VC investor in next-gen infrastructure software
Partnering at the earliest stages with exceptional technical founders, who build foundational tech blocks for the AI-powered world.
How we work
Varion Ventures is a solo-GP venture capital firm investing up to $500K in pre-seed and seed-stage startups.
We back outstanding technical founders building for the US market, wherever they're based.
Our focus is on next-gen solutions between the application layer and hardware — where our experience and network, especially in open source, can bring uncorrelated added value.
Domain Expertise
Explain your vision to an engineer-investor who actually uses products like yours, not to a generalist VC.
Fast & Simple
Talk directly with the only decision-maker. No deck or product required, though both are welcome.
Collaborative Investor
We don't lead rounds or take board seats, but bring unique expertise and niche connections to the common table.
Flexible VC
Can be your first check, join a round and help shape it, or even invest between rounds — in equity or on a SAFE.
Specialized Support
Active help with hiring top talent, acquiring relevant investors, and gaining unique infra market insights.
Open Source DNA
An experienced thought partner for anything open source — community, monetization, GTM, and beyond.
Konstantin Vinogradov
Konstantin Vinogradov
Tech-savvy investor specializing in open source, AI, and infra software, with over a decade of VC experience, including seed investments in Higgsfield, Mastra, White Circle, Keep (acq. Elastic), and Sidekick (acq. Perplexity). Previously a General Partner at Runa Capital.
Besides investing, Konstantin founded the Open Source Endowment, the world's first community endowment fund for critical open-source maintenance, and created and maintained (2020–2025) the ROSS Index, a quarterly ranking of trending open-source startups.
Having been programming since age 13, with a background in applied math and physics, he loves testing new technologies hands-on and building AI agents for the VC job.
Investments
Selected companies Konstantin has personally backed or led seed investments into as a partner at a previous venture firm.
Higgsfield
AI-powered video generation and editing platform
Mastra
Open-source TypeScript framework for AI agents
White Circle
AI safety and alignment infrastructure platform
Twenty
Open-source CRM, a modern alternative to Salesforce
Rork
AI-powered mobile app development platform
Entire
Next-gen developer platform for humans and AI agents
Archestra
Enterprise MCP platform for AI agents
ZML
High-performance, hardware-agnostic AI inference stack
Dosu
AI-powered developer support automation for OSS projects
Keep
Open-source alerting and on-call management platform
Acquired by
Elastic 
Sidekick
Productivity browser built for work, AI-powered
Acquired by
Perplexity