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Hello there and welcome to my profile! I'm Daniel, a Full-Stack Developer with a decade of industry experience and a Bachelor's in Computer Science. I specialize in building and maintaining backend applications using C#, .NET, and relational databases. My expertise also extends to front-end development with experience in Angular and React. My background includes not only new development but also diving into existing codebases to resolve complex bugs and implement new features. I thrive on challenges and enjoy exploring new technologies to find the best solutions. While I am new to Upwork, I have extensive experience in remote work and independent project management, ensuring clear communication and on-time delivery. I am passionate about writing clean, efficient code and creating solutions that meet and exceed client expectations. As a native Portuguese speaker with fluent English and Spanish, I can seamlessly collaborate with diverse teams. Let's connect to discuss how I can help you achieve your project goals.

Software architect with over 8 years of experience specializing in cloud-based backend solutions, microservices, and scalable APIs. I design and implement architectures that meet high-performance demands, optimize user experience, and enable seamless integration across systems. Cloud-Native and Microservices Architectures: Skilled in breaking down monolithic applications into microservices using .NET, Azure, Kubernetes, Docker, and gRPC, supporting millions of active users and high transaction volumes. Experienced with CI/CD pipelines in Azure DevOps, containerization with Docker, and Google Cloud services (StateStore, Cloud Storage, Pub/Sub) for reliable scalability and resilience. Enterprise Integration and Real-Time Data: Proficient in integrating complex systems using Kafka, RabbitMQ, and Redis Pub/Sub for messaging, and managing data with PostgreSQL, MongoDB, Oracle, and Redis. My solutions are built for real-time processing and optimized for high availability. Secure, High-Performing APIs: I develop APIs focused on security and performance, implementing authentication and authorization with Identity Server, Auth0, Firebase, Azure Entra External ID along with observability, health checks, and error resilience. My APIs are thoroughly documented for easy integration and long-term maintainability. Legacy Modernization and Frontend Expertise: I bring legacy systems into modern architectures, leveraging .NET Core and Angular to create efficient, maintainable applications. Additionally, I have experience building responsive interfaces with Angular, React, and Flutter. Agile and DevOps Advocate: I work in agile teams, prioritize clean code and best practices, and ensure continuous improvement through structured CI/CD, monitoring, and automated testing. Passionate about delivering high-quality, cloud-based solutions that drive business value and user satisfaction. Azure Services: DevOps, App Service Plan, App Service, Functions, Container Apps, Monitor, Application Insights, Key Vault, VNET, SubNET, NSG, Private Endpoints, Storage, SQL Server, Redis, Entra ID, AD, VMs, Container Registry, Kubernetes, APIM, Logic Apps, WebJobs, Service Bus, Cosmos DB, Development: .NET (3–9) - Framework and VB, C#, Angular, React, Minimal API, Vertical Slice Architecture.

I build production-ready cloud applications that are designed to scale. As a Senior Software Engineer, I specialize in .NET, AWS, React, and modern backend architecture, helping startups and enterprises build reliable systems that perform under real-world workloads. Some of the projects I've worked on include: • Built and maintained a medical imaging platform processing 500+ imaging studies every day, focused on performance, reliability, and continuous operation. • Designed and deployed cloud infrastructure on AWS, using ECS, EC2, RDS, Redis, S3, CloudFront, and Docker to support scalable production applications. • Developed high-performance ASP.NET Core APIs serving web and mobile applications with clean architecture and maintainable code. • Built modern frontends with React, creating responsive, user-friendly applications integrated with real-time backend services. • Optimized SQL Server and PostgreSQL databases through query tuning, indexing strategies, stored procedures, and performance analysis. • Developed real-time systems using WebSockets and Redis, supporting live communication and low-latency data synchronization. • Built cross-platform mobile applications with .NET MAUI, sharing business logic across Android and Windows. I use AI-assisted development with Claude Code and modern LLM workflows to accelerate delivery, improve code quality, and automate repetitive engineering tasks, without compromising maintainability. My core technologies include: • C# • ASP.NET Core • React • JavaScript • AWS • Docker • ECS • PostgreSQL • SQL Server • Redis • REST APIs • GitHub Actions Whether you need to build a new product, modernize an existing system, optimize performance, or scale your cloud infrastructure, I focus on delivering software that is reliable, maintainable, and ready for production from day one.

