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

About the Company

Reacher is a YC S25-backed platform and the #1 TikTok Shop partner helping global brands like Under Armour and Logitech scale affiliate marketing. Having crossed seven figures in ARR, they are backed by the Pioneer Fund, Rebel Fund, and founders of Reddit and Eight Sleep to automate the creator economy.

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.

Ideal Candidate

• Brings 3+ years of backend engineering experience, specifically building complex asynchronous systems, automation, or AI-driven pipelines at a product-first company.
• Possesses 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