Sergio Mazzaroni

I’m a Senior Full Stack Software Engineer with 13+ years of experience designing, building, and scaling enterprise and SaaS applications for startups and large technology companies. My background spans high-impact roles at Amazon, healthcare and SaaS startups, and consulting firms, where I’ve consistently worked on production-critical systems used at scale.

My core expertise is in C# and .NET Core for backend development, with a strong focus on clean architecture, SOLID principles, asynchronous processing, and scalable API design. I’ve built and maintained distributed systems and microservices, designed APIs consumed by multiple clients, and improved system reliability through monitoring, automation, and observability. I’m comfortable working in regulated environments, including healthcare, with a strong emphasis on security, reliability, and data integrity.

On the frontend, I have extensive experience with React, Next.js, TypeScript, and modern JavaScript tooling. I’ve built performant, maintainable user interfaces and collaborated closely with product and design teams to deliver features end-to-end. I’m equally comfortable working across the full stack or focusing deeply on backend architecture.

I have strong experience with cloud and DevOps practices, including AWS, Docker, CI/CD pipelines, and relational databases such as PostgreSQL, SQL Server, and MySQL. I regularly optimize database queries, improve deployment pipelines, and contribute to architectural decisions that support long-term scalability.

I actively leverage AI-assisted development tools such as GitHub Copilot and Cursor to accelerate feature delivery, refactor legacy systems, improve test coverage, and reduce boilerplate—while maintaining high engineering standards and sound technical judgment. I enjoy mentoring, participating in design discussions, and working closely with founders and stakeholders to align technical solutions with business goals.

I’m particularly interested in roles where I can work on complex backend systems, modern full-stack applications, and scalable SaaS platforms—especially in remote, agile teams that value clean architecture, thoughtful system design, and continuous improvement.