Senior Full-Stack Architect/Engineer specialist in building scalable SaaS platforms using Node.js, React, Golang and cloud infrastructure and or microserces. I am a constantly updated programmer with 30 years of experience in software development and over 15 years as a software/solutions architect. I can develop/solve applications in 99% of areas or niches. How I can help you: • SaaS platform development • Microserces platform development • Scalable platform development • API development • API Integrations • Event Oriented Architecture • Scalable backend architecture • REST APIs and microservices • Cloud infrastructure and DevOps • System modernization and performance optimization • MVP development for startups • Enterprise-level system architecture • Figma → Software • Systems Web • Ecommerce • Landing Pages • Website • PWA • Mobile Aplication ( Android, IOS) • Server Configuration • Software Achitecture • Cloud Architecture • TDD • DDD • Clean Architecture Technologies Backend: Node.js, NestJS, TypeScript, Java, GoLang Frontend: React, Next.js, HTMX, Html, CSS Mern Stack, Infrastructure: Docker, Nginx, Certbot, PM2, Kubernetes, CI/CD, AWS - Amazon Web Services, Google Cloud, Microsoft Azure, Digital Ocean, Hetzner, Linux Automation: DevOps, Ansible , Terraform, Prometheus, Grafana , traefik Architecture: Microservices, Event-Driven Architecture, DDD, High Availability Systems, Distributed Systems I am a native Brazilian Portuguese speaker. I can handle technical communication in English, including reviewing and translating audio and video materials with the support of AI tools, so feel free to send them if helpful. I also understand Spanish very well. Portuguese is my preferred language for meetings. Experience I have worked on large-scale systems, including banking platforms, enterprise systems, streaming platforms, large e-commerce sites, and SaaS products used by thousands of users. I also have experience designing high-availability systems from scratch to deployment, building microservices architectures, and helping companies scale their infrastructure. Technical career leader. I already have led multiple teams on simultaneous projects. And in a large consulting and outsourcing company I led 3000 programmers in different teams for clients in the banking sector. If you are creating a startup, a SaaS platform, or an enterprise system, I can help you design the architecture and implement the solution. If you want to be sure your candidate is the right one and technically suitable for your project, I also conduct technical interviews to evaluate software engineers. I help companies quickly validate candidates and determine if they are the right fit for the role in a structured 30-minute technical conversation. I can tell you which of your candidates is the best for your project. I also help refine your project description. Let's talk about your project.

Full-stack web Developer with experience developing web applications using Angular, React, Node.js, Express.js, and NestJS. I have a 100% job success rate and a track record of delivering more to clients on the platform in short and long-term jobs. Although developing web applications has been and probably will still be my best skill for some time, I'm always keen to learn new technologies and improve my knowledge. I've developed many different types of systems and I'm sure we would do a great job together. I'm available to chat anytime if you would like to ask questions about my skills and/or your project. ✅ Languages: Javascript, Typescript, C#, Python ✅ Frontend: React, Next.js, Angular ✅ Backend: Node.js, Express.js, NestJS, .NET Core ✅ Databases: PostgreSQL, MySQL, MongoDB, Firebase Firestore

My name is Fabio Silva, I am married and I work with programming for about 27 years. I love creating new interesting programs! * My strong points: - I am an expert in C# and .Net, but I can adapt myself very easily and quickly to any different language and technology. I have strong experience in migrating older systems, databases, and legacy languages to modern alternatives. - I am experienced in Code Reviews, especially for C# and Javascript. - I have great experience in finding and troubleshooting hard bugs, even with limited data and information, and even with hard access environments. - Due to my experience, I usually provide a great range of creative solutions and alternatives to the most diverse problems. * My current specialization: - My focus is C# and .Net Core, in any area where it can be leveraged. - On the web, I work on Asp.Net Core using Microservices, Razor Pages, MVC, and WebApi, and some quick tasks with Blazor. In the front end, I work with Plain Javascript and React, KnockoutJS, with some experience in Angular. - On the desktop, I'm good at creating Console, Windows Forms, WPF, and Avalonia apps. - I work mostly with Microsoft SQL Server, PostgreSQL, and SQLite databases. - I work with Git daily as shared source control, with experiences in GitHub and BitBucket. - Finally, I can do cross-platform development (Linux/Windows/macOS). And in any case, I can deploy to docker containers. * Other talents: - Languages like Basic, Clipper, Visual Basic (and VB.Net), Borland Delphi - Databases like MySql, Interbase/Firebird - Other like PowerShell Scripts, Selenium WebDriver