twenty · Arlington, VA
Skills: TypeScript, Python, Rust
ABOUT THE COMPANY America is under sustained cyber attack. Our adversaries infiltrate our networks, steal our IP, and degrade the digital infrastructure that modern life runs on. They’ve learned—correctly—that those attacks rarely produce consequences. Twenty was founded to change that, by making our adversaries think twice before they attack us. Our vision is American and allied primacy in cyberspace—a future where they cannot contest us, deterrence is assured, and the free world remains secure. Founded in 2024, Twenty Technologies (www.twenty.io http://www.twenty.io) industrializes offensive cyber operations for the U.S. and its allies. Headquartered in Arlington, Virginia, Twenty has raised $168M from Khosla Ventures, Accel, Caffeinated Capital, Friends & Family Capital, Point72 Ventures, General Catalyst, and In-Q-Tel. Mission | On Site | Full Time | U.S. Citizenship Required / No Active Clearance Required ROLE SUMMARY You’ll build an agent environment at Twenty, with an interaction model similar to Claude Code and Codex. Users will give it tasks, supply context, and review its work. They’ll need to see what it’s doing and be able to intervene when it gets something wrong. Your work will center on the agent harness: the code that assembles context, executes tool calls, tracks progress, and coordinates delegated work. You’ll decide how information carries across a session, how the agent checks its results, and how it recovers when a step fails. You’ll write production software in Python, TypeScript, or Rust and maintain it after launch. Expect to spend time investigating failed runs, testing changes to the harness, and working with users to understand where the system needs improvement. WHAT YOU’LL DO - Build agent harnesses. Write the execution loop that calls the model, runs tools, records results, and determines the next step. Set time and cost limits. Define stopping conditions and detect runs that repeat work without making progress. - Manage context. Choose…
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