Artur S.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 Nov 5, 2026.

AI/ML Staff Engineer with 9+ years of experience in AI, machine learning, and scalable web applications. Expert in LLMs, Transformers, reinforcement learning (PPO/DPO/RLHF), multi-agent orchestration, and recommendation systems, with hands-on experience deploying production-ready solutions on AWS. Proven impact includes boosting model accuracy by ~20%, increasing user engagement by ~40%, and reducing downtime by ~50%. Strong collaborator, mentor, and problem solver, bridging research, engineering, and product to deliver high-impact solutions.