Hire the Best Relational Databases Specialists
in Brazil

I'm working as a Data Engineer with over 15 years of experience as a DBA, Database/BI Developer, Data Engineer, and Data Architect, my expertise includes relational databases like SQL Server, MySQL, PostgreSQL, Netezza, and SQLDW as well as big data solutions like Hadoop, Apache Spark, and other related solutions like HBase, Apache Pig, Impala, Hive, MongoDB, Google BigQuery, Airflow, Amazon EMR, Azure Synapse Analytics, Databricks, Cloudera Data Platform and so on. I have certifications in Azure Data Engineer, Google Cloud Data Engineer, AWS Cloud Practitioner, Microsoft SQL Server, MySQL, and others. I've been working for a while with on-premises environments, but lately, I've been working more with cloud environments on Azure, AWS, and GCP. I have a great experience in Linux environments and programming languages such as Scala, Python, R, and SQL. Also, I have strong experience in ETL/ELT processes, Data Modelling, and Data Ops.

I'm a senior software engineer, with a Bachelor's degree in Computer Science and over 5 years of professional experience in full stack web development, web scraping, data pipelines. Also, I have experience with AI (LLM, MCP, LangChain, RAG) machine learning, and data science. My expertise lies primarily in backend development and systems integration, where I specialize in Python frameworks such as FastAPI, Flask, Django, Odoo, Firebase, Apache Airflow, Node.JS / TypeScript, along with frontend experience in Vue.js and React. I am also proficient in asynchronous programming and have extensive experience working with both relational and non-relational databases. Additionally, I have worked with cloud technologies like Google Cloud, AWS, and Docker. As a professional, I possess strong analytical and problem-solving skills, gained from working with third-party code, including open source software and Odoo modules. I prioritize automated testing and adhere to coding best practices, such as SOLID principles and Design Patterns, to ensure that I deliver clean, well-documented, and reusable code that facilitates seamless maintenance. Thank you for visiting my profile, and I look forward to hearing from you!

Over the past 10 years, I have developed database information systems using Microsoft SQL Server, MySQL and Access; developed websites using HTML, DHTML, CSS, PHP, ASP.NET, Jquery and Javascript. My knowledge includes: Advanced level proficiency in MSSQL, Database Analysis and Design, Create tables, Stored procedures, views, triggers and complex queries for reporting, Database Administration, Database documentation, SQL optimization, Disaster Recovery, Data Security, Backup and Recovery, ETL and SSIS packages, clear communication in verbal and written English/Spanish/Portuguese. In addition, I have experience working with Excel VBA, data manipulation/cleansing and Excel Macros. I'm focused on efficiency and automation, insightful analysis, and producing high quality work for my clients. I'm a responsable and serious worker and I like to do my best on every job I take. I like challenges and ready to face difficulties. It makes me always learn something new and be on top of the hill.

COMMUNICATION AND PAYMENTS ONLY VIA UPWORK, PLEASE DO NOT INSIST Quick Summary: Former Deloitte Senior GenAI Software Engineer with 12+ years of Python expertise. Specializes in developing AI agents using Python, LangChain, and LangGraph, deploying them across major cloud platforms (AWS, GCP, Azure). DataCamp-certified in Data Analysis, Data Science, and Data Engineering and HackerRank-certified Software Engineer. "Jonatas was quick, accurate, and the code he wrote for my project was effective and well commented! Definitely recommend." ★★★★★ "Jonatas is an excellent programmer. He delivered a well-written Pinescript strategy and indicator as promised. Keep up the good work." ★★★★★ "We hired Jonatas for a week to optimize our models, and the results were incredible: over a 50% reduction in execution time! An extremely dedicated and focused professional." ★★★★★ Tired of manual processes and hitting limitations with your current tech? I build intelligent, autonomous AI agents that automate complex workflows, provide deep data insights, and create powerful new efficiencies for your business. You're likely here because you have a powerful vision for AI but need a true expert to bring it to life, in need of a strategic partner who can architect and deploy robust, enterprise-grade AI solutions on major cloud platforms like AWS, GCP, or Azure. That's exactly what I do. As a former Senior GenAI Software Engineer for Deloitte, I specialize in translating complex business needs into high-performance AI systems. I don't just deliver code; I deliver measurable results and a tangible return on your investment. My core value to you: ✅ Enterprise-Grade GenAI Development: Leveraging my experience at Deloitte, I build sophisticated AI agents using Python, LangChain, and LangGraph for the "new agentic era" of software. ✅ Proven Data Science Excellence: I implement advanced data analysis and predictive models, achieving up to 99.70% R² accuracy on projects, ensuring your decisions are backed by reliable data. ✅ Full-System Ownership: I am not just an AI specialist. With full-stack expertise (React.Native, TypeScript, Python, Flask) and deep database knowledge (PostgreSQL), I can own your project from front-end to back-end and deployment. ✅ Certified & Cloud-Fluent: I am certified by DataCamp (Data Analyst, Data Scientist, Data Engineer), HackerRank (Software Engineer), and AWS (Cloud Practitioner), with hands-on experience deploying across AWS, GCP, and Azure. My services include: - Custom AI Agent & LLM-Powered Applications - Workflow Automation & Process Optimization - Predictive Analysis & Machine Learning Models - Automated Data Scraping & ETL Pipelines - End-to-End Cloud Solution Architecture (AWS, GCP, Azure) - High-Performance Back-End Development with Python & Flask Let's move your project from idea to implementation. Click the green "Invite to Job" button and send me a message about your project goals. I'll get back to you promptly to schedule a brief introductory call. P.S. Don't just take my word for it. Check out my portfolio at github to see how I've implemented a huge variety of projects and developed data-driven products to my clients. Let's build your success story next!

