Full Stack Software Engineer ($200K - $300K + Equity) at SellScale

Jack & Jill/External ATS • San Fransisco, CA

5d • $200,000 - $300,000 • Onsite

About The Position

Join a high-intensity team as a founding engineer building Selix, an AI agent automating outbound sales. You will own features end-to-end across the full stack, transitioning between complex SaaS integrations and cutting-edge LLM infrastructure. This is a rare opportunity to shape the product and culture of a company solving a massive market problem.

Requirements

• 2-5 years of professional experience at high-growth startups with a track record of shipping production-grade code.
• Deep technical proficiency in the stack: React, TypeScript, Python, and SQL database management.
• Entrepreneurial mindset ready for a high-velocity, in-office San Francisco environment as a founding team member.

Responsibilities

• Develop and deploy end-to-end features using React/TypeScript on the frontend and Python on the backend.
• Architect and scale AI agent infrastructure that utilizes chained LLM thinking and vector databases.
• Collaborate directly with the founders to translate customer needs into production-ready agentic workflows.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed