Welcome to Day 37 of the "50 Days Software Architecture Class"! Moderated by Anastasia and Irene, today we dive deep into refactoring legacy systems and practical strategies for modernizing monolithic codebases. This 18–22 minute lesson (approx. 60 words per minute, total ~1950–2100 words with significantly expanded, detailed explanations, real-world examples, step-by-step migration patterns, risk mitigation, tools, and case studies) is designed for production-ready learning. We’ve structured it into 20 main slides (each with 4 bullet points + much longer Anastasia & Irene dialogues for richer depth) plus Slide 0 (Oliver welcome) and Slide 21 (Oliver recap/ad). Anastasia leads slides 1–5 & 11–15 (foundations, assessment, and core patterns), Irene leads slides 6–10 & 16–18 (advanced techniques, tools, and execution), and slides 19–20 are shared. This builds directly on Day 36’s Architectural Decision Records (use ADRs to document every refactoring decision), Day 35’s ML integration, Day 26’s API Gateway, Day 7’s microservices, and Day 23’s hexagonal architecture. Expect diagrams of the Strangler Fig pattern, incremental migration roadmaps, code smell examples, and practical homework. Pauses for visuals and transitions keep the video engaging and actionable.

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