Senior Developer for Custom E-commerce Web Application

We are seeking a highly experienced Senior Full-Stack Web Developer to program and build a custom, high-performance web application focused on e-commerce and interactive material/finishing product visualization. The developer will transform a fully comprehensive Figma design (built with a mobile-first approach) into a production-ready application. The core feature involves integrating a 2D Simulation/Configurator Engine utilizing pre-processed high-res room scenes and layer masks. Scope of Work & Technical Requirements: 1. Interactive 2D Visualization Engine (Frontend): Develop the rendering core using lightweight web graphics tech like HTML5 Canvas API, Pixi.js, or Fabric.js. The engine must dynamically tile seamless product textures and calculate perspective warping/homography grids to align perfectly with the room geometry. It must apply original shadows/lighting overlays using the "Multiply" blend mode for hyper-realism. 2. Smart Logic Calculator: Program a specialized mathematical script that accepts user room dimensions (Length & Width in meters), computes the net area, applies a dynamic waste percentage factor, and rounds up the required total to the nearest whole box (Ceiling Function) to display automated total pricing. 3. E-commerce & Admin Backend: Build a secure, scalable e-commerce infrastructure containing a shopping cart, multistep checkout, and direct integration with local payment gateway APIs (BBAN, Visa, Apple Pay). Develop a robust Admin Dashboard allowing our team to upload new base scenes/masks, manage the product catalog (SKUs, sizes, prices), and track transactions. Budget: USD 250–750