Add E-Signature Feature to React/Node TypeScript App

We have a working full-stack Credit Card Validator app and need an experienced developer to add e-signature capture (draw/type on screen, submit via API). This is not cryptographic PDF signing or DocuSign integration... (Budget: $30 - $250 USD, Jobs: AngularJS, API Development, Docker, Frontend Development, HTML5, JavaScript, Node.js, REST API)