Hi, I'm
João Vitor Martins
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I transform data into strategic decisions. With over 10 years of experience, I help companies build robust data infrastructures that generate real business impact.
About
Nice to meet you! You can call me JV.
I've been working with data for over 10 years, and if you take a closer look at my profile, you'll find a wide range of valuable experience across different industries - from healthcare and pharma to automotive and manufacturing.
I'm passionate about solving problems and delivering practical solutions to various challenges. Currently, I work as Lead Data Engineer at Medtronic (USA) and also run my own consulting company, DadosNow, where I help companies transform their data into competitive advantage.
Beyond data infrastructure, I also build AI-powered products. JARVIS is a live example — an AI personal assistant with persistent memory, multi-model support (GPT, Claude, Gemini) and WhatsApp integration, built entirely from scratch. I believe the future of data engineering is inseparable from AI — and I'm already building it.
My expertise spans Data Architecture, Data Engineering, BI & Analytics, and Cloud Solutions. I've worked with companies like Novartis, Hospital Sírio-Libanês, Shoulder, Embraer, Ford, and Fleury.
I hold a Master in Data Science and AI from Sirius Educação (MBA).
Languages
Stack & Skills
Data Engineering
- Python
- SQL
- Snowflake
- Databricks
- AWS Glue
- Pentaho
- ETL/ELT
- Dataflows Gen2
Data Architecture
- Data Lake
- Data Warehouse
- Data Modeling
- Snowflake
- AWS Redshift
- SAP Integration
- Row-Level Security (RLS)
BI & Analytics
- Qlik Sense
- QlikView
- Power BI
- Tableau
- Qlik Cloud
- NPrinting
- Microsoft Fabric
- DAX
- Direct Lake
- TMDL
- Tabular Editor
- Power Query (M)
- DirectQuery
- Import Mode
- Performance Analyzer
- XMLA Endpoint
- DAX Studio
- Microsoft Fabric Lakehouse
Cloud & Tools
- AWS
- GCP
- Snowflake
- Alteryx
- SAP BW/4HANA
- Oracle
AI & LLM
- OpenAI API
- Claude API
- Gemini API
- LLM Integration
- AI Product Development
- RAG Systems
DevOps & CI/CD
- Git
- Power BI Projects (PBIP)
- Deployment Pipelines
Security & Governance
- Sensitivity Labels
- Object-Level Security (OLS)
- Data Governance
Experience
Professional journey and impacts generated across industries
Medtronic
Lead Data Engineer
Jun 2025 - Present · United StatesLeading data engineering initiatives at one of the largest medical technology companies in the world.
Key Contributions:
- Creating and managing pipelines in Snowflake environment
- Designing semantic models with star-schema patterns for dimensional analysis
- Building dataflows in Power BI with Microsoft API integrations
- Implementing Row-Level Security (RLS) and data governance policies
- Connecting SAP tables (SAP BW, SAC, Datasphere) - Creating FACT and DIM tables
- Leading Data Engineering for Operations Innovation team
- Performance tuning using DAX optimization and external tools
DadosNow
IT Director / Solutions Architect
Nov 2021 - Present · São Paulo, BrazilFounder and director of my own consulting company, delivering data solutions to enterprise clients.
Key Contributions:
- Prime Energy (Shell Company) - Data Architect: Designed complete Data Lake architecture using Medallion model (Bronze/Silver/Gold)
- Shoulder (Fashion Retail): Data architecture and analytics solutions
- Solidaridad: Designed and implemented new Data Lake architecture with AWS Glue and Athena
- Fleury: Led restructuring and unification of environments after merger
- Ford LATAM: Delivered analytics solutions for global teams
- Vipal: Managed QlikView environments, reducing contract costs
Novartis Brasil
Data Architect
Jul 2023 - Jun 2025 · São Paulo, BrazilSolution Architect leading global data projects and managing BI environments.
Key Contributions:
- Led implementation of global data project using Snowflake
- Collaborated with global team to make new data available across systems
- Managed Qlik Sense and Power BI environments
- Developed market distribution monitoring applications
- Processed and optimized IQVIA data with local business rules
Hospital Sírio-Libanês
Data Specialist
Oct 2021 - Jul 2023 · São Paulo, BrazilLed innovative BI projects and cloud migrations at one of Latin Americas top hospitals.
Key Contributions:
- Led development of BI projects using Power BI and Qlik Sense
- Planned and executed QlikView/Qlik Sense server migrations
- Oversaw complete migration from QlikView/Qlik Sense to Power BI
- Designed new table structures in AWS Redshift as Data Engineer
- Led intercloud migration from AWS to Oracle Cloud Infrastructure (OCI)
Shoulder
Business Analyst
Jul 2021 - Apr 2023 · São Paulo, BrazilLed strategic development of BI applications at one of Brazil's largest fashion retailers.
