Refactoring of the system of approval of applications for payment on 1C 8.3

There is an existing system for agreeing payment applications. Self-written, uncomplicated. Since writing, it has been consistently made about 10 improvements on demand, and for further development, the system requires reworking the existing configuration. I know how to recycle it.
Redesign the configuration and implement new (current) requirements.
Conditions:
- joint development of technical specification with me (15 years of experience in the development and implementation of systems on 1C: Rarus, ITRP, RUSAL, etc.) and the customer;
- mandatory experience in independent development of configurations or functional blocks;
There are several meetings with me and the customer (D). Moscow).
- my estimate of the duration of the project: a month and a half.

Payment for two stages: development of TK, configuration of the system (programming). Amount agreed.