IBM IIB Code Analysis Docs

I have a running IBM Integration Bus (IIB) solution whose original authors are no longer available. I now need a fresh set of eyes to walk through the entire codebase, reverse-engineer its behaviour and give me clear, usable documentation... (Budget: ₹400 - ₹750 INR, Jobs: API Integration, Documentation, Project Management, Reverse Engineering, Software Architecture, Software Documentation, System Analysis, Technical Writing)