Arnaldo is available for hire
Hire ArnaldoArnaldo Silva Rodrigues Junior
Verified Expert in Engineering
Full-stack AI Developer
Curitiba - State of Paraná, Brazil
Toptal member since April 3, 2015
Bio
Arnaldo is a software architect and engineering leader who co-founded and scaled a consultancy to 50+ engineers, serving as CTO and CFO for over a decade. The work he's done across fintech, pharma, telecom, and IoT shaped how he thinks about architecture: systems that evolve, not just ship. Arnaldo's career spans embedded firmware, full-stack development, cloud platforms, and now AI-powered systems with LLM integration.
Portfolio
Toptal Clients
Angular, React, Ionic, Node.js, Google Cloud Platform (GCP)...
Tekna
Software Architecture, TypeScript, GraphQL, CTO, Architecture, MySQL, MongoDB...
BRQ
Software Architecture, Architecture, Java, Behavior-driven Development (BDD)...
Experience
- System Integration - 20 years
- Full-stack Development - 18 years
- Solution Architecture - 15 years
- Technical Leadership - 15 years
- Fintech - 10 years
- Fractional CTO - 10 years
- Cloud Architecture - 6 years
- LLM Integration - 4 years
Preferred Environment
React, Node.js, Python, TypeScript, Go, PostgreSQL, AWS IoT, LangGraph, OpenAI API
The most amazing...
...thing I did was start an outsourcing company, scale it to a 50+ engineer organization, and deliver enterprise solutions that companies relied on every day.
Work Experience
Software Architect | Full-stack Developer
2015 - PRESENT
Toptal Clients
- Architected AI/LLM integration solutions leveraging Claude and OpenAI APIs with prompt engineering for enterprise applications.
- Implemented 2FA security using FIDO keys and Google Authenticator for cryptocurrency exchange handling sensitive financial transactions.
- Worked on a manufacturing optimization system for pharmaceutical COVID-19 vaccine production using React, Next.js, Python, GraphQL, and D3.js visualization.
- Modernized legacy platforms to React/Next.js cloud-native architectures on AWS and GCP for enterprise telecommunications.
- Developed a WebRTC real-time communications system with FreeSWITCH integration for browser-based VoIP and SIP handling.
- Created an IoT telemetry pipeline with ESP32, OBD-II, and GPS integration for real-time vehicle data streaming and analysis.
- Created Jira-to-Xero integration automating time tracking and invoice synchronization, reducing manual reconciliation overhead.
- Led Angular-to-React migration using micro front-end architecture for an event ticketing platform, modernizing legacy front-end infrastructure.
- Designed a scalable cryptocurrency data platform handling thousands of digital assets with Node.js and a distributed database architecture.
Technologies: Angular, React, Ionic, Node.js, Google Cloud Platform (GCP), Amazon Web Services (AWS), Docker, Kubernetes, PostgreSQL, MySQL, Firebase, MongoDB, Express.js, Microservices, Mobile, Software Development Lifecycle (SDLC), Solution Architecture, JSON, ETL, CSS, CSS3, iOS, Mobile Applications, Technical Leadership, Django, Full-stack Development, AWS Cloud Architecture, React Native, User Experience (UX), User Interface (UI), NoSQL, REST APIs, Data Engineering, CI/CD Pipelines, API Integration, Accessibility, Fractional CTO, Kotlin, Swift, Minimum Viable Product (MVP), Concurrency, Scalable Web Services, Large Language Models (LLMs), GraphQL, Puppeteer, Redis Cache, Webpack, Capacitor, Redux, Go, Microsoft Excel, Excel 365, Excel VBA, Tailwind CSS, Figma, React Redux, Flutter, Python, FastAPI, Flask, SQLAlchemy, Socket.IO, Bootstrap 4, Team Management, Fintech, Amazon EC2, Technical Architecture, Cloudflare, Test-driven Development (TDD), Back-end Development, API Development, ERD, Elasticsearch, Vercel, Data Pipelines, Deployment, B2B, Software Design, Cloud Infrastructure, Integration, Mobile App Development, Amazon Aurora, BigQuery, Cordova Plugins, Google BigQuery, Mobile Development, Front-end, Anthropic, HIPAA Compliance, Prompt Engineering, SendGrid, Twilio, NestJS, OpenAI, Claude, Agentic AI, n8n, LangChain, Twilio API, SMS, Customer Relationship Management (CRM), Notion, Asana, LangGraph, Stripe, Machine Learning, AI Solutions Architecture, AI Architecture, Cross-platform, MQTT, TCP/IP, Session