I help businesses streamline operations by connecting their tools, automating workflows, and turning fragmented data into reliable systems that support growth. My work sits at the intersection of marketing operations, automation, data systems, SEO/AEO, and full-stack development. I build practical, scalable systems that reduce manual work, improve visibility, and help teams operate faster with better data integrity. I also specialize in SEO (Search Engine Optimization) and AEO (Answer Engine Optimization), focusing on how content and structured data are interpreted by both search engines and AI-driven answer systems. This includes improving information architecture, content structure, and data flow to increase discoverability and performance across modern search environments. 🔧 Core Technical Stack Marketing Ops & Automation - HubSpot (CRM architecture, workflows, lifecycle automation) - ActiveCampaign (segmentation + automation logic) - Zapier, Make (Integromat), n8n (advanced automation systems) Data & Workflow Systems - Airtable (relational system design, scalable databases) - Google Sheets (advanced automation, data pipelines) - Notion (internal systems, lightweight CRMs, operations hubs) Analytics, SEO & AEO - Google Analytics 4 (GA4) - Google Tag Manager (GTM) - Looker Studio (automated reporting dashboards) - Google Search Console - SEO tools: Ahrefs, SEMrush - AEO optimization: structured content systems, entity-based structuring, semantic hierarchy design Full-Stack Development - JavaScript / TypeScript (automation scripts, frontend logic, API integrations) - Node.js (backend services, APIs, automation layers) - Python (data processing, automation scripts, API workflows, ETL tasks) - Ruby (legacy system support, scripting, lightweight backend work) - REST APIs, Webhooks, JSON-based integrations Databases - PostgreSQL (relational data systems, structured queries) - MySQL (database integration & management) - MongoDB (NoSQL data structures for flexible systems) - Airtable (used as a hybrid database + ops layer) ⚙️ What I Focus On - building end-to-end CRM and marketing systems that actually reflect real business logic - automating repetitive workflows across marketing, sales, and operations - integrating tools into unified systems instead of disconnected platforms - designing data structures that ensure reporting accuracy and trust - implementing SEO and AEO strategies through technical structure, not just content - building lightweight backend logic and automation systems using JavaScript, Python, and Node.js - simplifying complex systems into maintainable, scalable workflows teams can actually use I don’t over-engineer. I focus on clear logic, maintainable architecture, and systems that work in real business environments - not just technical demos.

Profile I'm a Lead Software Engineer with 15 years of experience working on a variety of projects. I'm a specialist in Web Development using React in the frontend and Java in the backend, using relational and no-sql databases. I hold a Bachelor's Degree in Computer Science and have experience working with small to big companies building complex web based solutions. For me tests are really important, and I have vast experience working with unit tests using tools such as JUnit, Jest and Cypress. I'm skilled at communicating with the diverse parties involved in the development process to efficiently solve problems. I usually help other engineers to increase their productivity by teaching or training new methods of solving problems. I'm passionate about my work and adapt quickly to new technologies, constantly looking to improve and learn. My experience allows me to get involved in the full development process from planning to deployment.