Front-end Development, RESTful Web Services, Engineering Management, System Architecture, Agentic Workflow Design, Event-driven Systems, Large Language Model Operations (LLMOps), Attention to Detail, Written Communication, Deployment, Infrastructure, Startups, Product Mindset, Systems Design, Monitoring, Infrastructure as Code (IaC), RAG Systems, OpenAI, Data Engineering, Lambda Functions, IT Governance, Machine Learning, Key Performance Indicators (KPIs), Embeddings from Language Models (ELMo), Electrical Engineering, Mechanical Engineering, Vector Databases, Model Evaluation, Technical Leadership, AI Agent Orchestration, Tailwind UI, API Gateways, Fintech, Product Owner, Industrial Automation, Product Development, Payments, Compliance, Gemini API, Vibe Coding, Vite, Product Listings, Finance APIs, Financial APIs, Financial Data, CAG, HIPAA, Financial Services, User Experience (UX), User Interface (UI), Screeners, Team Management, Energy, Front-end, Product Ownership, Reliability Engineering, Education Technology (Edtech), Workflow Automation & System Integration, Email Automation, Billing, Payment Processing, Dashboard Development, Healthtech, Medical Software, Data Modeling, Gemini, Team Mentoring, Data Analysis, CRM, Linear Regression, Milvus, OPC Data Access, OPC Server, IT Security, DocuSign, Supabase, Venture Capital, Regulated Industries, Mortgages, OpenAI GPT-3 API
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