Initiation Protocol (SIP), Firmware over the Air (FOTA), Azure, System Integration, Web Performance Optimization (WPO), Nx, RxJS, WCAG 2, Web Content Accessibility Guidelines (WCAG), Webhooks, ChatGPT, AWS Database Management System, Automation, SMTP, Product Delivery, Software System Architecture Development, Generative Artificial Intelligence (GenAI), Vite, AI Agents, AI Programming, Agentic Frameworks, System Design, Database Development, Large Language Model (LLM) Optimization, Retrieval-augmented Generation (RAG), Firebase Cloud Functions, Backups, Communication, Scalability, Security, Startups, Testing, Product Discovery, SaaS, AI Architect & Full-stack, AWS IoT, Claude Agent SDK, Claude Code, Cursor AI, LLM Integration, AI Integration, Model Context Protocol (MCP), MCP server, SOAP APIs, OAuth 2, Google Cloud, Back-end Architecture, Distributed Systems, Terraform, TypeORM, OpenAPI, SDKs, Sockets, UI Design, Web Development, Responsive Web Design (RWD), Code Review, Multi-agent Systems, Agentic RAG Systems, Enterprise Security, AI Agent Orchestration, AI Product Strategy, Agentic Coding, Systems Design, Unit Testing, Amazon API Gateway, Amazon EventBridge, Amazon Simple Queue Service (SQS), AWS Copilot, HIPAA
Chief R&D Officer | Partner
2012 - PRESENT
Tekna
- Created an R&D division to develop innovative products that are the next step for the company.
- Acted as the CFO of the company from 2018 to 2020. Created a series of KPIs and controls to ensure the financial health and profitability of the company.
- Acted as the lead software architect of the company, team lead, and full-stack developer from 2012 to 2018, working on many projects, mainly using JavaScript with Angular, Node.js, MySQL, PostgreSQL, and Firebase.
- Architected and led a team that built a cash-back system using the concept of double-entry bookkeeping. The web version was built with Angular, and the apps with Ionic. The back end was Node.js on AWS, using Lambda functions and Kubernetes.
- Created new features in Volvo Finance, an iOS application to simulate the monthly payment calculation of the financing of vehicles for the Volvo Group.
- Architected and developed VPSA ERP’s mobile for Android tablets.
- Built billing and charging systems for VoIP providers.
- Started and structured a software-outsourcing business in Brazil from scratch, alongside my business partner, from long-term strategic planning to hiring an office cleaner.
- Built a multi-agent AI trading platform using LangGraph, LangChain, OpenAI, and Claude APIs for market analysis and automated trade execution.
Technologies: Software Architecture, TypeScript, GraphQL, CTO, Architecture, MySQL, MongoDB, Express.js, Node.js, CSS, HTML, Android, Java, JavaScript, Behavior-driven Development (BDD), Agile Software Development, Neo4j, Git, APIs, MEAN Stack, Swagger, JSON Web Tokens (JWT), Agile, DevOps, Microservices, Cloud Architecture, Project Management, Angular, PostgreSQL, Full-stack, Mobile, AWS Lambda, Amazon DynamoDB, Software Development Lifecycle (SDLC), Solution Architecture, JSON, ETL, CSS3, iOS, Mobile Applications, Technical Leadership, Full-stack Development, Amazon Cognito, Mobile Apps, User Experience (UX), User Interface (UI), NoSQL, Performance, Leadership, Artificial Intelligence (AI), REST APIs, Data Engineering, Fractional CTO, Kotlin, Swift, Minimum Viable Product (MVP), Concurrency, Scalable Web Services, Large Language Models (LLMs), Cordova, FreeSWITCH, IP Telephony, Telephony, PBX, Web Scraping, Supabase, Zapier, Go, Microsoft Excel, Excel 365, Excel VBA, Figma, Flutter, Python, FastAPI, Flask, SQLAlchemy, Socket.IO, Bootstrap 4, Team Management, Fintech, Amazon EC2, Technical Architecture, Test-driven Development (TDD), Back-end Development, API Development, ERD, Elasticsearch, Data Pipelines, Deployment, B2B, Software Design, Cloud Infrastructure, Integration, Mobile App Development, PHP, Healthcare, Front-end, Anthropic, Prompt Engineering, SendGrid, NestJS, OpenAI, Claude, Agentic AI, n8n, LangChain, Twilio API, SMS, Customer Relationship Management (CRM), Notion, Asana, LangGraph, Stripe, AWS IoT, Data Science, Machine Learning, AI Solutions Architecture, AI Architecture, Cross-platform, Embedded C, STM32, Embedded C++, Firmware