Looking for a full stack developer with ANTLR experience -- 5

I am seeking a full-stack software developer with expertise in React, Javascript, Node.js, Postgres, and CSS. Experience with ANTLR is a plus. This is a long-term project in the visual diagramming space. Ideally, looking for someone to help out 30 hours per week for the next 6 months. There is an existing codebase that you will be contributing to. We will pay higher for a talented expert.

Requirements:
- answer screening questions
- answer 3 interview questions in the attached word document
If you are reading my job description, please add 'I am human' on the top of your bid.
Please check the attached doc before bid. Thanks.