Software Engineer

Software Engineer, AI Agents About Reacher We're the #1 TikTok Shop partner helping brands like Under Armour, Hanes, HeyDude, and Logitech scale their affiliate marketing. We've crossed 7 figures in ARR and are backed byY Combinator, Pioneer Fund, Rebel Fund, and operators including Steve Huffman (CEO of Reddit), Matteo Franceschetti (CEO of Eight Sleep), Theo Browne (t3.gg). We're making a big bet on AI agents and what they can do for creator marketing. This role sits at the center of that. What You'll Do AI AgentsBuild and own long-running AI agents that automate complex, multi-step workflows for TikTok Shop brands.Design agentic systems end-to-end: orchestration, state management, error recovery, and observability. Backend & InfrastructureOwn the backend systems your agents run on - design, implement, ship, maintain. Python, FastAPI, PostgreSQL, GCP.Contribute to our jobs infrastructure (GKE-based, on-demand workers) as needed to support agent reliability and scale.Set the bar for code quality and architecture decisions across the backend. You're a Fit If3+ years of backend engineering experience, ideally at a product-first companyYou've built automation, agents, or complex async systems - and you think deeply about failure modesStrong systems thinking, but applied toward agent reliability and workflow design, not just raw infraComfortable with ambiguity and own problems end-to-end without hand-holdingYou've worked directly with customers or product teams and can translate vague requirements into technical decisionsResourceful: you figure things out, you don't wait for the answer to show up Technical Skills We Value AI and Agentic Development: AI agent frameworks and LLM orchestration for building and managing long-running, multi-step agentsClaude Code proficiency: context engineering (CLAUDE.md), custom commands, MCP integrations, subagent coordinationStrong judgment for when to leverage AI vs. when to code directlyAbility to decompose complex engineering work into tasks suitable for AI assistanceExperience verifying AI-generated code for correctness, security, and maintainabilityBackend: Python, FastAPI, PostgreSQLSystem design with a focus on async, long-running, stateful workflowsGCP/cloud infrastructure (GKE/KEDA) - enough to own what your agents needAPI design (REST/GraphQL)General: Testing frameworks (Playwright, Pytest) - especially for validating agent behavior end-to-endCode reviews, documentation, and establishing conventionsBonus PointsYou've been an early engineering hire at a startupYou've built or maintained internal automation systems that ran at scaleYou've worked on AI agents, LLM pipelines, or autonomous systemsYou've shipped side projects or contributed to open sourceYou're curious about e-commerce, creator marketing, or what AI will do to the agency business Why JoinSmall team (5 engineers), high ownership - you're working on the hardest problems, not feature ticketsYou'll work closely with the founders in SF on the longest-term bets in the companyReal equity, we care about it as much as salary Location On-site in San Francisco. This role is meant to be close to the founding team. When Applying Send a short note about something you've built and why this role excites you. GitHub, LinkedIn, resume all welcome, but I care more about how you think and what you've shipped.