Development, GPS, On-board Diagnostics II (OBD-II), ESP32, Real-time Operating System (RTOS), Microcontrollers, MQTT, Logic Analyzers, FreeRTOS, CAN Bus, Session Initiation Protocol (SIP), Printed Circuit Board (PCB), Firmware over the Air (FOTA), System Integration, Automated Trading Software, Trading Bots, Trading, Web Performance Optimization (WPO), Nx, RxJS, WCAG 2, Web Content Accessibility Guidelines (WCAG), Webhooks, ChatGPT, Automation, SMTP, Board Reporting, Product Delivery, Software System Architecture Development, Generative Artificial Intelligence (GenAI), Vite, AI Agents, AI Programming, Agentic Frameworks, System Design, Database Development, Large Language Model (LLM) Optimization, Retrieval-augmented Generation (RAG), Firebase Cloud Functions, Backups, Communication, Scalability, Startups, Testing, Product Discovery, SaaS, AI Architect & Full-stack, Claude Agent SDK, Claude Code, Cursor AI, LLM Integration, AI Integration, Model Context Protocol (MCP), MCP server, SOAP APIs, FastMCP, OAuth 2, Google Cloud, Back-end Architecture, Distributed Systems, Terraform, TypeORM, PostGIS, OpenAPI, SDKs, Internet of Things (IoT), Sockets, Telemetry, UI Design, Web Development, Responsive Web Design (RWD), Code Review, Multi-agent Systems, Agentic RAG Systems, Enterprise Security, AI Agent Orchestration, AI Product Strategy, Agentic Coding, Systems Design, Unit Testing, Deno
Software Developer Consultant
2010 - 2013
BRQ
- Allocated as a third-party resource in GBM-HSBC Bank.
- Led the development of the system that communicated with the Brazilian regulatory agency (ANBIMA) about investment funds and managed portfolios and the development of the system that controls the tax payment for those funds.
- Developed the integration to report transactions between the Brazilian and Cayman Island branches to the Brazilian regulatory agency.
Technologies: Software Architecture, Architecture, Java, Behavior-driven Development (BDD), Agile Software Development, Project Management, Full-stack, JSON, ETL, CSS, CSS3, Technical Leadership, Full-stack Development, REST APIs, Data Engineering, Minimum Viable Product (MVP), Concurrency, Scalable Web Services, Microsoft Excel, Excel VBA, Python, Team Management, Fintech, Technical Architecture, Back-end Development, API Development, Deployment, Front-end, System Integration, Webhooks, SMTP, Product Delivery, Database Development, Communication, Scalability, Testing, SOAP APIs, Back-end Architecture, Distributed Systems, Sockets, Code Review, Enterprise Security, Systems Design, Unit Testing
Systems Analyst
2005 - 2010
Global Village Telecom
- Generated network KPI reports using Excel (VBA). Developed a system to monitor the dial-up internet equipment using Perl and SNMP. Generated call center KPI reports.
- Created tools in Excel (VBA) to support CRM and marketing strategy analysis and automated tools to monitor internet dial-up traffic.
- Analyzed data to build BI systems for a VoIP provider and a dial-up internet provider using PL and SQL in an Oracle database.
- Planned CRM processes and marketing strategy analyses based on the information acquired from BI.
- Developed a CRM system using Java and Adobe Flex. Created the Click2Call system. Created a real-time online Flash component compiler.
- Implemented improvements in the billing system of a VoIP provider.
- Led the development of improvements in the service provisioning system and the development of a small service bus.
Technologies: Software Architecture, Architecture, Visual Basic for Applications (VBA), Java, Behavior-driven Development (BDD), Project Management, Full-stack, JSON, ETL, CSS, CSS3, Technical Leadership, Full-stack Development, REST APIs, Minimum Viable Product (MVP), Concurrency, Scalable Web Services, IP Telephony, Telephony, PBX, Microsoft Excel, Excel VBA, Technical Architecture, Back-end Development, API Development, Deployment, Front-end, Session Initiation Protocol (SIP), System Integration, SMTP, Database Development, Communication, Scalability, Testing, SOAP APIs, Back-end Architecture, Distributed Systems, Sockets, Code Review, Unit Testing
Intern
2004 - 2005
Infomatrix Consultoria, Informática e Informação LTDA
- Fixed bugs in a document management system for agro-industries.
