Daniel is available for hire
Hire DanielDaniel Loureiro
Verified Expert in Engineering
Software Developer
Gramado - State of Rio Grande do Sul, Brazil
Toptal member since June 20, 2017
Bio
Daniel is a seasoned senior full-stack developer with 20+ years of experience crafting web and mobile platforms across logistics, healthcare, and eCommerce. He has led innovative projects for both startups and enterprise clients, from developing an AI-driven Alexa skill for elderly care to powering high-traffic campaigns like the Fallout 76 merchandise site. Daniel is passionate about writing elegant, high-performance code that delivers real-world impact.
Portfolio
Liberate Innovations, Inc.
Python, APIs, Amazon Web Services (AWS), AI Agents, PostgreSQL, TypeScript...
CarData
PHP, Laravel, MySQL, MariaDB, React, Vue, Amazon Web Services (AWS)...
Veterans Home Care
Laravel, React, Docker, Alexa Skills Kit (ASK), AWS Lambda, Cloudflare, DevOps...
Experience
- PHP - 15 years
- React - 8 years
- React Native - 5 years
- Python - 5 years
- Docker - 4 years
- Tailwind CSS - 4 years
- Alexa Skills - 3 years
- Next.js - 3 years
Preferred Environment
GitHub, Ubuntu, Docker, Visual Studio Code (VS Code), DevContainers
The most amazing...
...thing I’ve developed is VoiceHealth, an Alexa-based AI system that supports elderly patients through daily health check-ins.
Work Experience
AI Engineer
2025 - 2026
Liberate Innovations, Inc.
- Built TypeScript AWS Lambda services with SQS queues (DLQ and retries), REST API endpoints, and Gmail inbox monitoring via Google Pub/Sub to trigger automated workflows.
- Designed and implemented inbound and outbound AI voice agents on in-house platforms, defining LiquidJS prompts, tools, and LLM, TTS, and STT configurations.
- Developed custom integrations connecting client and internal systems through REST APIs, SFTP, email automation, and third-party services such as Twilio.
- Maintained and enhanced a Python-based web form-builder platform, shipping new features and resolving security vulnerabilities.
- Implemented observability with Sentry and AWS CloudWatch, including EventBridge-scheduled canary checks that paged on-call engineers via PagerDuty when expected production logs were missing.
- Architected end-to-end AI solutions from client requirements through deployment, including multi-agent voice orchestration.
Technologies: Python, APIs, Amazon Web Services (AWS), AI Agents, PostgreSQL, TypeScript, Workflow Automation & System Integration, Artificial Intelligence (AI), API Integration, AI Voice Agents, OpenAI, Twilio, AWS Lambda, CI/CD Pipelines, Node.js, Amazon Simple Queue Service (SQS), Amazon CloudWatch, REST APIs, Sentry, AI Prompts, Prompt Engineering, Agile, Git, FastAPI
Senior Full-stack Developer
2025 - 2025
CarData
- Implemented ThoughtSpot BI integration with custom row-level security rules, data models, embedded analytics, and customized liveboards.
- Maintained and enhanced the legacy platform for vehicle reimbursement services.
- Fixed multiple issues, including security vulnerabilities, server stability problems, and reporting inconsistencies.
- Implemented centralized session storage, enabling zero-downtime deployments and eliminating customer logouts during maintenance windows.
- Collaborated with the development team using Agile methodology to deliver bug fixes and feature enhancements within 2-week sprint cycles.
Technologies: PHP, Laravel, MySQL, MariaDB, React, Vue, Amazon Web Services (AWS), Octopus Deploy, Jenkins, ThoughtSpot, Agile, Redis, Docker, NGINX, SaaS
Senior Full-stack Developer
2023 - 2024
Veterans Home Care
- Led the development of VoiceHealth, a HIPAA-compliant Alexa Skill ecosystem serving thousands of elderly patients across multiple nursing homes, featuring AI-powered natural conversations for daily wellness monitoring.
- Architected and implemented an AI agent system using Python, LangChain, and OpenAI GPT models with tool-calling capabilities for emergency response, family notifications, and empathetic patient interactions based on configurable guidelines.
- Built a sophisticated context-aware conversation system using PGVector for semantic search and memory retrieval, enabling the AI to remember patient details and provide personalized, contextual responses across conversations.
