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. Existing stack (already built): Frontend: React, TypeScript, Vite, CSS Modules, custom fintech UI (blue theme, responsive, accessible) Backend: Node.js, Express, TypeScript with clean architecture (routes, controllers, services, validators, middleware) Monorepo: npm workspaces Testing: Vitest (backend unit/integration + frontend component tests) Deployment: Docker Compose ready What you will build: Signature UI Canvas signature pad (mouse + touch) Optional typed signature mode Clear, undo, and basic validation (e.g. reject empty signature) Integrate into existing page layout and styling API integration New backend endpoint(s), e.g. POST /api/signature Request: signature data (base64 PNG/SVG), optional signer name Response: success payload with signature ID/URL, timestamp, and metadata Proper HTTP status codes, input validation, and error handling Backend logic Follow existing project structure (controller → validator → service) Validate payload size/format Return signature as PNG or SVG + metadata (timestamp, optional signer name) No database required unless you propose file storage and we agree UI/UX Match current fintech/healthcare aesthetic (rounded corners, soft shadows, blue theme) Mobile-friendly and keyboard accessible Visible focus states and screen-reader friendly labels Testing Backend: unit tests for validation/service logic + API integration tests Frontend: component tests + user interaction tests (draw, clear, submit) All existing tests must continue to pass Documentation Update README with new API contract, setup notes, and any new env vars Requirements: Strong experience with React, Node.js, and TypeScript Experience with canvas signature libraries (signature_pad, react-signature-canvas, or similar) Solid understanding of REST APIs and clean code practices Ability to write meaningful tests, not just happy-path coverage Good communication and ability to work from an existing codebase Deliverables: Feature implemented in our private GitHub repo (via PR or agreed branch) Working local setup (npm install → npm run dev → feature works) Brief summary of your approach, libraries chosen, and trade-offs List of any new environment variables or config changes To apply: Type "E-Signature" at the top of your proposal and include: Links to similar work (signature/canvas/form projects) Your proposed approach and library choice Estimated timeline and fixed-price quote Any questions about scope before starting Repo access will be granted after we shortlist and agree on terms.

Project ID: 40523571