Serg Metelin

I lead developer advocacy in the Americas for Hashgraph. Before that I ran DevRel at Block.one, and before that I cycled through CTO roles and agency tech work in Sydney — including a social-apps studio that hit ten million users at peak, and a lunch-delivery service that ran on SMS and one of the earlier Messenger bots.

I'm based in Arlington, Virginia. I grew up in Ukraine, spent a long stretch in Australia, and speak English, Russian, and Ukrainian.

You can find me on LinkedIn, GitHub, or email sm@sergmetelin.com.

Writing

• May 20, 2026 New site

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