• The Engineering Challenge: Stitching high-resolution multi-panel assets inside a web viewport traditionally requires sending gigabytes of media to a server or causes severe main-thread locking and browser crashes during canvas pixel manipulation. • High-Performance Pixel Engine (Dart): Developed a client-side layout math engine that computes dynamic coordinate matrices based on an anchor image. The algorithm automatically calculates proportional padding, margin offsets, and aspect locks without layout reflows. • Main-Thread Protection & Binary Stream Export: Bitwise image concatenation executes in isolated execution chunks with micro-thread yielding, maintaining 60fps UI responsiveness during 4K+ image processing. Final composites are encoded directly to raw JPEG byte streams and piped as HTML5 Blob downloads. • Production Impact & Result: 100% serverless zero-compute cost architecture, instantaneous client-side exports, and seamless panoramic generation across high-resolution image batches.