- Developed new features for the document management system using VB6.
- Wrote SQL procedures to process information for reports in an Oracle database.
Technologies: SQL, Full-stack Development, Minimum Viable Product (MVP), Database Development
Intern
2003 - 2004
LAX Eletrônica e Telecomunicações LTDA
- Programmed micro-controllers in assembly language.
- Wrote a library to create a FAT file system over an EEPROM.
- Implemented serial communication using I2C to control peripherals.
- Designed circuit boards and welded electronic boards.
Technologies: Microchip PIC18, PIC16, Linux, Assembly, Minimum Viable Product (MVP), Firmware
Experience
Multi-agent AI Trading Platform
https://veylor.scienceDesigned and built a multi-agent system for market analysis and automated trade execution using Python and FastAPI for the back end, with LangGraph orchestrating specialized AI agents. Each agent handles specific functions: market data analysis, opportunity identification, risk assessment, and execution management. Integrated OpenAI and Claude APIs for natural language reasoning and decision support, with PostgreSQL for data persistence and historical analysis.
Automotive Telemetry and Dashboard Pipeline (ESP32 and OBD-II, GPS, IMU)
Built an embedded telemetry pipeline that acquires real-time vehicle data and streams it to a dashboard for analysis. On an ESP32, I integrated three subsystems: (1) OBD-II via an ELM327 adapter for engine RPM, vehicle speed, and coolant temperature; (2) GPS using TinyGPS++ for latitude/longitude and UTC time; and (3) a 6-axis IMU (Adafruit MPU6050) for 3-axis acceleration and temperature. I designed a lightweight finite-state machine to interleave reads from each subsystem without blocking, added UART and SoftwareSerial coordination, and implemented error handling/retries around ELM327 responses. The IMU is configured for ±8g and a 21 Hz digital filter to balance responsiveness and noise. The output is a structured serial stream suitable for logging or forwarding to a desktop/cloud dashboard, enabling time-aligned plots of RPM, speed, g-forces, and GPS tracks. The result is a reliable base for driver behavior insights, motorsport analysis, and fleet telematics.
WebRTC and FreeSWITCH Browser-based VoIP Tool
Reviewed and simplified an existing Node.js WebRTC signaling layer for a browser-based softphone. Ensured reliable SIP registration and media stream handling between browser clients and FreeSWITCH server. Debugged and optimized STUN/TURN server configuration, ICE candidate gathering, and SRTP media encryption. Eliminated redundant back-end logic and supported FreeSWITCH configuration for SIP profiles and NAT traversal. Delivered a stable MVP-ready system with documentation for ongoing maintenance.
Technical Lead for Innovative Fitness Application
Led a discovery phase for an MVP fitness application, defining product requirements, technical scope, and product vision. Conducted daily planning meetings to gather requirements and developed a comprehensive feature backlog, wireframes, technical documentation, and materials supporting fundraising efforts. Evaluated architecture options, development tools, and technology stack for quality, sustainability, and scalability. Delivered solution architecture documentation and supported backlog development with user-story estimation.
Advanced Excel Solutions for Retail Apparel Company
Provided advanced Excel solutions for a major American multi-brand specialty retailer, creating dashboards and automations to streamline reporting and inventory analysis. Assisted the merchandising team in generating actionable insights from large datasets, improving decision-making around product assortment, inventory levels, and sales trend analysis.
Go Back-end Maintenance for Ticketing Platform
Formalized migration strategy to transition an existing Angular application to React using micro frontends architecture for an event management platform powering ticketing, registration, and fundraising products. Created clean, maintainable architecture for the growing front-end application, establishing shared dependency management and CI/CD best practices. Performed Go back-end maintenance on the ticketing system infrastructure serving conferences, fairs, festivals, zoos, and museums.
Back-end Services for Proprietary Trading Platform
Developed and maintained back-end services for a proprietary trading platform using TypeScript and Node.js. Implemented secure API endpoints, optimized data pipelines for market data processing, and improved system reliability for real-time trading operations. Collaborated with traders to translate business requirements into robust, low-latency back-end functionality.
