E-commerce SEO for BigCommerce, Shopify, WooCommerce, or Magento starts with understanding each platform's technical limitations and native capabilities. BigCommerce offers decent out-of-box SEO with customizable URLs, automatic canonical tags, and schema markup, but still needs manual optimization for product descriptions, metadata, and internal linking architecture. The core agency workflow involves a technical foundation audit covering crawlability, duplicate content issues from filter URLs and pagination, site speed (especially mobile), and proper implementation of product schema. BigCommerce specifically allows access to theme files and headless options, giving agencies more flexibility than locked platforms like basic Shopify plans. You audit redirect chains from discontinued products, fix orphaned pages, and ensure faceted navigation doesn't create indexation nightmares. Content strategy focuses on category pages as the primary ranking targets since they support broader commercial keywords than individual product pages. Product pages get unique descriptions (never manufacturer copy), optimized titles following tested formulas like "[Product Name] - [Key Feature] | [Brand]", and image alt text that balances accessibility with keyword relevance. Most agencies template this work to scale across hundreds or thousands of SKUs. Technical implementation varies by platform: - BigCommerce and Magento allow deeper code access for custom schema, hreflang tags, and advanced speed optimization - Shopify requires apps or Liquid theme edits for comparable functionality - WooCommerce offers unlimited customization but demands careful caching and database optimization to maintain speed at scale Ottawa SEO prioritizes site architecture early because fixing taxonomy and URL structure after launch costs 10x more than planning it correctly. We map keyword clusters to category hierarchies, implement breadcrumb schema, and build internal linking logic through related products and buying guides. For competitive niches, we layer in editorial content hubs that link strategically to commercial pages without diluting crawl budget. Link building targets category pages and high-value product lines rather than spreading authority thin across thousands of product URLs.