Golang / ReactJS architect

System Engineering | Software Architecture | IT Solution Development | Redux | Ansible | Google GO | TypeScript | PHP | React.js | Agile | Express.js | Single Page Application (SPA) | Middleware | Software Development | Algorithms | Web Development/programming | Back-end development | IT-Architecture | Front End Development | System Development | Software Architect | Rest API | Redis | PostgreSQL | Scrum

Bankas ir Finansai, Reklamos, IT Įmonė, Draudimas, E-Komercija, Technologijų Startup, Nenurodytas

I am Sylvain COMBRAQUE, a full-stack freelance developer and technical speaker with strong expertise in backend and frontend development. I specialize in building scalable, high-performance systems using Go for backend services and React/Next.js for modern web applications. Over the years, I have led critical technical projects, built infrastructure that supports tens of thousands of users, and contributed to the open-source ecosystem with tools like Souin, an HTTP caching solution integrated into the official Caddy module.

My core backend expertise includes Go with tools like gqlgen and oapi-codegen, microservice communication via NATS, and high-quality software practices such as unit testing, mutation testing, race detection, and distributed tracing using OpenTelemetry. On the frontend side, I develop efficient, responsive applications with React, Next.js, and TypeScript, ensuring performance through Web Vitals optimization and clean code architecture.

I am experienced with containerized environments using Docker and Kubernetes for deployment at scale. I manage CI/CD pipelines, implement observability stacks with Prometheus and Grafana, and work with PostgreSQL and ClickHouse for relational and analytical data processing. I’ve also built caching and performance solutions for complex infrastructures and have conducted extensive benchmarking using tools like Gatling and Vegeta.

I have worked on projects for major clients including VINVIN CORP, BNP, Numspot, Platform.sh, and Redbull. My roles have included backend and frontend development, architecture design, infrastructure automation, and technical leadership. As a speaker, I have given talks internationally on topics such as HTTP caching and Go performance at conferences in Tokyo, London, Palo Alto, and other cities.

I offer full-stack development services with a focus on performance, scalability, and code quality. I bring expertise across the entire software lifecycle, from system design to production deployment. My freelance work is backed by over a decade of experience in both client projects and open-source contributions.