Mateusz G.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Aug 13, 2026.

I am an AI Full-Stack Engineer with a strong focus on backend systems and AI/ML-driven architecture, building intelligent applications powered by large language models and modern data pipelines. My work centers on designing scalable AI systems that integrate LLMs, multi-agent workflows, and retrieval-based reasoning into real-world products. I specialize in developing robust backend infrastructures that handle complex AI orchestration, context management, and high-throughput data processing, while maintaining clean and intuitive user interfaces when needed. I have hands-on experience building end-to-end AI platforms, including RAG systems, agent-based automation, and real-time AI services. My approach combines solid software engineering principles with advanced AI techniques such as prompt optimization, model evaluation, and tool-augmented reasoning. I focus on performance, reliability, and production readiness, ensuring AI systems are not just functional but scalable and maintainable. I enjoy working on challenging problems that require bridging backend engineering with intelligent decision-making systems.