About

I'm Constantin Oesterling, and I founded Infinitnet in July 2016. I rank websites, mostly my own, and I test every strategy on my own sites before I recommend it to anyone. My current focus is affiliate sites, local lead generation and SaaS platforms.

I also provide performance-based SEO for ecommerce and SaaS companies, integrating AI tools and automation workflows. There are no standard packages. Every site, niche and SERP is different and needs its own strategy, which is why an audit is always the best first step.

Where I come from

My SEO journey started in server rooms, not in marketing departments. I began in 2009 as a freelance Linux administrator. My work still starts with flawless technical foundations and effective on-page optimization, then adds strategic link building and traffic manipulation techniques where they fit.

How I test

I would rather run the experiment than repeat the theory. These tests and write-ups are published on this site:

• Cora SEO review and rank-this-page experiment: a test page tracked over months, from its first position through several updates.
• Free on-page SEO tool case study: a page that reached position #8 for its target keyword 37 hours after on-page changes.
• Is traffic a ranking factor?: a 2020 test of whether traffic influences rankings.
• Long clicks vs short clicks: tracking user satisfaction metrics for SEO.
• Niche topic research with Reddit, N-grams and NER: a research workflow built on my own N-Gram Analyzer.

Tools I build

I build free tools for my own SEO work and publish them for everyone. They are all on the tools page. I also publish WordPress plugins and open source projects on GitHub. One of my plugins is active on more than 2,000 WordPress sites.

Community

I took part in the Holistic SEO Mastermind in Kusadasi in 2024 and 2025. I work in English and German.