TypeScript/Next.js Development for Personal Finance Management Portal
Maintained and enhanced a personal financial management portal built with TypeScript and Next.js. Implemented new features for financial data visualization, user dashboard customization, and account management workflows. Optimized front-end performance through code splitting, lazy loading, and efficient state management patterns. Integrated with various financial APIs to display real-time account information and transaction history. Developed responsive UI components, ensuring cross-browser compatibility and mobile-first design principles. Collaborated with the product team to refine user experience and implement accessibility improvements across the platform.
Biotech Dashboard
Developed and maintained a comprehensive reporting and business intelligence dashboard for a biotech company. Built custom data pipelines to aggregate and transform research data from multiple sources for analysis and visualization. Created interactive dashboards using modern visualization libraries to present complex scientific data in accessible formats. Implemented automated reporting systems that generated periodic reports for research teams and stakeholders. Optimized database queries and data processing workflows to handle large datasets efficiently. Collaborated with research scientists to understand reporting requirements and translate them into technical specifications for dashboard features.
MLM eCommerce Platform
Developed and maintained a multi-level marketing eCommerce platform for a food marketing company. Built features for consultant management, order processing, and commission tracking using Angular on the front end and Node.js/Express on the back end. Implemented Salesforce integration for CRM functionality and customer relationship management. Created MongoDB data models to handle complex product catalogs, inventory management, and multi-tier pricing structures. Developed responsive user interfaces for both consultants and end customers with optimized mobile experiences. Integrated with various payment gateways and shipping providers to support nationwide order fulfillment operations.
Production System Tier-3 Support and Full-stack Development
Provided Tier-3 production support and full-stack development for a media and internet company. Diagnosed and resolved complex production issues across the entire technology stack, from database performance problems to front-end rendering issues. Implemented monitoring and alerting systems to proactively identify potential issues before they impacted users. Developed new features and enhancements using Angular and React on the front end with Firebase and AWS services on the back end. Created automated deployment pipelines and improved system reliability through infrastructure as code practices. Collaborated with operations teams to establish incident response procedures and post-mortem analysis processes.
Pharmaceutical Manufacturing Insights
Developed full-stack applications for a major pharmaceutical company's operations insights platform. Built interactive data visualization dashboards using React and D3.js to display manufacturing metrics, quality control data, and operational KPIs. Implemented GraphQL APIs with Spring Boot for efficient data retrieval from Neo4j graph databases storing complex supply chain relationships. Created real-time monitoring interfaces for production line status and batch tracking. Developed data integration pipelines to aggregate information from multiple manufacturing facilities worldwide. Collaborated with pharmaceutical scientists and operations managers to translate business requirements into technical solutions that improved manufacturing efficiency.
Cryptocurrency Exchange Platform
Developed back-end services for a cryptocurrency exchange platform using Node.js and Express.js. Implemented high-performance trading engine components capable of handling thousands of transactions per second. Built an event-driven microservices architecture using Apache Kafka for reliable message processing and order matching. Created secure API endpoints for wallet management, order placement, and transaction history. Developed PostgreSQL database schemas optimized for financial transaction storage and audit logging. Implemented comprehensive security measures, including rate limiting, input validation, and encryption protocols, to protect user assets and data.
Accessibility Testing API
Developed and improved API microservices for an accessibility testing platform using JavaScript and Node.js. Built RESTful endpoints that automated web accessibility audits against WCAG guidelines for enterprise clients. Implemented comprehensive unit testing and integration testing suites to ensure API reliability and regression prevention. Created efficient data processing pipelines to analyze HTML documents and identify accessibility violations. Developed React-based administrative interfaces for managing test configurations and viewing audit results. Collaborated with accessibility experts to refine detection algorithms and improve the accuracy of accessibility issue identification.
SMS Message Routing Engine
Developed back-end services for an SMS message routing platform using Node.js. Built high-throughput message processing systems capable of routing millions of SMS messages per day across multiple carrier networks. Implemented intelligent routing algorithms to optimize delivery rates and reduce latency based on carrier performance metrics. Created RESTful APIs for message submission, delivery status tracking, and reporting dashboards. Deployed scalable infrastructure on AWS using auto-scaling groups and load balancers to handle traffic spikes. Integrated with multiple SMS gateway providers and implemented failover mechanisms to ensure message delivery reliability.
