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.
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San Francisco, USA$200K - $300K + Equity
Featured roleSan Francisco, USA$200K - $300K + Equity
Full Stack Software Engineer at SellScale — AI Agent Startup
Most AI agents today are built for engineers, but 99% of the world doesn't code. SellScale is changing that by building the first agentic sales org, starting with their autonomous agent, Selix. Backed by Pear VC and leaders from Notion and Figma, they are looking for a Founding Full Stack Engineer in SF to own the product end-to-end. With $200k-$300k base salary and up to 3% equity, this is a high-stakes opportunity to build at the forefront of the agentic AI boom. If you're a Python/React expert ready to move at startup speed, this is your seat at the table.
Overview
Why this role stands out
Company
SellScale - Pear VC-backed startup building the first agentic sales org
Responsibilities
What you will do
- 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.
Candidate profile
Who this is a fit for
- 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.
What makes it remarkable
Why this role is remarkable
- Exceptional ownership with a 1-3% equity grant, offering true founding-level upside rarely seen at this stage.
- Backed by elite investors including Pear VC, Ovo Fund, and angels from Notion, Figma, and Dropbox.
- Build for the "99%" by creating sophisticated AI agents for non-technical users in the massive sales software market.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
About Jack & Jill
Meet Jack
Jack gets to know what you are great at, what you want next, and makes sure Jill considers you for the right opportunities.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
Jack