Key Contributions:
- Led strategic development of QlikView and Qlik Sense applications
- Managed full project lifecycle from concept to delivery
- Administered Qlik servers ensuring performance and reliability
- Designed and implemented automation processes in SQL and Qlik
- Built CRM structure for targeting potential clients
SONDA
Analytics Senior
Sep 2019 - Jul 2021 · São José dos Campos, BrazilTech Lead at consulting firm specialized in Qlik, responsible for project prioritization and delivery.
Key Contributions:
- Embraer/Boeing Carveout: Led Qlik environment split and data cleaning
- MFA Server Consolidation: Unified 48 AD MFA servers in 5 days (planned for 3 months)
- Designed ETL processes using Pentaho for complex Data Warehouse environments
- Delivered data integration projects using SAP ECC/4HANA tables
- Built Power BI dashboards with real-time SQL integrations
Uniodonto São José dos Campos
Business Data Analyst
Dec 2018 - Sep 2019 · São José dos Campos, BrazilLed BI initiatives and process optimization at one of the largest dental cooperatives in the region.
Key Contributions:
- Developed applications and KPIs using QlikView and Qlik Sense
- Administered QlikView and Qlik Sense servers
- Led process optimization initiatives using QlikView
- Delivered a high-impact project generating R$ 250,000 in immediate business value
Embraer
IT Intern (Data Analyst)
Oct 2017 - Dec 2018 · São José dos Campos, BrazilStarted my data career at one of the world's largest aircraft manufacturers.
Key Contributions:
- Developed BI applications using QlikView
- Managed and supported Oracle Databases
- Created automation robots in VBS and C#
- Supported PHP and JavaScript portal development
Projects
Key projects delivered and measurable results achieved
JARVIS — AI Personal Assistant
A complete AI personal assistant with persistent memory across conversations, multi-model support (GPT, Claude, Gemini), document uploads and WhatsApp integration. Built from scratch and live in production.
Result: Try it free at usejarvis.app
View Product →
Global Data Platform - Snowflake
Led implementation of enterprise data platform at Novartis, integrating global data sources and enabling cross-system analytics.
Result: Unified data access for global teams
Data Lake Architecture - AWS
Designed the complete technical solution and led the implementation of a new Data Lake architecture for Solidaridad.
Result: End-to-end technical design and implementation
Fleury + Pardini Merger
Led the restructuring and unification of Qlik Sense and Qlik Cloud environments after the merger.
Result: Unified analytics environment post-merger
MFA Server Consolidation
Successfully unified 48 Active Directory MFA servers into a single environment at SONDA/Embraer.
Result: Delivered in 5 days (planned for 3 months)
Ford LATAM Analytics
Developed unified KPI dashboard for dealerships across Brazil and Argentina.
Result: Analytics for global teams BR/AR
Cloud Migration AWS to OCI
Led intercloud server migration from AWS to Oracle Cloud Infrastructure at Hospital Sírio-Libanês.
Result: Seamless migration with high availability
Blog & Articles
Sharing knowledge about data, architecture, and engineering
JARVIS — Building a Brazilian AI Personal Assistant from Scratch
How I built a complete AI personal assistant from scratch — persistent memory, multi-model support (GPT, Claude, Gemini) and WhatsApp integration. From idea to production.
Using Dataflows for Cost Reduction and Governance
How I leverage Microsoft Dataflows to centralize queries, reduce costs on Databricks/Snowflake, and enable governance.
Performance Optimization: From 8 Hours to 6 Minutes
How I reduced a Power BI Dataflow load time from 8 hours to just 6 minutes.
How a Data Crisis Became an Architecture Journey
A consulting case where data divergence caused trust issues. The solution: a complete Data Lake redesign.
Trusted By
Companies I've worked with
How We Can Work Together
Flexible partnership models to meet your needs
Why work with me?
+10 Years Experience
Extensive experience across healthcare, pharma, automotive, and manufacturing industries.
Enterprise Track Record
Delivered projects for Medtronic, Novartis, Embraer, Ford, Fleury, and Hospital Sírio-Libanês.
End-to-End Solutions
From Data Architecture to BI & Analytics - complete data solutions that drive business value.
Global Experience
Working with global teams, multilingual (PT/EN/ES), and understanding of international business.
Ready to transform your data into results?
Let's talk about how I can help your business grow with data.