This checklist works for tech companies, SaaS platforms, and software vendors that sell to businesses or enterprises. It assumes your site already exists and you're either starting SEO or fixing gaps from past attempts.
If you're a very early-stage startup with minimal content, skip to Phase 1: Technical Foundation. If you've been doing SEO for 12+ months but traffic has plateaued, jump to Phase 3: Authority & Depth.
This is not a guide for agencies offering SEO services (different sales funnel), consumer apps without business-to-business positioning, or companies still in pure stealth mode.