Textbook Buyback Inventory System
Developed a textbook buyback inventory management system using Node.js, Sails.js framework, and AngularJS front end. Built automated pricing engines that integrated with the Amazon API to fetch real-time book prices and determine buyback offers. Created inventory tracking features with barcode scanning integration for rapid book processing. Implemented MySQL database schemas for managing book catalogs, transactions, and customer records. Developed administrative dashboards for managing inventory levels, processing orders, and generating financial reports. Integrated with Amazon S3 for document storage and built RESTful APIs for mobile application connectivity.
Cryptocurrency Data Platform
Developed back-end systems for a cryptocurrency data aggregation platform using Node.js, MySQL, and PostgreSQL. Built high-performance data collection services that gathered real-time cryptocurrency market data from multiple exchanges. Implemented database schemas optimized for time-series data storage and rapid querying of historical price information. Created RESTful APIs for delivering market data feeds to front-end applications and third-party integrations. Developed data transformation pipelines to normalize exchange-specific data formats into standardized structures. Built administrative tools for monitoring data collection, health, and managing exchange integrations.
Telecom Enterprise Platform Modernization
Led platform modernization efforts for a telecommunications engineering company's enterprise systems using Node.js. Redesigned legacy back-end services into a modern microservices architecture for improved scalability and maintainability. Implemented API gateway patterns and service mesh for secure inter-service communication. Developed automated provisioning systems for telecom network services and customer account management. Built integration layers connecting disparate legacy systems with modern cloud infrastructure. Created monitoring dashboards and logging infrastructure to provide visibility into system health and performance metrics.
Educational Technology Platform
Developed front-end features for Plickers, an innovative educational technology platform that transforms classroom engagement through a unique card-based response system. Using AngularJS, I built responsive and intuitive interfaces that enable teachers to instantly gather student responses and display real-time results. My work focused on creating smooth user experiences for both the teacher dashboard and student interaction components, implementing Sass for maintainable styling architecture, and ensuring high code quality standards through comprehensive testing and code reviews.
IoT Geospatial Mapping Application Architecture
Architected a sophisticated geospatial mapping application for Kizoto, designed to handle real-time IoT device tracking and visualization. The solution leveraged Google Cloud Platform services, including Google Kubernetes Engine for container orchestration, Cloud Spanner for globally distributed data storage, and BigQuery for analytical workloads. I designed the system to process and visualize location data from thousands of IoT devices in real-time, implementing efficient data pipelines and ensuring high availability across multiple regions using both GCP and AWS for redundancy.
Music Platform Back-end Development
Developed the back-end infrastructure for WhatsMusic, a music streaming and discovery platform. Using Node.js and MongoDB, I built scalable APIs for music catalog management, user playlists, and streaming endpoints. The system was designed to handle high-volume concurrent requests while maintaining fast response times for music metadata queries. I implemented efficient data modeling patterns in MongoDB to support complex music library features, including genre classification, artist relationships, and personalized recommendations based on listening history.
Accounting Workflow Automation with Xero Integration
Developed a comprehensive accounting workflow automation solution integrating with the Xero accounting platform for MERU. Using JavaScript and REST APIs, I built middleware that synchronized financial data between internal systems and Xero, automating invoice generation, expense tracking, and financial reporting. The solution streamlined accounting processes for HR and staffing operations, reducing manual data entry and ensuring real-time accuracy of financial records across multiple business units. I implemented robust error handling and data validation to maintain integrity during bidirectional synchronization.
Healthcare Excel Reporting and Analytics Solution
Developed comprehensive Excel-based reporting and analytics solutions for EyeCare Prime, a healthcare company specializing in optometry services. Using advanced Excel features and VBA automation, I created dynamic dashboards for patient analytics, appointment scheduling metrics, and revenue tracking. The reporting system enabled clinic managers to monitor key performance indicators across multiple locations, generate compliance reports, and analyze patient demographics. I implemented automated data validation and report generation workflows that significantly reduced manual effort while improving data accuracy for healthcare decision-making.
Financial API Integration Platform for Advertising Agency
Built a comprehensive API integration solution for Koh Advertising that connected their Salesforce CRM with the Xero accounting platform. The integration automated the flow of client billing data, campaign costs, and revenue tracking between systems, eliminating manual data entry and reconciliation. I developed robust middleware that handled data transformation, error handling, and synchronization scheduling. The solution enabled real-time financial visibility across sales and accounting teams, improving invoicing accuracy and significantly reducing billing cycle time for the advertising agency.
