Founding Engineer (0 - 4 YoE) San Fran

About the position

Job Description: Seniority 0 - 4 years of experience in full-stack software engineering, building production systems and user-facing features Work experience Experience at a B2B SaaS company or VC-backed tech startup e.g. Scale AI or Decagon Experience building AI/ML products, especially with LLMs or AI agents Education Undergrad in CS Olympiads, RSI (Research Science Institute), and other high school competitions Hard skills Systems thinking: understand distributed systems, concurrency, and performance optimization Full-stack expertise, strong with TypeScript, React, Next.js, and Python Soft skills High agency and ownership; proactively identifies and solves problems Traits to avoid Engineers who are frontend-only Candidates who require significant step-by-step direction to complete tasks Individuals from large enterprise, slow-moving e.g. SAP, JP Morgan About this role About the role As a Founding Engineer, you'll architect and build the core AI agents and infrastructure that power precision outbound at scale — then make them accessible through beautiful, intuitive interfaces. You'll work directly with customers, shape product direction, and own critical systems that drive revenue for 40+ YC companies and growing. What You'll Build AI agents that discover hyper-targeted leads by understanding ideal customer profiles, conference attendees, hiring signals, and more. Real-time content monitoring systems that track what prospects are posting, sharing, and engaging with across social platforms. Multi-channel sequence orchestration across email and LinkedIn, managing dozens of email domains and sender accounts. Enterprise-grade infrastructure that scales to hundreds of concurrent users — multi-tenant architecture with role-based access control, end-to-end encryption, SOC 2-ready audit logging, and rate limiting built in from day one. Polished user interfaces that turn complex outbound workflows into experiences sales teams can set up in minutes. We're Looking For 1–4 years of experience building production systems and user-facing features. Full-stack expertise — strong with TypeScript, React, Next.js, and Python. Systems thinking — you understand distributed systems, concurrency, and performance optimization. Product mindset — you talk to customers, understand their pain, and ship solutions that solve real problems. High agency — you identify problems and fix them without being asked. Bonus Points Experience with AI/ML, particularly LLMs, prompt engineering, or building AI agents. Previous startup experience or experience building successful B2B SaaS products. Design sense — you can build UIs that don't just work but feel great to use.

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