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It was the most important moment of my 13+ years of career. It was when I realized that there is always a trade-off in technology. You have to do something intentionally bad in order to succeed as a Small Medium Business in the Digital Transformation. And 70% fail because they insist on doing this very thing well. A while back, when I finally landed a job in a corporation, I was excited that I was going to use state-of-art technology. But, one of my first features immediately added some bugs. As I fixed those bugs, I introduced another, but also other bugs started to pop up caused by previous developers. In laymen terms, it is like a Rubik’s cube. As you carry on assembling the second face, you may accidentally mess up the first bit. It wasn’t like that when I started my career in technology in the civil service a long time ago. Yes, I was frustrated because we used old boring technology. But, we didn’t have to put out the fire all the time because that limited technology prevented us from getting in this position. Coincidence or not, the easiest way to solve the Rubik’s cube is putting constraints. If you move towards, you have to move backwards at some point. Fast forward to nowadays, some of my clients want to create highly customized User Experience. As the project starts to grow, hyper customization introduces more complexity. Then, you make a small change and get unexpected results. You didn't account for all the complex consequences. And this happens again and again, and you can’t avoid it. The software had become brittle. You start to miss deadlines or have to hire more developers to fix cracks faster, and eventually I get hired. That’s the time I have the hard talk: don’t bite more than you can chew, stop chasing the perfect User Experience (good User Interface is not a problem though) with a small team. If a BigTech didn’t have to hire thousands of engineers to provide that, they certainly wouldn’t. Anyway, User Experience is only noticed by B2C clients, and this is where Big Techs thrive. In B2B or internal tool software, who pays for the software won’t even use it. Hey, my name is João, I’m a software architect and developer, feel free to send me a message asking how I can make your business grow. What technologies do I work with? The simple ones: HTML, CSS, Bootstrap, Bash, XML, PostgreSQL, Apache Camel, Apache Knowledge Is Everything, Keycloak. If you need a hypercustomized solution, I can decently program in Java, Python and JavaScript, though. If you have any doubts, don’t hesitate to contact me.

With AI software have became art, and as an experienced Software Engineer with background in prototyping, developing, scaling, architecting, and maintaining large-scale web applications in highly critical environments, serving thousands of users daily, I can help you leverage your product technical level Technologies: - Typescript / Javascript / Python / Java / Ruby - Angular / React / Ionic / Flutter - Microservice / Clean Architecture / SOLID / Design Patterns - AWS / GCP - Docker / Serverless - MongoDB / DynamoDB / Firestore / Postgres / MySQL - Tests (unitary / integration) - CI/CD (Github Actions / Jenkins) Experienced problem solver with strong background in Software Engineering and Agile environments, I do my best to deliver top-notch solutions within time and budget, despite technicalities and tech preferences. If I don't know previously a way to solve your problem, I will find not only a way, but the best way possible with the resources available. My purpose is to let a positive impact into the world, and I do that daily by delivering software solutions and being a good father, son and team member. I believe that everything cooperates for the great. Let's talk and see how can I help your business succeed.

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'm a Senior DevOps Engineer with 7+ years of experience (since 2017) empowering startups and enterprises to design, automate, and optimize cloud infrastructure. My expertise covers AWS, Azure, Kubernetes, Terraform, GitLab CI/CD, and Python scripting, delivering secure, scalable, and efficient solutions. 🔧 What I can help you with: - Infrastructure as Code: Terraform, CloudFormation - Cloud Platforms: AWS (EC2, Lambda, Control Tower), Azure (Resource Manager, AKS) - CI/CD Pipelines: GitLab CI/CD, GitHub Actions, Azure DevOps, Jenkins - Containerization & Orchestration: Kubernetes, Helm, Docker - Automation & Scripting: Python, Ansible, Shell - Monitoring & Observability: Prometheus, Grafana, CloudWatch - Cloud Security & Compliance: IAM, encryption, policies, security audits - Multi-account and Multi-cloud Strategies 🏆 Why work with me: - Top Rated Freelancer on Upwork - 100% Job Success Score - Solid background with companies like Thoughtworks, Kubeshop, CI&T - Proven ability to reduce cloud costs, optimize deployments, and increase infrastructure reliability. Let’s connect to discuss how I can help you scale, automate, and secure your infrastructure with the latest cloud-native technologies.

Hello, and welcome to my profile. I’m new to Upwork, but I’ve been working in the software industry for several years. Now I want to bring my real-world business experience into the freelance market—helping clients build reliable, scalable solutions that solve practical problems and deliver measurable results. I work as a Full-Stack Developer, delivering end-to-end solutions: planning, architecture, backend, frontend, integrations, deployment, and continuous improvements. My recent work includes building robust systems that integrate payment gateways, AI-assisted message management, multichannel communication (such as WhatsApp and Messenger), real-time analytics, and user engagement features. In parallel, I also have solid experience in the mobile ecosystem, including Flutter development, app publishing, and the full release cycle. I’ve worked on real-world mobile projects such as the Teleblock app, and I also bring experience from the mobile telecommunications sector, which strengthened my understanding of reliability, scale, and user-facing operations. Core Skills & Tech Stack: • Frontend: React, Next.js • Backend: Node.js, Java (Spring Boot) • Mobile: Flutter (development + publishing/release process) • Automation: Python • Databases: SQL (relational) and NoSQL (MongoDB and similar) • DevOps: Docker, CI/CD pipelines, VPS deployments, AWS S3 Professional Experience (Highlights) • Built and maintained products and systems end-to-end, including messaging platforms, automations, payment integrations, and analytics dashboards. • Delivered mobile applications with hands-on experience across development, testing, and publishing to app stores (including Teleblock). • Background in the telecommunications/mobile phone sector, supporting operational demands and customer-focused systems. • Worked as a TOTVS RM Analyst/Developer, creating solutions to streamline academic workflows and reduce manual processes. • Served as an IT Analyst in the public health sector, supporting an Electronic Health Record (EHR) environment and ensuring operational continuity. • Automated data workflows and business processes to improve reliability, speed, and scalability. How I work: I value clear communication, clean architecture, and dependable delivery. Whether you need someone to build a solution from scratch, improve an existing system, ship a mobile app, or integrate critical services (payments, messaging APIs, analytics, automation), I can help. Send me a message with your project goals—I’ll respond with a practical plan, suggested architecture, and next steps.

Senior Full Stack Engineer with 8+ years building scalable apps across fintech, payments, logistics, e-commerce (POS) and SaaS — production solutions serving 5M+ users and 10K+ businesses. Currently Software Engineering Coordinator at ConnectPlug, working on online payments, lead erp team and AI-assisted modernization. STACK - Backend: PHP, Laravel, CakePHP, Node.js, TypeScript, REST APIs, Webhooks - Frontend: Vue 3, Nuxt.js, React, TypeScript, HTML5, CSS3, SASS, Tailwind - Mobile: Flutter, Dart - Cloud & DevOps: AWS (Lambda, ECS, S3, CloudWatch), Docker, Kubernetes, CI/CD (GitHub Actions, Vercel) - Databases: MySQL, PostgreSQL, SQL Server, TypeORM - Testing: PHPUnit, Jest, Cypress, TDD, Clean Architecture, SOLID, Agile - AI & Automation: Cursor, Claude, MCP, Copilot — code generation, tests and AI code review KEY ACHIEVEMENTS - End-to-end migration of payment processor handling millions of transactions/day - Modular integration of multiple providers (iFood, Cielo, Google Pay, Apple Pay, Asaas) - Adapted a fintech to a KYC mandate with biometrics and signed webhooks - Optimized critical queries from seconds to microseconds - Reduced 11GB+ Webpack builds to sustainable levels - 3x faster delivery cycles via AI-assisted development - Modernized legacy architectures — frontend migrated to Vue 3, Nuxt and TypeScript; backend refactored from a poorly structured, unoptimized codebase into a modular architecture PROFILE - Engineering Coordinator, Tech Lead, Senior Software Engineer, Software Architect - Distributed systems, performance and scalability - Technical leadership, mentorship, code review and onboarding - Delivery management, milestones, CI/CD and code quality São Paulo, Brazil — Open to Remote, Hybrid and International Open to: Senior Engineer, Staff Engineer, Tech Lead, Engineering Manager, Software Architect, Freelance & Contract Languages: Portuguese (native), English (Professional Working) #PHP #Laravel #TypeScript #NodeJS #VueJS #NuxtJS #React #AWS #Docker #FullStack #BackendEngineer #TechLead #SoftwareArchitect #Fintech #Payments #SaaS #CleanArchitecture #AIAssistedDevelopment #Cursor #SeniorEngineer #DevOps #CICD #RemoteWork