The pieces of your software?

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• Web application with HTML interface?
• Web application with HTML + JavaScript? Which frameworks?
• Web application with JSON interface? (API)
• What kind of databases do you have in the system? SQL? NoSQL? What size is the database?
• Source and the format of your input? Zip? CSV? XML? SQL Dump? JSON?
• The format of your output? HTML/PDF/CSV/JSON/XML/Excel/Email/..?
• Are you pushing out your results or are your cliens pulling them? e.g. via an API?
• What external dependencies do you have? Slack, Twilio, What kind of APIs?