Hire the Best Restful API Freelancers
in Brazil

I build backend systems, APIs and SaaS applications using Python frameworks like FastAPI and Flask. I focus on delivering solutions that are reliable, scalable and built to handle real-world usage. My experience includes developing multi-tenant systems with proper data isolation, structured APIs and backend architectures designed for stability and growth. I can help you: Build complete web applications (frontend + backend) Develop SaaS platforms from scratch Build or improve backend systems Develop and structure REST APIs Fix bugs and optimize existing code Design clean and maintainable architectures I have worked on real projects used in production environments, which means I understand the importance of writing code that works beyond just development. Tech stack: Python, FastAPI, Flask, REST APIs, MongoDB, SQL, Docker, Git, Postman, React, JAVA, C++ If you need a backend developer who can understand your requirements and deliver a working solution without unnecessary complexity, I’m ready to help.

⭐⭐⭐⭐⭐ Rated API-driven automations that turn busywork into business impact. I connect your tools so your team can focus on what matters. Rapid API integrations. Reliable automations. Real results. Since 2009, I’ve helped companies turn messy, manual workflows into reliable automations. With 70+ successful freelance jobs and 7+ years of fully remote work, I design, build, and ship solutions that save time and scale. What I do best -API integration & process automation (core focus) -No-code/low-code: Zapier, Make (Integromat), Bubble -Scripting: Python & JavaScript for custom logic, webhooks, and ETL -Google Workspace: Google Apps Script, Gmail API, Sheets API, Forms, and cross-platform integrations Typical outcomes -Automate repetitive tasks (lead routing, invoicing, reporting) -Connect CRMs, payment gateways, and SaaS tools into one flow -Replace spreadsheets & copy-paste with robust, auditable pipelines -Build “human-in-the-loop” failsafes and clear run logs Toolbox -Zapier (paths, filters, loops, custom Python) -Make.com (routers, iterators, arrays, webhooks) -REST/GraphQL APIs, OAuth2, web scraping, and Django backends -Bonus skills: C/C++/C#, Java, PHP, HTML5/CSS, MySQL, game dev basics Why clients hire me -Proven delivery: 70+ global projects shipped on time -Clear communication, quick iterations, and long-term maintainability Let’s talk -Share the problem you want to automate and the tools you use—I’ll propose a fast, phased plan (MVP → scale) you can approve and run with.

I build fast, reliable web applications that solve real business problems, front end to database, ideas to shipped product. Hi, I'm João Gabriel, a full-stack web developer. Across 10+ Upwork projects (all highly rated), I've delivered tools that automate tedious work, replace manual processes, and turn slow, hands-on workflows into software that runs itself. A few things I've built: - A savings-management platform for an accountant who was running every client's savings plan by hand. I built a dual-interface web app: clients create plans, make installment payments, track their growth, and request withdrawals, while the accountant manages every client, launches new plans, and approves withdrawals from a single admin dashboard. Replacing a fully manual process with one automated platform. (Nuxt/Vue 3, FastAPI, PostgreSQL.) - A lead-generation tool for a music producer that discovers emerging artists on SoundCloud, organizes them in a database, and runs respectful, rate-limited outreach. A system that has brought the producer a steady stream of new clients. - A desktop point-of-sale app for a juice shop, designed around an image-based interface so employees who couldn't read could ring up orders confidently, with built-in inventory tracking for the owner. It served the shop's staff reliably for a long time. My toolkit: Vue 3/Nuxt and React/Next.js (TypeScript) with Tailwind CSS on the front end; Python (FastAPI) and Node.js/Express on the back end; PostgreSQL & MySQL for data; plus REST API design and third-party integrations (OAuth, transactional email, Google APIs). How I work: clear communication, realistic timelines, and delivery on schedule every time. Tell me what you're trying to build and I'll tell you exactly how I'd approach it, before you commit a dollar. Let's talk.

