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  "markdown": "Co-founder and CEO.\n\nVasek Mlejnsky is co-founder and CEO of E2B, which runs cloud sandboxes where AI agents execute code. He and Tomas Valenta previously built DevBook, an in-browser docs and playground tool whose sandbox technology became the basis of E2B in 2023. E2B raised a $21m Series A led by Insight Partners in July 2025.\n\n- LinkedIn: https://www.linkedin.com/in/mlejva\n\n## What Vasek builds\n\n- [E2B](https://www.anchorterminal.com/tools/e2b.md), graded B, 68.5/100, in Code execution sandboxes. Firecracker microVM sandboxes for agent code, driven from Python and JavaScript SDKs, a CLI or a REST API. Co-founder and CEO, researched 2026-10-27.\n\n## Works with\n\n- [Tomas Valenta](https://www.anchorterminal.com/people/tomas-valenta/), Co-founder and CTO\n\n## Backed by\n\n- [Kaya](https://www.anchorterminal.com/investors/kaya/)\n- [Decibel](https://www.anchorterminal.com/investors/decibel/)\n- [Insight Partners](https://www.anchorterminal.com/investors/insight-partners/)\n- [Sunflower Capital](https://www.anchorterminal.com/investors/sunflower-capital/)\n\n## Questions\n\n### Who is Vasek Mlejnsky?\n\nVasek Mlejnsky is co-founder and CEO of E2B, which runs cloud sandboxes where AI agents execute code. He and Tomas Valenta previously built DevBook, an in-browser docs and playground tool whose sandbox technology became the basis of E2B in 2023. E2B raised a $21m Series A led by Insight Partners in July 2025.\n\n### What does E2B make?\n\nAnchor Terminal lists E2B from E2B. Firecracker microVM sandboxes for agent code, driven from Python and JavaScript SDKs, a CLI or a REST API.\n\n### Who has invested in E2B?\n\nThe sources our research read name Kaya, Decibel, Insight Partners and Sunflower Capital.\n\n### How are Vasek's tools graded?\n\nE2B is graded B, 68.5 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://e2b.dev/about\n- https://www.linkedin.com/in/mlejva\n- https://www.linkedin.com/in/valentatomas\n- https://e2b.dev/\n- https://docs.e2b.dev/support\n- https://e2b.dev/contact\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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