- Developed the VoiceHealth Portal in React with TypeScript, consuming both REST and GraphQL APIs from a Laravel back end, providing real-time patient monitoring dashboards for healthcare providers and families.
- Collaborated directly with Amazon architects to improve infrastructure, resolve Smart Properties limitations, and optimize scale.
- Integrated smart medical devices (scales, oximeters, blood pressure monitors) with automatic data feeding into the VoiceHealth ecosystem for comprehensive health tracking.
- Implemented end-to-end HIPAA-compliant encryption beyond HTTPS, using public/private key pairs with key repository services for all data in transit between Node.js skill endpoints, Python AI services, and React front end.
- Maintained microservices architecture with Node.js/Express (Alexa skill endpoint), Python/FastAPI (AI orchestration), Laravel (back-end APIs), and React/TypeScript (portal).
- Integrated VoiceHealth skill with Alexa Smart Properties and PBX (Asterisk) for call routing, emergency response, and landline support (via WebRTC).
- Helped showcase VoiceHealth at the AI4 2024 conference at the MGM Grand in Las Vegas as an example of AI-driven care innovation in the healthcare sector.
Technologies: Laravel, React, Docker, Alexa Skills Kit (ASK), AWS Lambda, Cloudflare, DevOps, CI/CD Pipelines, Deployment, Python, FastAPI, AI Pipeline, Conversational AI, Artificial Intelligence (AI), Full-stack, Large Language Models (LLMs), Pinecone, Machine Learning, Agentic AI, Node.js, Full-stack Development, Natural Language Processing (NLP), REST, APIs, API Integration, REST APIs, WebSockets, Back-end, Containers, Tailwind CSS, Text-to-Speech (TTS), Speech-to-Text (STT)
Senior Full-stack Developer
2017 - 2023
HungryMedia LLC
- Led development across dozens of client projects using Laravel, React, React Native, Node.js, Python, WordPress, Joomla, Angular, Next.js, TypeScript, and more.
- Built the Health Nut website (Kardashian-owned restaurant chain) using Next.js, TypeScript, Material UI, and Tailwind CSS, along with the complete internal restaurant management system.
- Developed high-traffic eCommerce platforms, including the official Fallout 76 Nuka-Cola merch store that handled massive launch traffic.
- Built multiple React Native mobile applications with TypeScript, including Music by Masses (musician-fan competition with chat, payments, profiles) and Outdoor Exchange (peer-to-peer gear rental marketplace).
- Led full-stack TypeScript development using modern toolchains: React, Next.js, Node.js, Express, with state management, testing frameworks, and build tools.
- Supported diverse web and mobile projects under tight deadlines, maintaining code quality and business alignment across multiple US-based stakeholders.
- Managed complete DevOps lifecycle, including CI/CD pipelines, Docker containerization, AWS deployments, database optimization (PostgreSQL, MySQL), and infrastructure scaling.
Technologies: Laravel, PHP, React, React Native, WordPress, Amazon Web Services (AWS), TypeScript, Stripe API, Docker, DevContainers, MySQL, PostgreSQL, Linux, Angular 5, Joomla, Tailwind CSS, CI/CD Pipelines, Deployment, Server Management, Unit Testing, WordPress Plugins, Mobile Development, Cloudflare, Alexa Skills Kit (ASK), Alexa Skills, DevOps, OVH, Python, FastAPI, OpenAI API, LangChain, Node.js, WebRTC, WebSockets, API Integration, JSON, XML, Stripe, OAuth 2, OAuth, SAML, SAML 2.0, OpenID, Large Language Models (LLMs), REST, REST APIs, Full-stack, Artificial Intelligence (AI), CSS, HTML, JavaScript, Twilio, Twilio API, APIs, Back-end, Back-end Development, Front-end, Front-end Development, Full-stack Development, Git, GitHub, Third-party APIs, Server-side Rendering (SSR), Containerization, Containers, GraphQL, eCommerce, Databases, Database Design, Object-oriented Programming (OOP), SQL, Data Integration, API Development, Elasticsearch, Test-driven Development (TDD), ERD, Azure, Redis, Infrastructure as Code (IaC), NestJS, Vue, Vue 3, Expo, AdonisJS, AI Pipeline, Recommendation Systems, Conversational AI, Pinecone, Machine Learning, Agentic AI, Sentry, Natural Language Processing (NLP), Next.js, Text-to-Speech (TTS), Speech-to-Text (STT), AI-generated Code
Ruby on Rails Developer
2015 - 2016
StageCoach Software PTY
- Built Zillow‑style portal ingesting 4+ million listings per month.
