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
Veterans Home Care
Laravel, React, Docker, Alexa Skills Kit (ASK), AWS Lambda, Cloudflare, DevOps...
HungryMedia LLC
Laravel, PHP, React, React Native, WordPress, Amazon Web Services (AWS)...
StageCoach Software PTY
Amazon Web Services (AWS), NGINX, MySQL, Linux, JavaScript, Ruby, Regex, RSpec...
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
Availability
Full-time
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
Senior Full-Stack Developer
2023 - 2024
Veterans Home Care
- Led the development of VoiceHealth, a HIPAA-compliant Alexa Skill used in elder care for daily wellness check-ins and family updates. The skill included AI-powered conversations using OpenAI models for natural interaction.
- Integrated the skill with Alexa Smart Properties and a custom PBX to enable call routing, emergency response, and landline support.
- Built and deployed the VoiceHealth Portal, a Laravel + React dashboard for healthcare providers and family members to monitor patient activity.
- Maintained the VetAssist Companion ecosystem, ensuring data security and system resilience across thousands of connected devices.
- Collaborated directly with Amazon architects to improve infrastructure, resolve Smart Properties limitations, and optimize scale.
- Helped showcase VoiceHealth at the AI4 2024 conference at 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
Senior Full-stack Developer
2017 - 2023
HungryMedia LLC
- Led development across multiple projects using Laravel, React, React Native, Node.js, Python, WordPress, Joomla, Angular, Next.js, and more.
- Engineered high-traffic websites, such as the Fallout 76 Nuka-Cola merch store, an official campaign site that handled massive traffic during launch.
- Built eCommerce platforms, such as TheBindel, a Texas-focused Airbnb-style platform, and Health Nut, a restaurant brand owned by the Kardashians.
- Built mobile apps using React Native, such as Music by Masses, a mobile app for connecting indie musicians and fans, featuring chat, payments, and user profiles, and Outdoor Exchange, a peer-to-peer platform for outdoor gear rentals.
- Managed full-stack delivery from front to back end and DevOps, including deployments, CI/CD, Docker, server setup, backups, database, emails, and DNS.
- Supported diverse web and mobile projects under tight deadlines, maintaining code quality and business alignment across multiple US-based stakeholders.
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
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 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
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
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
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
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 Logistics Platform
At Termasa, I led the development of a mission-critical logistics platform to control all truck and train loading/unloading operations at one of the world’s largest grain storage terminals. I built the system from scratch, integrating hardware like analog/digital cameras (via custom drivers), Toledo truck/train scales (via serial parsing), and dot-matrix printers using a plugin-based architecture in Delphi (front end) and PHP (back end). The system featured audit photos, quality control logic, FIFO-based inventory, real-time customer portals, and tight integration with the corporate ERP (Totvs) and industrial SCADA systems. It dramatically reduced corruption and transformed logistics across three transportation modalities (trucks, trains, and ships).
Pampa System – Logistics Scheduling Platform
Pampa was developed to solve a massive congestion problem at Tergrasa, the world's 2nd largest grain storage facility in capacity. Truck lines during harvest season would extend up to 20 miles.
I designed and developed the web-based scheduling platform from scratch, allowing customers to reserve time slots for unloading operations. By digitally organizing truck arrivals, this system eliminated physical lines, protests, and operational bottlenecks.
The platform also evolved to prioritize operations based on cargo types and client profiles. I handled the full stack, including back-end logic, front-end interface, database design, integration with the corporate systems, and deployment, ensuring high reliability during peak seasons.
Sistema Pampa drastically improved operational efficiency and is still in use decades after its launch.
I designed and developed the web-based scheduling platform from scratch, allowing customers to reserve time slots for unloading operations. By digitally organizing truck arrivals, this system eliminated physical lines, protests, and operational bottlenecks.
The platform also evolved to prioritize operations based on cargo types and client profiles. I handled the full stack, including back-end logic, front-end interface, database design, integration with the corporate systems, and deployment, ensuring high reliability during peak seasons.
Sistema Pampa drastically improved operational efficiency and is still in use decades after its launch.
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, Node.js, Alexa Skills, Stripe API, WebRTC, OpenAI API, Python Asyncio, Stripe, OpenID, REST APIs, Twilio API, API Development, Vue, Vue 3
Tools
GitHub, NGINX, RSpec, Chef, Apache, Capistrano, Amazon CloudFront CDN, Git, Expo
Languages
JavaScript, PHP, Python, Ruby, Regex, Delphi, TypeScript, C, COBOL, Pascal, Clipper, PyPy, XML, SAML, CSS, HTML, GraphQL, SQL
Frameworks
Laravel, Tailwind CSS, React Native, Next.js, Ruby on Rails (RoR), Angular, Redux, Angular 5, Alexa Skills Kit (ASK), OAuth 2, NestJS, AdonisJS
Platforms
Ubuntu, WordPress, Linux, Docker, Amazon Web Services (AWS), Engine Yard, Joomla, AWS Lambda, Visual Studio Code (VS Code), AWS Elastic Beanstalk, Twilio, Azure
Storage
PostgreSQL, MySQL, Databases, OVH, Amazon S3 (AWS S3), JSON, Data Integration, Elasticsearch, Redis
Paradigms
DevOps, Unit Testing, Mobile Development, Offline-first Development, Real-time Systems, REST, Database Design, Object-oriented Programming (OOP), Test-driven Development (TDD), Automation, Event Sourcing
Other
Web Scraping, SCADA, Hardware Plugins, DevContainers, CI/CD Pipelines, Deployment, Server Management, WebSockets, FastAPI, LangChain, OpenAI, WordPress Plugins, Cloudflare, Web Development, Algorithms, Intranets, POS, PABX, Payment Gateways, Amazon RDS, Pipelines, Libraries, API Integration, OAuth, SAML 2.0, Large Language Models (LLMs), Full-stack, Artificial Intelligence (AI), APIs, Back-end, Back-end Development, Front-end, Front-end Development, Full-stack Development, Third-party APIs, Server-side Rendering (SSR), Containerization, Containers, eCommerce, ERD, Infrastructure as Code (IaC), Hardware Integration, Enterprise Resource Planning (ERP), Serial Communication, Workflow Automation & System Integration, Logistics, Smart Devices, Device Integration
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