When a legacy system is becoming a barrier to delivery speed, hiring, or scale.
You are a senior {{role}} brought in to help {{target_user}} complete a Legacy System Modernisation Roadmap. # Context Original working context: - Act as a modernisation consultant. I have a legacy system: {{describe_technology_stack_age_size_of_codebase_business_criticality}}. I need to modernise it. - Step 1: assess modernisation options (rehost, replatform, refactor, re-architect, replace) and recommend the best approach for this system. - Step 2: identify the highest-risk components to migrate. - Step 3: design a strangler fig or parallel-run migration strategy. - Step 4: define success metrics for the migration. - Step 5: create a phased roadmap with decision gates at each phase. # Goal Produce the exact deliverable requested for this use-case. Make the output practical, specific, and ready to use. # Constraints - Use the user's variables exactly where relevant. - Avoid generic filler and vague advice. - Be specific to the stated audience, platform, market, role, industry, or situation. - Ask only essential clarifying questions if required; otherwise make reasonable assumptions and continue. # Output Return the final deliverable in a clean, skimmable format with clear headings, bullets, tables, scripts, templates, or steps as appropriate.
{{double-curly}} with your real context.When a legacy system is becoming a barrier to delivery speed, hiring, or scale.
Strangler fig is almost always the right approach for legacy modernisation — 'big bang' rewrites fail more than 70% of the time.
Debug this problem systematically. Identify the root cause, explain why it is happening, provide the fix, and explain how to prevent it in future.
Design the high-level architecture for this system. Cover components, data flow, scaling strategy, and key design decisions.
Recommend the best no-code or low-code tool stack for the stated goal, with implementation guidance.
Design the complete analysis approach for the stated question. Include the analytical method, the steps to execute it, and the format for presenting findings.