Jira-Xero Time Tracking Integration Platform
Developed a comprehensive integration platform connecting Jira project management with Xero accounting for Truenorthern Solutions Group. Built on the Google Cloud Platform, the solution automates time-tracking synchronization between development teams and billing systems. Using Node.js and REST APIs, I created middleware that transformed Jira work logs into billable entries in Xero, enabling accurate client invoicing based on actual project time. The system included Slack notifications for team updates, authentication flows for secure data access, and comprehensive reporting dashboards for project managers.
Airport Mobile Application Development
Completed development of a cross-platform mobile application for DRUO SAS using Ionic Framework and TypeScript. The app provided airport services and travel assistance features for passengers, with native iOS and Android support. I implemented Firebase integration for real-time data synchronization, push notifications, and user authentication. Following agile workflow practices, I collaborated with the existing team to finish outstanding features, fix bugs, and optimize performance. The application delivered a seamless user experience for travelers navigating airport services and information.
VPink Sales Management PWA
Developed a Progressive Web Application (PWA) for VPink, a cosmetics and beauty products company in Brazil. The application enables sales representatives to manage customer relationships, track orders, and process sales while working offline in areas with limited connectivity. Built with modern web technologies, the PWA features automatic data synchronization when connectivity is restored, push notifications for order updates, and an intuitive mobile-first interface. The system integrates with inventory management and provides real-time sales analytics dashboards for team performance monitoring.
VoIP Billing and Routing System
Architected and developed a comprehensive VoIP billing and call routing system for telecommunications providers. The platform handles real-time call data records (CDR) processing, dynamic routing based on cost optimization algorithms, and automated billing calculations for wholesale and retail customers. Built with a scalable microservices architecture, the system processes millions of call records daily while maintaining accurate billing records. Key features include least-cost routing (LCR), fraud detection mechanisms, carrier interconnection management, and detailed reporting dashboards for revenue analytics and traffic monitoring.
Vehicle Financing Simulation Platform
Developed a comprehensive vehicle financing simulation platform for automotive dealerships and financial institutions in Brazil. The system enables customers and sales representatives to calculate loan options with various parameters, including interest rates, down payments, payment terms, and balloon payments. I built a real-time credit assessment integration that compares multiple financing institutions to find the best rates for customers. The platform includes document generation for loan contracts, integration with vehicle inventory systems, and analytics dashboards tracking financing approval rates and dealer performance metrics.
Education
2021 - 2022
Executive Program in Finance
Wharton Executive Education - Online
2001 - 2012
Bachelor's Degree in Electrical Engineering - Electronics and Telecommunications
Technological University of Paraná Federal - Curitiba, Brazil
Certifications
NOVEMBER 2020 - PRESENT
Associate Traditional Web Developer
OutSystems Training Team
Skills
Libraries/APIs
Node.js, React, REST APIs, API Development, OpenAPI, SQLAlchemy, Socket.IO, Twilio API, Stripe, RxJS, SOAP APIs, Sockets, Puppeteer, React Redux, WebRTC, Vue, D3.js, Amazon API, Salesforce API, Jira REST API, OpenAI API
Tools
Git, Webpack, Microsoft Excel, Claude, n8n, ChatGPT, FreeSWITCH, Amazon Cognito, Capacitor, MATLAB, Figma, SendGrid, Notion, MQTT, Nx, Claude Agent SDK, Claude Code, Terraform, Amazon Simple Queue Service (SQS), AWS Copilot, Jira, Slack, Zapier, BigQuery, Cordova Plugins, Asana, Rollup, Xero, GitHub, Google Kubernetes Engine (GKE)
Languages
