Registration Backend Development, I Have Frontend

I’m building a compact registration system and need a skilled backend developer to complete the core infrastructure. The application must store registration data in a MySQL database, generate admit cards and registration slips in PDF format, and allow administrators to create manual entries that are saved just like online submissions.

Key elements I want you to handle:
• Database layer – design the schema and write the queries/ORM code to capture every registration field, plus logs for audit and troubleshooting.
• Payment flow – integrate Razorpay so the user can pay, receive an on-screen confirmation, and trigger creation of the PDF registration slip only after a successful callback.
• Admit card generation – automatically compile the stored data and produce a clean, templated PDF that candidates can download anytime.
• Admin tools – a secure screen where staff can upload question papers (PDFs) and perform manual registrations that feed straight into the same tables.

I’ll supply the hosting environment and any UI assets; you focus on robust, well-documented backend code. Tell me your expected timeline, milestones, and total price so we can get started right away.