Software Engineer, AI Agents ($125k-$175k + Equity) at Reacher

About the role

Join a five-person engineering team as a founding specialist in AI agents. You will design and deploy autonomous systems that handle discovery, negotiation, and campaign management for TikTok Shop brands. This role involves building long-running, stateful workflows from scratch, taking full ownership of backend infrastructure and orchestration in a fast-paced San Francisco-based environment.

Why this role is remarkable

• Work directly with founders in San Francisco as one of the first five engineers, shaping the technical architecture of the company's most strategic long-term bet.
• Join a high-growth startup (YC S25) that has already achieved 7-figure ARR and counts world-class operators like Steve Huffman and Matteo Franceschetti as investors.
• Move beyond simple API calls to build true autonomous agents featuring complex orchestration, state management, and error recovery for massive e-commerce workflows.

What you will do

• Build and own end-to-end long-running AI agents that automate multi-step affiliate marketing workflows, from creator discovery to performance tracking.
• Design and maintain the core backend infrastructure using Python, FastAPI, and GCP, ensuring agent reliability through advanced observability and error recovery systems.
• Collaborate on agentic system design, leveraging Claude Code and context engineering to decompose complex engineering tasks into autonomous actions.

Requirements

• 3+ years of backend engineering experience, specifically building complex asynchronous systems, automation, or AI-driven pipelines at a product-first company.
• Deep technical proficiency in Python, FastAPI, and PostgreSQL, with the ability to manage cloud infrastructure on GKE or KEDA.
• Demonstrates an ownership mindset and resourcefulness, capable of translating vague product requirements into production-ready code without significant hand-holding.

Pay

$125k-$175k + Equity

Location

San Francisco, USA