SQL, TypeScript, GraphQL, JavaScript, CSS3, CSS, HTML, Python, Excel VBA, Embedded C, UML, Go, Embedded C++, Visual Basic for Applications (VBA), Java, C++, x64 Assembly, Assembly, C#, Kotlin, Swift, VHDL, PHP, Sass
Frameworks
Angular, Ionic, Express.js, React Native, Tailwind CSS, Agentic Frameworks, JSON Web Tokens (JWT), Swagger, Next.js, Django, Redux, Flutter, Flask, NestJS, OAuth 2, Sails.js, LangGraph, Spring Boot, AngularJS, FastMCP
Paradigms
MEAN Stack, Microservices, Agile, Object-oriented Programming (OOP), Behavior-driven Development (BDD), Agile Software Development, Test-driven Development (TDD), ETL, B2B, Mobile Development, Database Development, Cross-platform, Unit Testing, Testing, Back-end Architecture, DevOps, Web Performance Optimization (WPO), Automation, Real-time Systems, Model Context Protocol (MCP), UI Design, Responsive Web Design (RWD), HIPAA Compliance, REST, Agile Workflow
Platforms
Amazon Web Services (AWS), iOS, Firebase, Mobile, Docker, Kubernetes, Android, AWS Lambda, Amazon EC2, Twilio, STM32, Google Cloud Platform (GCP), Apache Kafka, Azure, Blockchain, Vercel, AWS IoT, Salesforce, Google Cloud Engine
Storage
JSON, PostgreSQL, NoSQL, MongoDB, MySQL, Redis Cache, Data Pipelines, Amazon Aurora, Google Cloud, Neo4j, Amazon S3 (AWS S3), Amazon DynamoDB, Elasticsearch, Google Cloud Datastore, Google Cloud Spanner, PostGIS
Industry Expertise
Project Management, Enterprise Security, Healthcare
Other
CTO, APIs, Cloud Architecture, Full-stack, API Integration, Software Architecture, Architecture, Solution Architecture, Software Development Lifecycle (SDLC), Fintech, Artificial Intelligence (AI), Mobile Applications, Technical Leadership, Full-stack Development, User Experience (UX), User Interface (UI), Leadership, Fractional CTO, Minimum Viable Product (MVP), Concurrency, Scalable Web Services, Large Language Models (LLMs), Excel 365, Team Management, Technical Architecture, Back-end Development, Deployment, Software Design, Integration, Mobile App Development, Front-end, Prompt Engineering, OpenAI, Agentic AI, AI/ML Data Engineering, Autonomous AI, Large Language Model (LLM) Optimization, AI Solutions Architecture, Microcontrollers, Webhooks, TCP/IP, Session Initiation Protocol (SIP), System Integration, SMTP, Product Delivery, Software System Architecture Development, AI Agents, AI Programming, System Design, AI Architecture, Firebase Cloud Functions, Backups, Scalability, Product Discovery, SaaS, AI Architect & Full-stack, LLM Integration, Distributed Systems, SDKs, Code Review, AI Agent Orchestration, Agentic Coding, Systems Design, OutSystems, Authentication, AWS Cloud Architecture, Mobile Apps, Performance, Data Engineering, Serial Communication, CI/CD Pipelines, Accessibility, Cordova, IP Telephony, Telephony, PBX, Web Scraping, FPGA, Embedded Systems, Supabase, FastAPI, Bootstrap 4, ERD, Electrical Engineering, Firmware, Hardware, Reverse Engineering, Cloud Infrastructure, Anthropic, LangChain, SMS, Customer Relationship Management (CRM), Firmware Development, GPS, On-board Diagnostics II (OBD-II), ESP32, Real-time Operating System (RTOS), Logic Analyzers, FreeRTOS, CAN Bus, Printed Circuit Board (PCB), Bluetooth Low Energy (BLE), RTP, Firmware over the Air (FOTA), WCAG 2, Web Content Accessibility Guidelines (WCAG), AWS Database Management System, Board Reporting, Generative Artificial Intelligence (GenAI), Vite, Retrieval-augmented Generation (RAG), Communication, Security, Startups, Cursor AI, AI Integration, WebSockets, MCP server, TypeORM, Robotics, Web Development, Multi-agent Systems, Agentic RAG Systems, AI Product Strategy, Amazon API Gateway, Amazon EventBridge, HIPAA, Progressive Web Applications (PWAs), Digital Transformation, Digital Payments, Marketplace Lending, Consumer Banking, Insurance Technology (Insurtech), Technology, Cryptocurrency, Regulations, Real Estate, Cloudflare, Google BigQuery, Data Science, Machine Learning, Universal Asynchronous Receiver/Transmitter (UART), Automated Trading Software, Trading Bots, Trading, Google Agent Development Kit, Excel Dashboards, GitOps, ParcelJS, Back-end, High Code Quality, Reporting, Detail-oriented, VoIP, Finance, Internet of Things (IoT), Telemetry, Deno
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Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
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