- Developed custom web scrapers to collect real estate data from numerous Australian listing sites, handling anti-scraping measures and data inconsistencies.
- Parsed complex Australian real estate addresses into a normalized format using advanced regex patterns and fallback rules.
- Designed and maintained a suite of unit tests for the address parser with hundreds of edge cases, enabling confident and stable feature improvements.
- Engineered a proxy manager that rotated IPs, detected bans, introduced delays, and enabled large-scale parallel scraping with minimal downtime.
- Supported the core data ingestion pipeline of a Zillow-style real estate platform serving thousands of daily users.
- Installed, set up, and maintained server infrastructure (e.g., MySQL, Nginx, AWS, Engine Yard, Cloudflare).
Technologies: Amazon Web Services (AWS), NGINX, MySQL, Linux, JavaScript, Ruby, Regex, RSpec, Web Scraping, Chef, Ruby on Rails (RoR), Unit Testing, Full-stack, Full-stack Development, REST, APIs, API Integration, REST APIs, Back-end
Full-stack Ruby on Rails Developer
2015 - 2015
Strategic Natural Resource Consultants
- Optimized a slow, bug-ridden Ruby on Rails and Angular app for tracking 200+ field employees and their gear across large geographic regions.
- Improved app performance and responsiveness for use in areas with limited or no internet connectivity.
- Ported legacy AngularJS front end to React to reduce technical debt and enhance maintainability.
- Integrated with internal systems for tracking check-in/check-out times, gear assignments, and real-time field activity.
- Ensured compatibility with large display monitors at command centers and lightweight mobile devices in remote field operations.
Technologies: Amazon Web Services (AWS), PostgreSQL, Ruby on Rails (RoR), React, Angular, Ruby, Apache, Capistrano, Offline-first Development, Real-time Systems, Full-stack, Full-stack Development, REST, APIs, API Integration, REST APIs, Back-end
Co-founder | Lead Developer
2013 - 2014
Float
- Co-founded a boutique software agency offering web development services for local businesses and startups.
- Led all client work: scoping, implementation, support, and deployment, including back-end and front-end development.
- Collaborated with a designer partner on branding and UI/UX, handling full integration into custom themes and platforms.
- Managed client relationships, sales, and delivery, gaining hands-on experience in B2B contracting and expectations management.
Technologies: Ruby on Rails (RoR), WordPress, Recommendation Systems, Full-stack, Machine Learning, Sentry, Full-stack Development, REST, APIs, API Integration, REST APIs, Back-end
IT Manager | Lead Software Engineer
2002 - 2013
CCGL / Termasa
- Promoted from intern to Corporate IT Manager, leading the IT of one of the world’s largest grain storage complexes.
- Designed and built a control system for truck/train/ship cargo operations from scratch, automating all workflows for grains and fertilizers. The system replaced paper-based, corruption-prone processes with a secure, auditable digital workflow.
- Designed a bank-like system to track multi-million dollar storage balances for agricultural giants like ADM, Bunge, and Cargill.
- Developed hardware integration with custom drivers for analog/digital cameras (via DLL and TWAIN), Toledo truck/train scales (via serial parsing), and dot-matrix printers.
- Led the development of a dynamic-pricing logistics system for CCGL’s dairy factory, managing 200,000+ farmer accounts and integrating modified POS terminals, a custom GSM network, and RFIDs.
- Built and deployed web portals to give customers real-time visibility into balances, withdrawals, deliveries, and quality reports.
- Developed a web-based truck scheduling platform that eliminated 20-mile harvest queues and enabled prioritized slot management for clients.
- Engineered a dynamic pricing and logistics system for CCGL’s dairy factory, tracking quality-adjusted payouts for 200,000+ farmers, connected via custom POS terminals and a private GSM network.
- Integrated the multiple internal systems (corporate ERP, operational systems, logistic systems, factory SCADA systems, direct bank access) across numerous geographical locations.
