Am I correct in understanding that you were a Full-stack analyst — performing both business analysis and system analysis?

Yes, the term "Full-stack analyst" usually means that the specialist is involved in both business analysis and systems analysis. This means they not only gather and formalize business requirements but also participate in designing technical solutions, analyze system architecture, and interact with developers and testers. Such an approach allows for a better understanding and integration of business needs with technical capabilities, ensuring a higher quality result.