Sergei B.

I’m a Full-Stack / Backend Engineer with 12+ years building and evolving complex, high-load SaaS systems. I work both on greenfield products and mature systems, helping businesses move from early concepts to stable production platforms. I also modernize legacy codebases through gradual, low-risk transitions, reducing technical debt and evolving architecture without disrupting ongoing operations. My core focus areas include: - Designing and scaling web applications and SaaS platforms - Improving performance, reliability, and system stability - Reducing technical debt in growing codebases - Designing architecture and implementing core business logic - Delivering production-ready features in collaboration with teams and stakeholders - Integrating LLMs and generative AI workflows into production systems (API-based and GPU-hosted models) Primary stack: - Languages: PHP, JavaScript, TypeScript, Python, Golang - Frameworks: Symfony, Node.js, Vue.js, FastAPI, Flask - Cloud & Infrastructure: AWS, Cloudflare (including edge computing) - DevOps & Tooling: Docker, Git, Linux CLI I value clean architecture, pragmatic engineering decisions, solid test coverage, and long-term maintainability. My goal is not just to ship features, but to build systems that remain stable and sustainable over time. I integrate easily into existing teams or work independently, maintaining clear communication with product and business stakeholders throughout the delivery process.