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Casco (YC X25) Logo

Software Engineer

Casco (YC X25)

From $200,000
Sep 16, 2025
San Francisco, CA, US
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Building AI agents that break into systems (legally) to craft the core of an agentic red teaming platform, enabling autonomous systems to discover vulnerabilities.

Requirements

  • Strong TypeScript experience: You know the language deeply and can architect complex systems with it
  • Agent building experience: You've built autonomous systems, agents, or similar "smart" software that makes decisions independently
  • Cloud native experience: You've built on cloud services and know distributed systems
  • Security-minded: You have basic understanding of cybersecurity concepts (or genuine excitement to learn them)
  • Self-directed execution: You see problems and fix them without waiting for permission or detailed instructions
  • Track record of shipping products in fast-paced environments
  • Open source contributions or side projects showing your passion

Responsibilities

  • Build agent systems: Design and implement autonomous agents that conduct security assessments.
  • Ship with autonomy: Own features from conception to production without someone looking over your shoulder
  • Make smart tradeoffs: Balance speed and scalability in a startup environment where perfect is the enemy of shipped
  • Write TypeScript without any: Build robust, maintainable systems that can handle the chaos of autonomous security testing
  • Learn security on the fly: You don't need to be a security expert, but you should be pumped about learning how hackers think
  • Communicate clearly: Explain complex technical decisions to teammates and write documentation that actually helps

Other

  • Collaborate cross-functionally: Work directly with security engineers and customers to turn ambitious ideas into reality
  • Collaborative mindset: You actively seek input from others and make the team better
  • Excellent communication: You write clearly, explain complex ideas simply, and aren't afraid to overcommunicate
  • Startup-ready: You thrive in ambiguity, make decisions with incomplete information, and adapt quickly
  • AI optimism: You believe AI will fundamentally change software and want to be part of making that happen