Lev Gen
Technical SEO specialist and WatchThis author
Lev Gen leads the methodology and educational content for WatchThis. His work focuses on technical SEO, JavaScript rendering, crawlability, indexing and the way search engines and AI systems access web content.
At WatchThis, Lev writes and reviews practical documentation for developers and SEO professionals. The goal is to explain rendering problems with reproducible tests, clear limitations and recommendations that can be verified independently.
Lev also works with Prime Digital, a Canada-based SEO and GEO company.
Areas of focus
- JavaScript SEO
- Raw HTML and rendered DOM analysis
- Technical SEO audits
- Crawlability and indexability
- Structured data
- Search and LLM visibility
Follow and contact
Articles by Lev Gen
- React SEO Guide: Rendering, Metadata and Indexing — Learn how to make React applications discoverable with server rendering, static generation, crawlable links, metadata and structured data. (2024-01-15 · updated 2026-09-17)
- JavaScript SEO Basics: Crawling, Rendering and Indexing — Understand how search engines process JavaScript and how to keep important content, links, metadata and structured data discoverable. (2024-01-05 · updated 2026-09-17)
- SSR vs CSR vs SSG: SEO Differences Explained — Compare server-side rendering, client-side rendering and static generation for crawlability, indexability, performance and maintenance. (2023-12-20 · updated 2026-09-17)
- How to Debug JavaScript Rendering Problems — A practical workflow for finding rendering problems with initial HTML, Chrome DevTools, Search Console and the WatchThis comparison report. (2023-12-15 · updated 2026-09-17)