⭐ 25 years as a professional software developer ⭐ Specialized in full-stack (backend heavy) apps with Node.js & React ⭐ Expert in building fast scripts with JavaScript and Python ⭐ Passionate about web scraping and data automation ⭐ Advanced skills in generating dynamic Excel reports ⭐ Strong background across public, academic, and enterprise sectors ⭐ Committed to delivering smart, scalable, and timely solutions ⭐ Experience working on projects in Brazil, the United States, Canada and New Zealand. With 25 years of full-time experience as a Systems Analyst and Software Developer🧑‍💻, I'm now starting my journey as a freelancer, offering both long-term full-stack development and short-term solutions tailored to client needs. Over the past four years, I've been specializing in full-stack web development using Node.js and React, building scalable and high-performing applications. But I'm also deeply passionate about solving quick, practical problems through custom scripts, especially using JavaScript and Python. I have extensive experience creating powerful web scrapers and transforming raw data into structured Excel tables for business use. Throughout my career, I've worked across diverse sectors including public infrastructure, transportation, education, healthcare, and technology R&D. Some highlights include: - Leading the development of a highway maintenance system for DNIT at LabTrans (UFSC) - Building a cloud cost monitoring system using AWS at UNICAMP's Center for Petroleum Studies - Developing a budget management system for IBM US while working with their New York-based team I'm results-driven, adaptable, and value clear communication and quality delivery. Whether you need a robust web application, a fast automation script, a custom data scraper, or well-formatted Excel reporting, I'm ready to help. Although I currently hold a full-time position as a Full-Stack Developer during standard business hours (Monday through Friday), I've organized my schedule to dedicate 30 hours per week exclusively to freelance projects. I split this time between evenings on weekdays and weekends, ensuring that my focus and performance remain uncompromised. This balanced approach allows me to consistently deliver high-quality work to both my full-time employer and my freelance clients. I take pride in managing my time efficiently to meet deadlines and maintain clear, reliable communication throughout every project. Let's connect🤝 and make your project a success!📈

Need a reliable senior full-stack developer to build, improve, or scale your web application? I’m a Senior Software Engineer with 7+ years of experience building scalable web platforms, RESTful APIs, distributed systems, and cloud-native applications using PHP, Laravel, React, AWS, Docker, SQL, Kafka, and RabbitMQ. I help businesses turn complex requirements into clean, maintainable, production-ready software. In previous projects, I designed and developed a system that managed 10,000+ policies and impacted 500+ agencies, improving operational efficiency and supporting scalable business growth. Unlike developers who simply copy and paste AI-generated code, I focus on architecture, readability, maintainability, and long-term system health. Every implementation is evaluated for performance, scalability, and future maintenance. What I can help you with • Build scalable Laravel/PHP, Python applications from scratch • Develop RESTful APIs and backend systems • Improve existing legacy applications built with Laravel, CodeIgniter, or PHP • Build modern React interfaces with Material UI or Tailwind CSS • Design SQL databases and optimize slow queries • Deploy and scale applications on AWS • Set up Docker environments and CI/CD pipelines • Implement event-driven systems using Kafka or RabbitMQ • Improve code quality using SOLID principles, clean code, and best practices • Debug performance issues, server problems, and production bugs Technical Expertise Backend: PHP, Laravel, Python, CodeIgniter Frontend: React, Material UI, Tailwind CSS, responsive UI, API integration Cloud & DevOps: AWS, Docker, CI/CD, Linux, Bash, scalable deployments Databases: SQL, database design, query optimization, high-performance data handling Messaging: Kafka, RabbitMQ, asynchronous processing, event-driven architecture Why clients work with me 🏆 Top Rated 💯 100% Job Success ⭐ 5-Star Reviews ✅ Strong problem-solving and analytical thinking ✅ Clear communication with technical and non-technical stakeholders ✅ Focus on clean, readable, and maintainable code ✅ Results-driven mindset with measurable business impact ✅ Long-term thinking, not quick fixes I’m open to long-term collaborations, complex backend systems, SaaS platforms, API development, cloud deployments, and challenging full-stack projects.

