@bserefaniuk
Senior Software Engineer | Building Scalable Backends & AI-Driven Solutions with Node.js & Python
A highly experienced software engineer with deep expertise in backend development, system architecture, and integrating AI into real-world products. Over the past seven years, I’ve built and evolved high-impact applications across industries — from healthcare and fintech to search platforms and digital marketplaces — always with a focus on performance, scalability, and maintainability. My core stack revolves around Node.js, Python, and modern cloud ecosystems (AWS, Azure, GCP). I excel at designing robust APIs, event-driven architectures, and distributed systems, while seamlessly embedding AI capabilities such as intelligent chatbots and knowledge-driven assistants. Though I can contribute to frontend tasks when needed, my passion and primary focus lie in the backend and infrastructure layer, where clean architecture and technical excellence matter most. I’ve led engineering initiatives — mentoring teams, shaping technical strategy, and guiding discovery phases — but I thrive most as a hands-on engineer solving hard problems and shipping reliable code. I’m adaptable to evolving technologies, with experience across TypeScript, Nest.js, FastAPI, GraphQL, PostgreSQL, Redis, and beyond. Currently based in Barcelona, Spain, I collaborate globally and work comfortably in distributed teams. Excited by projects that push boundaries, integrate AI to create smarter user experiences, and demand thoughtful, scalable engineering.
I’m a Senior/Lead Node.js and AI (Python) engineer with 7+ years of experience delivering scalable backend systems across fintech, healthcare, marketplaces, and AI-driven products. I’m open to long-term collaborations (Spain contract or B2B/autónomo), ideally remote-first or hybrid in Barcelona. What I do best: • Design and lead backend architecture, API ecosystems, and data flow strategy. • Build AI-powered features using FastAPI, LangChain, LangGraph, and Azure OpenAI. • Ship production-grade services with Node.js, TypeScript, PostgreSQL, and Redis. • Integrate Python and Rust modules into Node.js systems for performance or ML workloads. • Mentor engineers, establish technical standards, and keep delivery pipelines clean and predictable. I’m currently available for intro chats about backend architecture, AI integrations, or high-impact engineering roles.
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