Founding Engineer

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.

Responsibilities

• 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.

Requirements

• 1–6 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.
• 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.

Qualifications

• Significant equity in a fast-growing company backed by Y Combinator.
• Direct customer impact — your code powers outbound for dozens of high-growth startups.
• Work closely with 2x YC founders (Harvard/MIT CS) who've built and sold before.

Skills

• Strong TypeScript, React, Next.js, and Python skills.
• Understanding of distributed systems, concurrency, and performance optimization.
• Experience with AI/ML, particularly LLMs, prompt engineering, or building AI agents.
• Experience with full-stack development and building user-facing features.
• Experience with enterprise-grade infrastructure and multi-tenant architectures.
• Experience with design and creating polished user interfaces.

Benefits

• Competitive compensation — $200K–$250K base salary plus equity.
• Full benefits — health, dental, vision, unlimited PTO.
• San Francisco office — collaborate in-person with the team.

Pay

$200K - $250K base salary

Schedule

Full-time