Hire the Best API Developers
in Brazil

I’m a backend and full-stack engineer. I spend most of my time on slow systems, broken search, and things that shouldn’t require a human sitting there clicking through spreadsheets. Some numbers from a platform with 1.4M+ users: • Migrated 100+ production queries to a new data warehouse. Average execution went from 190s to 2s. • Built a search relevancy pipeline (Elasticsearch + cross-encoder reranking). Went from 80% to 96% relevancy, measured through iterative benchmarks. • Automated a report that took someone 2 hours of pulling from multiple spreadsheets. Runs in 5 minutes now. Day to day I work across: • Backend and APIs — Django, FastAPI, Node.js/Express, REST, WebSockets • Search — Elasticsearch, semantic search, reranking pipelines • Data — BigQuery, PostgreSQL, Redis, Airbyte, ETL, query tuning • Automation — Python/Selenium, Puppeteer, workflow scripts • Infra — Docker, CI/CD, Heroku, Cloudflare • Some frontend when needed — React, TypeScript I scope upfront and flag trade-offs before they become problems. I reply fast (under 30 minutes during work hours) and I don’t disappear mid-project. Top Rated on Upwork.

✨ 100% Job Success, 3243+ hours worked, Top Rated Plus - Python (Django and more) Software Engineer | Azure Certified | Full-Stack Web & API Developer | 15+ Years of Expertise ✨ Bringing your vision to life with precision and innovation. I am a highly skilled and versatile software engineer with over a decade of experience in building scalable, secure, and optimized web applications and APIs. I excel in both frontend and backend development, delivering robust, user-centric solutions that align with your business needs. Core Skills & Expertise: Backend Development: Python (Django, FastAPI), Node.js Frontend Development: JavaScript (React, Vue), HTML5, CSS3 Full-Stack: Django, Flask, Full Software Development Lifecycle (SDLC) DevOps & Infrastructure: Docker, AWS (EC2, S3, Lambda), Azure DevOps, CI/CD pipelines Version Control & Collaboration: Git, GitHub, Bitbucket Database Management: PostgreSQL, MySQL, MongoDB API Development: RESTful APIs, GraphQL, WebSockets What I Bring to the Table: Custom Web Applications & APIs: Design, build, and scale custom solutions tailored to your needs. Application Modernization: Upgrade legacy systems with modern technologies and best practices. Scalable Backend Systems: Architect secure, efficient backends for enterprise-grade applications. Automated Deployments: Implement CI/CD pipelines to streamline infrastructure and code deployment. Collaborative Approach: Work closely with clients and teams, ensuring transparency and alignment. Why Work With Me? Proven Track Record: Over 10 years of delivering successful projects across industries. Strong Communication: Clear, consistent updates to keep you involved in the process. Problem Solver: Innovative, out-of-the-box solutions for complex challenges. Results-Oriented: Focused on achieving your project goals with high-quality outcomes. Client-Centric: I prioritize your vision and ensure it reflects in the final product. Let’s take your project from concept to reality. Reach out, and we’ll make it happen!

I build backend automation systems that connect APIs, process data, and deliver results — without the manual work. My focus is on three areas: API & Webhook Integration: Connecting third-party services (payment APIs, CRMs, marketing platforms) and building event-driven workflows that respond automatically to real-time data. AI-Powered Tools: Building chatbots, automation pipelines, and data extraction systems using OpenAI and Claude APIs — from simple integrations to multi-step agentic workflows. Data Pipelines & Automation: ETL systems, web scrapers, and scheduled data collection tools that deliver clean, structured output to Google Sheets, databases, or any destination you need. My last client said I delivered a dataset that "would have taken most far longer" — completed in under 24 hours. If you need something built fast and built right, send me a message.

Network Engineer adventuring in the DevOps culture. My interests are cloud computing, IoT, System Design, Infra as Code and telecommunications. 4x AWS Certified 1x Azure Certified Medium : medium.com/@thalesvon GitHub: github.com/thalesvon

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.