Technologies: MySQL, PostgreSQL, PHP, Delphi, SCADA, Hardware Plugins, Intranets, POS, PABX, Full-stack, Full-stack Development, APIs, API Integration, REST APIs, Back-end
Co-founder | CTO
2010 - 2012
King Compras
- Co-founded a successful Groupon-style daily deals platform in a mid-sized Brazilian city, reaching over 40,000 unique users.
- Developed the entire platform architecture, including merchant dashboards, customer accounts, payment processing, and reporting tools.
- Managed infrastructure and email delivery pipelines through AWS, handling traffic spikes during flash sales.
- Handled sales, customer support, legal disputes, and accounting, gaining a comprehensive view of startup operations.
Technologies: PHP, Amazon Web Services (AWS), Payment Gateways, Full-stack, Full-stack Development, APIs, API Integration, Back-end
Experience
VoiceHealth – AI-powered Alexa Skill for Elder Care
https://smartcompanion.care/VoiceHealth is a HIPAA-conscious health tracking solution designed for elderly care through voice interaction. I led the development of the entire platform, building both the Alexa Skill and a companion web dashboard. The system collected daily health check-ins from patients via SmartCompanion Alexa devices and displayed real-time data for families and healthcare providers.
I also integrated VoiceHealth with Alexa Smart Properties and a custom PBX for emergency call routing and landline support. AI was incorporated through OpenAI APIs for natural interaction, including dynamic patient conversation flows and voice synthesis (TTS).
The project was showcased at AI4 2024 in Las Vegas as a pioneering example of AI in elder care. I was responsible for the architecture, coding, deployment (AWS), and ongoing system maintenance.
I also integrated VoiceHealth with Alexa Smart Properties and a custom PBX for emergency call routing and landline support. AI was incorporated through OpenAI APIs for natural interaction, including dynamic patient conversation flows and voice synthesis (TTS).
The project was showcased at AI4 2024 in Las Vegas as a pioneering example of AI in elder care. I was responsible for the architecture, coding, deployment (AWS), and ongoing system maintenance.
thecodecrate-pipeline – A Python Port of League/Pipeline
https://github.com/thecodecrate/python-pipelineI created and published thecodecrate-pipeline, a modern, fully typed Python implementation of the popular League/Pipeline PHP library. The goal was to offer a clean, extensible pipeline architecture that supports both synchronous and asynchronous stages. This project includes customizable processors (chain, interruptible, command-based), typed protocols, trait-based configuration, and integration with stream inputs. It is fully documented and published on PyPI, including unit tests and examples.
Termasa Operations – Hardware-integrated Control System
At Termasa (the world's 2nd largest grain storage terminal), I architected and built from scratch a mission-critical freight logistics control system managing all truck and train loading/unloading operations for 200,000+ farmers. The platform integrated complex hardware, including analog/digital cameras (custom drivers), Toledo truck/train scales (serial communication parsing), and dot-matrix printers through a robust plugin-based architecture using a Delphi front end and a PHP back end. Key features included automated audit photography, sophisticated quality control logic, FIFO-based inventory management, real-time customer web portals, and seamless integration with corporate ERP (Totvs) and industrial SCADA systems. The system eliminated physical queues during peak harvest seasons, dramatically reduced theft, enhanced operator accountability, and transformed freight operations across three transportation modalities (trucks, trains, ships) while processing millions of tons annually with zero-downtime requirements.
Pampa System – Freight Management Platform
https://www.termasa.com.br/Pampa was developed to solve a massive congestion problem at Termasa, the world's 2nd largest grain storage facility by capacity. During harvest season, truck lines would extend up to 20 miles, causing operational chaos and driver frustration.
I designed and developed this web-based scheduling platform from scratch, allowing customers to reserve time slots for unloading operations. By digitally organizing truck arrivals, the system completely eliminated physical queues, driver protests, and operational bottlenecks.
The platform evolved to include intelligent prioritization based on cargo types and client profiles, enabling strategic operational decisions. I handled the complete full-stack development, including back-end logic, front-end interface, database design, integration with corporate ERP systems, and production deployment, ensuring rock-solid reliability during peak harvest seasons.
Sistema Pampa dramatically improved operational efficiency and remains in production use decades after its initial launch, a testament to its robust architecture and enduring value.