I am a Top Rated Plus freelancer on Upwork and ranked in the top 3% of all freelancers world-wide in my ability to develop reliable Power BI dashboards, Microsoft Fabric data platforms, and automated reporting systems that leadership can trust. I have provided support services to 90+ clients, made $500K+ on Upwork, and received 50+ five-star ratings for helping businesses to turn messy, disconnected and complex data into clear dashboards, scalable data models and reporting environments that are ready for decision-making. I have more than 14 years of experience in Business Intelligence, Data Analytics, SQL, and Microsoft technologies, and specialize in Power BI and Microsoft Fabric solutions that are not limited to just a visualization. My interests are in establishing the solid groundwork for the reporting system: clean data models, optimized SQL layers, reliable pipelines, solid DAX logic, row-level security, and dashboards providing answers to real business questions. When people want me to assist them, they typically ask me questions such as: Why are our Power BI reports slow, unreliable or difficult to maintain? How to make our reporting model scalable? How to transition to a structured Power BI or Fabric reporting system? How can we tie systems such as NetSuite, QuickBooks, Dayforce, Shopify, Klaviyo and Dynamics 365 together in a single report layer? How to provide leadership with accurate KPIs without manual copy/paste each week? How do we get the reporting, alerts, approvals and data refreshes automated throughout the business? Being a Power BI and Fabric expert, I lead organisations to create reporting systems that are fast, structured and scalable, and not just report dashboards that will impress the first day of use. Core Expertise: ✔️ Power BI & DAX Executive dashboards, KPI reports, financial reporting, operational analytics, HR dashboards, sales reporting, complex DAX measures, row-level security, star schema design, report optimization, and semantic model cleanup. Bulkier data sets and reporting structures have been reimagined to make dashboards faster, lighter and easier to maintain. ✔️ Microsoft Fabric & SQL Warehouse Data pipelines (end to end), SQL warehouse, stored procedures, fact and dimension tables, reporting layer, dataflows, data structures in Lakehouse or Warehouse and company-wide datasets. Establish organized structures to facilitate reporting uniformity among teams, departments, and locations. Optimize the data structure and its performance for the application.Optimize the data structure and application performance. Fresh star schemas, optimized SQL queries, repeatable reporting layers, better refresh performance, smaller dataset size, and enhanced data governance. My mission is to ease your reporting environment to scale, audit and maintain. ✔️ Power Automate Automating workflows, notifications in Teams, Adaptive Cards, scheduling jobs, approval flows, API calls, email notifications, and report automation. If you still manually have to move data between systems, I can usually get this automated for you. ✔️ Power Apps Inside apps to enter, approve, inspect, monitor operations, and replace paper or manual spreadsheets. Develop apps that interface with SQL, SharePoint, Dataverse, and other business systems. ✔️ Integrations & APIs Experience seamless integration of data from NetSuite, QuickBooks, Dayforce, Klaviyo, Shopify, Dynamics 365, REST APIs, Excel, SharePoint, SQL databases and more. I can normally import that data into your reporting system if it's available via an API, connector, database, or export. Industries I have worked across include energy, oil & gas, banking, pharma, manufacturing, e-commerce, medical devices, HR analytics and operational reporting amongst others. 💬 Client Feedback ⭐⭐⭐⭐⭐ I have to say “Paulo has been an essential partner in developing our Power BI reports. His technical skills and deep understanding of data visualization allowed us to turn complex data into clear, insightful, and user-friendly dashboards. He was responsive to feedback, quick to implement changes, and often went above and beyond to suggest improvements that added real value to the final product.” I'm in Brazil (GMT-3) and overlap with US business time. I have the opportunity to work with American and international clients on a daily basis and, as such, I do not ever have to worry about communication, documentation, or business context. Your situation is too complex to deal with on your own, so if you're looking for a Power BI, Microsoft Fabric, or reporting automation partner who can help, reach out to me and give me a quick description of your situation. I will be honest about what I'm not good at and what is the next best steps.