I designed and developed this web-based scheduling platform from scratch, allowing customers to reserve time slots for unloading operations. By digitally organizing truck arrivals, the system completely eliminated physical queues, driver protests, and operational bottlenecks.
The platform evolved to include intelligent prioritization based on cargo types and client profiles, enabling strategic operational decisions. I handled the complete full-stack development, including back-end logic, front-end interface, database design, integration with corporate ERP systems, and production deployment, ensuring rock-solid reliability during peak harvest seasons.
Sistema Pampa dramatically improved operational efficiency and remains in production use decades after its initial launch, a testament to its robust architecture and enduring value.
3d-party Health Device Integration for VoiceHealth
http://smartcompanion.care/I led the integration with a third-party vendor supplying smart health devices (scales, blood pressure monitors, glucose meters) via a proprietary hub and API. I implemented an event-sourcing architecture in Laravel, storing raw API data as immutable events and projecting normalized patient records for internal use.
This design enabled flexible adaptation to vendor API changes and internal data model evolution without impacting historical data.
This project showcases my experience with API integrations, data normalization, scalable back-end architecture, and hardware-to-cloud health monitoring systems.
This design enabled flexible adaptation to vendor API changes and internal data model evolution without impacting historical data.
This project showcases my experience with API integrations, data normalization, scalable back-end architecture, and hardware-to-cloud health monitoring systems.
Education
1998 - 2001
Graduate Coursework in Software Development
Federal Institute of Rio Grande do Sul - Rio Grande, Brazil
Skills
Libraries/APIs
React, REST APIs, Node.js, Alexa Skills, Stripe, Vue, Stripe API, WebRTC, OpenAI API, Python Asyncio, OpenID, Twilio API, API Development, Vue 3
Tools
GitHub, NGINX, RSpec, Chef, Apache, Capistrano, Amazon CloudFront CDN, Git, Expo, Sentry, Jenkins, Amazon Simple Queue Service (SQS), Amazon CloudWatch, AI Prompts
Languages
JavaScript, PHP, Python, TypeScript, CSS, HTML, Ruby, Regex, Delphi, C, COBOL, Pascal, Clipper, PyPy, XML, SAML, GraphQL, SQL
Frameworks
Laravel, React Native, Next.js, Tailwind CSS, Ruby on Rails (RoR), Angular, Redux, Angular 5, Alexa Skills Kit (ASK), OAuth 2, NestJS, AdonisJS
Paradigms
REST, DevOps, Unit Testing, Mobile Development, Offline-first Development, Real-time Systems, Database Design, Object-oriented Programming (OOP), Test-driven Development (TDD), Automation, Event Sourcing, Agile
Platforms
Ubuntu, WordPress, Linux, Docker, Twilio, Amazon Web Services (AWS), Engine Yard, Joomla, AWS Lambda, Visual Studio Code (VS Code), AWS Elastic Beanstalk, Azure, ThoughtSpot
Storage
PostgreSQL, MySQL, Databases, OVH, Amazon S3 (AWS S3), JSON, Data Integration, Elasticsearch, Redis, MariaDB
Other
API Integration, Full-stack, Artificial Intelligence (AI), APIs, Back-end, Full-stack Development, WebSockets, FastAPI, LangChain, Large Language Models (LLMs), Containers, AI Pipeline, Recommendation Systems, Conversational AI, Machine Learning, Agentic AI, Natural Language Processing (NLP), Text-to-Speech (TTS), Speech-to-Text (STT), AI-generated Code, Web Scraping, SCADA, Hardware Plugins, DevContainers, CI/CD Pipelines, Deployment, Server Management, OpenAI, WordPress Plugins, Cloudflare, Web Development, Algorithms, Intranets, POS, PABX, Payment Gateways, Amazon RDS, Pipelines, Libraries, OAuth, SAML 2.0, Back-end Development, Front-end, Front-end Development, Third-party APIs, Server-side Rendering (SSR), Containerization, eCommerce, ERD, Infrastructure as Code (IaC), Hardware Integration, Enterprise Resource Planning (ERP), Serial Communication, Workflow Automation & System Integration, Logistics, Smart Devices, Device Integration, Pinecone, Octopus Deploy, SaaS, AI Agents, AI Voice Agents, Prompt Engineering
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